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In this work, flexible Cu2−xS films on nylon membranes are prepared by combining a simple hydrothermal synthesis and vacuum filtration followed by hot pressing. The films consist of Cu2S and Cu1.96S two phases with grain sizes from nano to submicron. Doping Se on the S site not only increases the Cu1.96S content in the Cu2−xS to increase carrier concentration but also modifies electronic structure, thereby greatly improves the electrical properties of the Cu2−xS. Specifically, an optimal composite film with a nominal composition of Cu2−xS0.98Se0.02 exhibits a high power factor of ~150.1 μW m−1 K−2 at 300 K, which increases by ~138% compared to that of the pristine Cu2−xS film. Meanwhile, the composite film shows outstanding flexibility (~97.2% of the original electrical conductivity is maintained after 1500 bending cycles with a bending radius of 4 mm). A four-leg flexible thermoelectric (TE) generator assembled with the optimal film generates a maximum power of 329.6 nW (corresponding power density of 1.70 W m−2) at a temperature difference of 31.1 K. This work provides a simple route to the preparation of high TE performance Cu2−xS-based films. [ABSTRACT FROM AUTHOR]

Thermoelectric (TE) fibers are more suitable than films for portable or wearable devices. Herein, 2–3 nm thick poly (3,4‐ethylenedioxythiophene): poly (styrenesulfonate) (PEDOT:PSS) layer‐coated tellurium nanowires (PC‐Te NWs) are in situ prepared by a hydrothermal method. Then a series of PEDOT: PSS/PC‐Te NWs composite fibers are prepared by wet spinning and post‐treatment. The nanolayer prevents the agglomeration of the Te NWs and makes the NWs and PEDOT:PSS matrix have good compatibility, which results in the PC‐Te NWs content to a high value of 70 wt% and the fibers still with flexibility. The high aspect ratio of the PC‐Te NWs and the stress from the inner wall of the needle during spinning make the NWs ordered align along the composite fiber. Due to the large content and orientational arrangement of the PC‐Te NWs, as well as effective post‐treatment, an optimized composite fiber shows a power factor of 385.4 µW m−1 K−2 at 300 K, which is ≈4.9 times as high as the highest value of previously reported PEDOT:PSS/Te NWs‐based composite fibers. In addition, the composite fiber has good flexibility. The flexible TE generators assembled have excellent output performance. This work provides an effective strategy for the preparation of high‐performance flexible TE composite fibers. [ABSTRACT FROM AUTHOR]

Solid‐state Li metal batteries (SSLMBs) are attractive due to their capability to simultaneously offer high energy density and high‐level safety when combining Li metal anodes, solid‐state electrolytes (SSEs), and high‐voltage cathodes together. However, SSLMBs may well incur short circuits caused by Li dendrites penetrations, which mainly originate from the instability and poor contact between Li metal and SSEs. Herein, by taking full advantage of the reaction products of Li and Li1.3Al0.3Ti1.7(PO4)3 (LATP), a lithium‐LATP composite anode (Li‐LATP) is obtained, in which a stable matrix is formed to enhance the contact between Li and the garnet‐type SSEs, alleviating the volume change and preserving an intact interface during the charge/discharge process. Consequently, the Li‐LATP/garnet/Li‐LATP symmetric cell displays a fairly low interfacial resistance of 6 Ω cm2 and stable cycling performance for over 2500 h with a low overpotential. Furthermore, the LiCoO2/garnet/Li‐LATP full cell also shows a high discharge capacity of 159 mAh g−1 and great cycling performance. [ABSTRACT FROM AUTHOR]

Herein, we develop a facile wet chemical method for the synthesis of Ag 2 Te powders at room temperature and flexible Ag 2 Te/nylon thermoelectric (TE) films are prepared by vacuum-assisted filtration of the synthesized Ag 2 Te powders and then hot pressing. Because of the good crystallinity of Ag 2 Te grains and continuous grain boundaries, an optimized film exhibits a power factor of 513 μW m -1 K -2 at 300 K, which stands among the highest values reported for Ag 2 Te-based films to date. In addition, the film also has good flexibility. A four-leg flexible TE device assembled with the film generates a power density of 5.46 W m -2 at a temperature gradient of 31.8 K. This work provides a facile and environmentally friendly method for preparing flexible Ag 2 Te films.

