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Hydrogen is currently considered to be the best clean energy to replace fossil fuels, so hydrogen leak detection is crucial. The current research field of hydrogen sensors focuses on the discovery and optimization of sensitive materials. ZnFe 2 O 4 powder is prepared by the sol-gel method and sintered at different temperatures. The effects of sintering temperature on electrode morphology and hydrogen sensing performance are investigated. The sensitivity reaches a maximum value of −101.32 mV/decade at the sintering temperature of 1100 °C. The sensor has different sensing performance at different operating temperatures. It has the best response value and sensitivity at 450 °C, and the best response/recovery rate and response curve stability at 550 °C. The sensor responds and recovers in seconds. The material has good H 2 selectivity and is suitable for potentiometric hydrogen sensors. CO, NH 3 , and CH 4 have less effect on the response signal and exhibit good long-term stability. • Spinel ferrite is first used as an H 2 detection electrode for potentiometric sensors. • ZnFe 2 O 4 has high response value and sensitivity to hydrogen gas. • ZnFe 2 O 4 has a low detection limit and fast response/recovery rate for hydrogen gas. [ABSTRACT FROM AUTHOR]

Abstract The most rapidly expanding type of solar cells are the Perovskite Solar Cells (PSCs), because of its high device performance, ease of synthesis, high open-circuit voltage, and affordability. Despite these advantages, the development of perovskite-based solar cells continues to be impeded by the issues with perovskite stability and the utilization of the hazardous heavy element lead (Pb). The study emphasizes on the bifacial structure that maintains the conventional absorber layer and electron transport layer (ETL) in the optimized PSC structure. This study employs SCAPS software for device simulation to comprehensively analyze how various parameters affect the performance of solar cells. Additionally, doping concentration variation in both ETL and HTL are explored. The simulation reveals that changing device structure from monofacial to bifacial significantly influences PSC performance, demonstrating that optimizing individual layers effectively enhances overall solar cell performance. The optimized structure achieves impressive PSC performance metrics through parametric analysis, such as voltage (VOC) of 1.18 V, fill factor (FF) of 82.24%, current density (JSC) of 27.12 mA/cm2, power conversion efficiency (PCE) of 27.90% for an incident solar spectrum from the ETL side, and power conversion efficiency (PCE) of 19.86% for an incident solar spectrum from the HTL side, the calculated bifaciality factor (BF) for this structure is 71.18%.

This work studies the performance of solar cells composed of two different materials, graphene oxide (Go, hole transport material) and zirconium disulfide (ZrS2, electron transport materials) using the SCPAS -1D simulation. It has been found that Go/ZrS2 solar cells show better performance with high short circuit current, Jsc, of 38 mA/cm2 and the power conversion efficiency, η, of 17% compared with other solar cells based on graphene oxide and perovskite materials. Additionally, the short circuit current density decreases from 38 mA/cm2 to 22 mA/cm2 when the energy gap of ZrS2 increases from 1.2 eV to 17 eV. The increasing the operating temperature and the work function of back contact also led to decrease the open circuit voltage and power conversion efficiency of the cells, while the short circuit current density was slightly enhanced. That is attributed to changes in the electrical properties of Go and ZrS2 layers, including their charge carrier mobility and characteristics of the interfacial layers.

After hydrogen production, it can storage and compression for transportation is critical process. In this regard, the electrochemical hydrogen compressor, which allows simultaneous purification and compression of hydrogen, has attracted great attention in recent years. In this study, the compression performance of a single-cell electrochemical hydrogen compressor at different temperature values was investigated. Accordingly, experiments were carried out under low (50–80 °C) and high (120–180 °C) temperature conditions. The optimal polarization curve for electrochemical hydrogen compressors was reached 70 °C at low temperatures and 160 °C at high temperatures. Furthermore, increasing the cell voltage decreases compression time and improves performance. A high compression ratio was achieved at 0.8 V cell voltage. At this voltage, different times are needed at low and high temperatures to compress the hydrogen in the cathode up to 5 bar. Finally, based on the single-cell system's testing results, the stack cell can attain superior compression values. • Variation of cell temperature affects EHC performance. • The ideal compression value was reached at 70 °C and 160 °C temperatures. • The effects on EHC of some major parameters are revealed. • The cell reached the maximum cathode pressure at 0.8 V. • Data provides the basis for the development of stack EHC systems. [ABSTRACT FROM AUTHOR]

Ion conducting membranes play a crucial role in redox flow batteries, separating anolyte and catholyte while allowing proton transport to complete the circuit. However, most membranes are trapped in a trade‐off relation and show either low conductivity or high vanadium crossover. This study investigates the use of dense sulfonated para‐polybenzimidazole membranes for vanadium redox flow batteries (VRFBs), and analyzes the effects of membrane preparation process, membrane thickness and operating temperature on the VRFB performance. The results demonstrate superior performance of VRFBs utilizing fluorine‐free sulfonated para‐polybenzimidazole membranes compared to other types. Under optimal conditions, the VRFB exhibits high coulombic efficiency (>99%) and high energy efficiency (EE, 92.2% at a current density of 80 mA cm−2), and durability. The achieved EE represents one of the highest reported in the literature for VRFBs. In addition, it is shown that operation at 35 °C has benefits at high current densities (EE at 300 mA cm−2 is over 80% at 35 °C but 72% at 25 °C), while the operation at 80 mA cm−2 only shows a small temperature effect (91.8 and 92.2%, respectively). [ABSTRACT FROM AUTHOR]

Co_3 O_4 metal oxide semiconductor is in principle suitable material for utilization as a resistive gas sensor. In this research, nanostructure cobalt oxide thin films were prepared by chemical spraying pyrolysis technique, by dissolving cobalt chloride with distilled water. The films were doped with Cerium Ce in different concentrations, and the structural and morphology properties of the samples were studied. A gas sensor was prepared from doped and undoped cobalt oxide material. The response properties were studied and the operating temperature and response time of the manufactured sensor were found, the effect of doping on the sensor properties was studied. [ABSTRACT FROM AUTHOR]

The most rapidly expanding type of solar cells are the Perovskite Solar Cells (PSCs), because of its high device performance, ease of synthesis, high open-circuit voltage, and affordability. Despite these advantages, the development of perovskite-based solar cells continues to be impeded by the issues with perovskite stability and the utilization of the hazardous heavy element lead (Pb). The study emphasizes on the bifacial structure that maintains the conventional absorber layer and electron transport layer (ETL) in the optimized PSC structure. This study employs SCAPS software for device simulation to comprehensively analyze how various parameters affect the performance of solar cells. Additionally, doping concentration variation in both ETL and HTL are explored. The simulation reveals that changing device structure from monofacial to bifacial significantly influences PSC performance, demonstrating that optimizing individual layers effectively enhances overall solar cell performance. The optimized structure achieves impressive PSC performance metrics through parametric analysis, such as voltage (VOC) of 1.18 V, fill factor (FF) of 82.24%, current density (JSC) of 27.12 mA/cm2, power conversion efficiency (PCE) of 27.90% for an incident solar spectrum from the ETL side, and power conversion efficiency (PCE) of 19.86% for an incident solar spectrum from the HTL side, the calculated bifaciality factor (BF) for this structure is 71.18%. [ABSTRACT FROM AUTHOR]

In order to study the effects of temperature and humidity on the performance of proton exchange membrane fuel cell (PEMFC), a temperature and relative humidity-current (TRH-C) model was proposed. The model took the water flow and membrane water content of anode and cathode flow channels into consideration, and revealed the law of current density distribution and membrane water content distribution under the condition of current step change. According to the real flow channel configuration of the experimental single cell, a simplified PEMFC geometric model was established and the calculation grid was divided, and the TRH-C model was coupled to the multi-physical field calculation software COMSOL. A PEMFC test platform was established to test PEMFC under different temperature and humidity conditions. The operating temperatures of PEMFC were 65 °C and 70 °C, and the inlet humidities were 50% and 75%. The polarization curve, the membrane current density, and the membrane water content under different working conditions were analyzed and discussed. The results show that the TRH-C model can accurately predict the output performance of PEMFC. When the operating temperature is 70 °C, the inlet humidity is 50%, and the current density is 0. 018 A/cm², the relative errors of the TRH-C model of voltage and power density both reach the maximum value, which are 7.306% and 8.837%, respectively. The performance of PEMFC can be improved by increasing operating temperature and inlet air humidity. As the operating temperature increases, the distribution uniformity of membrane current density fluctuates and the mem-brane water content decreases. With the increase of inlet air humidity, the film current density distribution becomes more uniform and the film water content increases. This work provides a new theoretical method for optimizing inlet air strategy control and improving the output performance. [ABSTRACT FROM AUTHOR]

This work studies the performance of solar cells composed of two different materials, graphene oxide (Go, hole transport material) and zirconium disulfide (ZrS2, electron transport materials) using the SCAPS -1D simulation. It has been found that Go/ZrS2 solar cells show better performance with high short circuit current, Jsc, of 38 mA/cm2 and the power conversion efficiency, η, of 17% compared with other solar cells based on graphene oxide and perovskite materials. Additionally, the short circuit current density decreases from 38 mA/cm2 to 22 mA/cm2 when the energy gap of ZrS2 increases from 1.2 eV to 17 eV. The increasing the operating temperature and the work function of back contact also led to decrease the open circuit voltage and power conversion efficiency of the cells, while the short circuit current density was slightly enhanced. That is attributed to changes in the electrical properties of Go and ZrS2 layers, including their charge carrier mobility and characteristics of the interfacial layers. [ABSTRACT FROM AUTHOR]

Metal-oxide-semiconductors (MOS) gas sensors are widely used for detecting and measuring the concentration of various gases in different applications. Changing the electrical resistance when the MOS surface reacts with a specific gas is the basis of the operation of the gas sensor of MOS. They offer versatility in detecting various gases and fabricating them suitable for supervising energy efficiency, monitoring health and safety, and controlling hazardous emissions. However, traditional MOS sensors suffer from poor selectivity and usually require high operating temperatures. To overcome these limitations, researchers have explored strategies such as doping, bimetallic/co-doping, and composite structures with conductive polymers and 2D materials such as polyaniline (PANI), polymethyl methacrylate (PMMA), polyvinyl alcohol (PVA), reduced graphene oxide (rGO), graphitic carbon nitride (g-C3N4), and graphene. Among the 2D materials, g-C3N4 stands out due to its distinct characteristics, including chemical stability, porosity structure, abundance, lack of toxicity, and numerous surface defects. The exfoliated structure and surface defects of g-C3N4 provide active sites for adsorbing atmospheric oxygen and facilitating reactions with specific gas molecules. This review introduces MOS gas sensors, covering their fabrication methods and electrical measurements. It then attentions on the properties of g-C3N4, synthesis methods, and its potential for composition with the MOS. The review highlights the enhanced gas sensing performance achieved by MOS/g-C3N4 nanocomposites to detect different gases.

Aviation soot constitutes a significant threat to human well-being, underscoring the critical importance of accurate measurements. The condensation particle counter (CPC) is the primary instrument for quantifying aviation soot, with detection efficiency being a crucial parameter. The properties of small particles and the symmetry of their growth pathways are closely related to the detection efficiency of the CPC. In laboratory environments, sodium chloride is conventionally utilized to calibrate the CPC's detection efficiency. However, aviation soot exhibits distinctive morphological characteristics compared to the calibration particles, leading to detection efficiencies obtained from calibration particles that may not be applicable to aviation soot. To address this issue, a quantitative study was performed to explore the detection efficiency deviations between aviation soot and calibration particles. The experiment initially utilized a differential mobility analyzer to size select the two types of polydisperse particles into monodisperse particles. Subsequently, measurements of the separated particles were performed using the TSI Corporation's aerosol electrometer and a rigorously validated CPC (BH-CPC). These allowed for determining the detection efficiency deviation in the BH-CPC for the two types of particles at different particle sizes. Furthermore, the influence of the operating temperature of the BH-CPC on this detection efficiency deviation was investigated. The experimental results indicate a significant detection efficiency deviation between aviation soot and sodium chloride. In the range of 10–40 nm, the absolute detection efficiency deviation can reach a maximum of 0.15, and the relative deviation can reach a maximum of 0.75. And this detection efficiency deviation can be reduced by establishing a relevant relationship between the detection efficiency of the operating temperature and the calibration temperature. Compared to the saturated segment calibration temperature of 50 °C, the aviation soot detection efficiency is closer to the sodium chloride detection efficiency at the calibration temperature of 50 °C when the saturated segment operates at a temperature of 45 °C. These studies provide crucial theoretical guidance for enhancing the precision of aviation soot emission detection and establish a foundation for future research in monitoring and controlling soot emissions within the aviation sector. [ABSTRACT FROM AUTHOR]

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Polymer-dispersed liquid crystal (PDLC) films are electrically controlled dimming films. By applying an electric field to the PDLC film, it becomes transparent, whereas in the absence of an electric field, the PDLC film is opaque. In recent years, with the development of new-energy vehicles, the utilisation of glass curtains instead of the conventional skylight or sunshade has become a trend, because the combination of PDLC films and glass can realise random switching between shading and transparency; thus, it has great application prospects in the automotive industry. However, the low operating temperature of PDLC films limits their application. In this study, a characterisation method for PDLC film performance at high temperatures is discussed, and the effect of SiO2 microspheres on the high-temperature properties of PDLC films is investigated. When the proportion of doped SiO2 was 1.5%, the maximum operating temperature reached 95°C, and the light transmittance and hazeon (power on) did not change compared with the PDLC film without doped SiO2. The utilisation of the power-off haze at high temperature as a performance index of PDLC films has universal significance for the evaluation of the high-temperature resistance of these materials. [ABSTRACT FROM AUTHOR]

This paper presents a mathematical model for stacks of direct methanol fuel cells (DMFCs) using an optimised method. In order to reduce the sum of squared errors (SSE) in calculating the polarisation profile, the suggested technique makes use of simulated experimental data. Given that DMFC is one of the viable fuel cell choices, developing an appropriate model is essential for cost reduction. However, resolving this issue has proven difficult due to its complex and highly nonlinear character, particularly when adjusting the DMFC model to various operating temperatures. By combining the algorithm and the objective function, the current work introduces a novel method called LSHADE (ELSHADE) for determining the parameters of the DMFC model. This technique seeks to accurately identify DMFCs' characteristics. The ELSHADE method consists of two stages, the first of which is controlled by a reliable mutation process and the latter by a chaotic approach. The study also recommends an improved Newton–Raphson (INR) approach to deal with the chaotic nature of the I-V curve equation. The findings show that, when used on actual experimental data, the ELSHADE-INR technique outperforms existing algorithms in a variety of statistical metrics for accurately identifying global solutions. [ABSTRACT FROM AUTHOR]

Aviation soot constitutes a significant threat to human well-being, underscoring the critical importance of accurate measurements. The condensation particle counter (CPC) is the primary instrument for quantifying aviation soot, with detection efficiency being a crucial parameter. The properties of small particles and the symmetry of their growth pathways are closely related to the detection efficiency of the CPC. In laboratory environments, sodium chloride is conventionally utilized to calibrate the CPC’s detection efficiency. However, aviation soot exhibits distinctive morphological characteristics compared to the calibration particles, leading to detection efficiencies obtained from calibration particles that may not be applicable to aviation soot. To address this issue, a quantitative study was performed to explore the detection efficiency deviations between aviation soot and calibration particles. The experiment initially utilized a differential mobility analyzer to size select the two types of polydisperse particles into monodisperse particles. Subsequently, measurements of the separated particles were performed using the TSI Corporation’s aerosol electrometer and a rigorously validated CPC (BH-CPC). These allowed for determining the detection efficiency deviation in the BH-CPC for the two types of particles at different particle sizes. Furthermore, the influence of the operating temperature of the BH-CPC on this detection efficiency deviation was investigated. The experimental results indicate a significant detection efficiency deviation between aviation soot and sodium chloride. In the range of 10–40 nm, the absolute detection efficiency deviation can reach a maximum of 0.15, and the relative deviation can reach a maximum of 0.75. And this detection efficiency deviation can be reduced by establishing a relevant relationship between the detection efficiency of the operating temperature and the calibration temperature. Compared to the saturated segment calibration temperature of 50 °C, the aviation soot detection efficiency is closer to the sodium chloride detection efficiency at the calibration temperature of 50 °C when the saturated segment operates at a temperature of 45 °C. These studies provide crucial theoretical guidance for enhancing the precision of aviation soot emission detection and establish a foundation for future research in monitoring and controlling soot emissions within the aviation sector.

Floating photovoltaics (FPV) is rapidly emerging as a promising alternative to ground-mounted PV (GPV) where available land area is scarce or expensive. Improved cooling has often been reported as a benefit of FPV, as cell temperature is an important parameter for the performance of a PV system. However, more recent literature shows that the cooling effect depends strongly on FPV technology and that it is not always superior to that of open rack GPV systems. There is still a need for more information on how to estimate cell temperatures for FPV systems, and how to consider the influence of various environmental factors such as wind speed and direction. Operating cell temperature may be estimated with the PVsyst model, where heat loss coefficients (U-values) denote the heat transfer capabilities of the PV system. In this work, cell temperatures and U-values for a small footprint FPV system with east-west orientation and a 15° tilt located in Sri Lanka are studied using both module temperature measurements and computational fluid dynamics (CFD) modelling. CFD modelling allows for investigating the influence of both wind speed and direction on cell temperatures, as well as to look at the distribution of cell temperatures within the system under different wind conditions. Calculations based on measurements give Uc = 22.6 W/m2K and Uv = 4.9 Ws/m3K and correlate well with CFD calculations. We also show that wind direction, system configuration and sensor placement influence the estimated U-values, complicating the use of tabulated values for any given technology.

Direct carbon solid oxide fuel cells (DC-SOFCs) offer the potential for clean and efficient conversion of chemical energy in carbon fuels into electricity. However, the reverse Boudouard gasification of carbon requires a high operating temperature (≥800 °C), which hinders the development of DC-SOFCs. We present a completely sealed DC-SOFC with in situ steam-carbon gasification. The cells have a symmetrical cell structure (Ag–Ce 0.8 Gd 0.2 O 1.9 /La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 3−δ /Ag–Ce 0.8 Gd 0.2 O 1.9) and are loaded with K-loaded activated carbon fuel. Ca(OH) 2 and Li 4 SiO 4 are loaded into the anode chamber as the steam feedstock and CO 2 sorbent, respectively. Completely sealed DC-SOFCs with Ca(OH) 2 –C of 0 %, 5 %, 10 %, 15 %, and 20 % have been tested at 700 °C. Compared with a cell with a conventional structure and a completely sealed cell without Ca(OH) 2 loading, the electrochemical performances of all the completely sealed cells with Ca(OH) 2 loading are significantly enhanced. The cell with Ca(OH) 2 to C of 15 % obtained the highest maximum power density of 75 mW cm−2, which is approximately two-fold that of the conventional DC-SOFC. The mechanism for improving the performance of the cell is the introduction of steam. This study offers a new method to develop high-performance DC-SOFCs and reduce their operating temperatures. • A completely sealed DC-SOFC with in situ steam-carbon gasification is developed. • Ca(OH) 2 and Li 4 SiO 4 are the steam feedstock and CO 2 sorbent, respectively. • Electrochemical performance significantly enhanced at low temperatures. [ABSTRACT FROM AUTHOR]

Ammonia is a promising carbon-free fuel for solid oxide fuel cells (SOFCs). However, direct feeding of ammonia into the SOFC may lead to serious degradation due to the nitriding. Conversely, the pre-cracking of ammonia introduces complexity to the system design and causes increased power losses in the system. Therefore, it is crucial to explore all these aspects simultaneously. In this context, this study introduces a novel multiscale modeling approach by integrating a 3D multiphysics simulation of the ammonia-fueled SOFC stack with system-level modeling to investigate the reliability and performance of the stack and system. Two different cell technologies developed for low temperature (LT) and high temperature (HT) operation are investigated at LT (600 – 700 ° C) and HT (700 – 800 ° C) ranges. The results indicate that fuel inlet temperature should be 55 ° C and 18 ° C higher than the minimum temperature in 0% pre-cracking case for HT and LT cases, respectively. The increase in the required air flow rate for cooling in the 100% pre-cracking case compared to the 0% pre-cracking case is around 100% and 216% for the HT and LT cases, respectively. However, stack power production and power losses in the system components are comparable for LT and HT cases which leads to similar system performance. A larger share of the active area is affected by nitriding in LT cases than HT ones. However, a smaller cracking ratio at LT (∼ 82%) compared to HT conditions (∼ 92%) is needed for elimination of nitriding. While the LT and HT cases are comparable in terms of system power production, the lower stack outlet temperatures in LT cases require novel and more expensive catalysts for ammonia pre-cracking and HT cases need more expensive steels. • A multiscale multiphysics modeling approach of ammonia-fueled SOFCs is developed. • Two cell technologies developed for low and high temperature operation are compared. • Inlet temperature and air flow rate should be adjusted to control stack temperature. • Both low and high temperature SOFC stacks need pre-cracking to avoid nitriding. • Systems working with low and high temperature cells have comparable performances. [ABSTRACT FROM AUTHOR]

An all-solid-state fluoride-ion battery (FIB) is one of the promising candidates for the next-generation battery owing to its high energy density and high safety. For the practical application of FIBs, it is an urgent task to operate FIBs at lower temperatures. However, there are still two major difficulties in conventional conversion-type pure metal cathodes: low F - ion conductivities and poor cycle stabilities. Here, the conversion-type Sn-based intermetallic alloy is proposed as a new cathode that can overcome the above issues. The present CoSn 2 cathode retains the discharge capacity of 229 mAh g -1 after 250 cycles, even at 60 °C. CoSn 2 is decomposed into CoF 2 and SnF 2 nanocrystals in the charging process, and the nanoscale network structure of SnF 2 provides the fast F - ion conduction path throughout the cathode, facilitating the battery operation at lower temperatures. Moreover, the formed CoF 2 and SnF 2 phases are merged into the original CoSn 2 phase in the discharging process, leading to a highly reversible redox reaction and the high cycle stability of CoSn 2 . These findings should pave the way to enhance the performance of all-solid-state FIBs at lower temperatures., (© 2024 Wiley‐VCH GmbH.)

Organic thin-film transistor (OTFT) has been adopted as a promising sensing platform to detect DNA target molecules by analyzing their electrical parameters. The source/drain current ratio of OTFT (with and without DNA molecules) as the sensor sensitivity have been widely utilized to detect and identify DNA molecules. In this paper, pentacene as a typical organic semiconductor with various thin-film thicknesses have been adopted as the active layer of OTFT that induce to the changeable sensor sensitivity for the DNA molecules. Importantly, the sensitivity of the device shows the remarkable dependence in the applied gate voltages (V G) and an improved trend is observed with the lowering of V G. Importantly, a ten-fold improvement in the sensor sensitivity is achieved by the optimization of channel thicknesses at the low V G condition. Furthermore, the variable-temperature measurements are carried out to explore the charge mechanism of OTFT induced by the DNA molecules. Our studies indicate the sensor sensitivity is mainly determined by the charge-injection process of OTFT arisen in the linear region. Current work will be helpful for deeply understanding the operating mechanism of OTFT-based biosensors. [Display omitted] • Sensor sensitivity improved by adjusting channel thickness and gate voltage. • Novel insights into charge transport in OTFTs influenced by DNA immobilization. • Introduction of variable-temperature measurements to assess sensor performance. • Analysis of DNA's role in altering charge transport and enhancing sensor efficiency. [ABSTRACT FROM AUTHOR]

• Impact of temperature on binary electrolyte-based Li-O2 battery is investigated. • Binary electrolyte comprises of room temperature ionic liquid and organic solvent. • Viscosity, ionic conductivity, reaction, and evaporation rates are also studied. • Binary electrolyte outperforms pure electrolytes at all operating temperatures. Awaiting a breakthrough, the Li-oxygen battery (LOB) is considered a promising candidate to meet the high energy demands in the future. Among various critical challenges which hamper its development, the mystery of the electrolyte with optimal properties remains unsolved to this day. In this study, we comprehensively investigated the effects of operating temperature (20C, 40 °C and 60 °C) on the electrochemical performance of LOBs incorporated with room temperature ionic liquid (RTIL) and organic solvent binary electrolyte. We designed and investigated 1-Ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C 2 C 1 im ][Tf 2 N]) RTIL and dimethyl sulfoxide (DMSO) organic solvent at various volume ratios ((4:1), (1:1), (1:4)). Among the binary electrolytes, ([C 2 C 1 im ][Tf 2 N]/DMSO (1:4)) delivered the highest discharge capacities of 3.70 Ah g − 1 (20 °C), 4.0 Ah g − 1 (40 °C) and 3.65 Ah g − 1 (60 °C) as compared with pure [C 2 C 1 im][Tf 2 N] and DMSO. Cycling stability tests showed superior stability of the binary electrolyte ([C 2 C 1 im ][Tf 2 N]/DMSO (1:4)) irrespective of the operating temperature. From viscosity and ionic conductivity measurements (at 20–60 °C), [C 2 C 1 im][T f 2 N]/DMSO (1:4) exhibited the highest ionic conductivity and the lowest viscosity compared with other binary electrolytes (even with pure electrolytes) at any given temperature. Cyclic voltammetry (CV) tests revealed the highest reaction rates for [C 2 C 1 im][T f 2 N]/DMSO (1:4) binary electrolytes than pure electrolytes. The superior performance of [C 2 C 1 im][T f 2 N]/DMSO (1:4) binary electrolyte was ascribed to enhanced stability against reactive intermediate species during oxygen reduction reaction (ORR), increased ionic conductivity, low viscosity (comparable with organic electrolytes), improved oxygen solubility, and relatively low evaporation rates. [ABSTRACT FROM AUTHOR]