In this work, flexible Cu 2-x S films on nylon membranes are prepared by combining a simple hydrothermal synthesis and vacuum filtration followed by hot pressing. The films consist of Cu 2 S and Cu 1.96 S two phases with grain sizes from nano to submicron. Doping Se on the S site not only increases the Cu 1.96 S content in the Cu 2-x S to increase carrier concentration but also modifies electronic structure, thereby greatly improves the electrical properties of the Cu 2-x S. Specifically, an optimal composite film with a nominal composition of Cu 2-x S 0.98 Se 0.02 exhibits a high power factor of ~150.1 μW m -1 K -2 at 300 K, which increases by ~138% compared to that of the pristine Cu 2-x S film. Meanwhile, the composite film shows outstanding flexibility (~97.2% of the original electrical conductivity is maintained after 1500 bending cycles with a bending radius of 4 mm). A four-leg flexible thermoelectric (TE) generator assembled with the optimal film generates a maximum power of 329.6 nW (corresponding power density of 1.70 W m -2 ) at a temperature difference of 31.1 K. This work provides a simple route to the preparation of high TE performance Cu 2-x S-based films.

Recent studies have shown that silver selenide is a promising thermoelectric material at room temperature. Herein, flexible films with a nominal composition of (Ag 1- x Cu x ) 2 Se are prepared by a simple and efficient one-pot method combined with vacuum-assisted filtration and hot pressing. The thermoelectric properties of the films are regulated by both cationic doping and a dual-phase strategy via a wet chemical method. As the x increases, not only Cu is doped into the Ag 2 Se, but different new phases (CuAgSe and/or CuSe 2 ) also appear. The (Ag 1- x Cu x ) 2 Se film with x = 0.02 composed of Cu-doped Ag 2 Se and CuAgSe shows a high PF of ∼2540 μW m -1 K -2 ( ZT ∼ 0.90) and outstanding flexibility at room temperature. The high thermoelectric properties of the film are due to the effect of Cu doping and the CuAgSe phase, including the increase in electrical conductivity caused by doping, the enhanced phonon scattering at the Ag 2 Se/CuAgSe interface, and the interaction between the energy filtering effect and the doping effect. In addition to the high output performance (PD max = 28.08 W m -2 , Δ T = 32.2 K), the flexible device assembled with the (Ag 0.98 Cu 0.02 ) 2 Se film also has potential applications as a temperature sensor.

Introducing N atoms in vanadium oxides (VO x ) of aqueous Zn-ion batteries (ZIBs) can reduce their bandgap energy and enhance their electronic conductivity, thereby promoting the diffusion of Zn 2+ . The close-packed vanadium oxynitride (VON) generated often necessitates the intercalation of water molecules for restructuring, rendering it more conducive for zinc ion intercalation. However, its dense structure often causes structural strain and the formation of by-products during this process, resulting in decreased electrochemical performance. Herein, carbon-coated porous V 2 O 3 /VN nanosheets (p-VON@C) are constructed by annealing vanadium metal-organic framework in an ammonia-contained environment. The designed p-VON@C nanosheets are efficiently converted to low-crystalline hydrated N-doped VO x during subsequent activation while maintaining structural stability. This is because the V 2 O 3 /VN heterojunction and abundant oxygen vacancies in p-VON@C alleviate the structural strain during water molecule intercalation, and accelerate the intercalation rate. Carbon coating is beneficial to prevent p-VON@C from sliding or falling off during the activation and cycling process. Profiting from these advantages, the activated p-VON@C cathode delivers a high specific capacity of 518 mAh g -1 at 0.2 A g -1 and maintains a capacity retention rate of 80.9% after 2000 cycles at 10 A g -1 . This work provides a pathway to designing high-quality aqueous ZIB cathodes., (© 2024 Wiley‐VCH GmbH.)

Targeting circular RNA has been a novel approach to preventing and limiting acute myocardial infarction (AMI). Here, we planned to investigate the role and mechanism of circ_0020887 in AMI progression.Hypoxic injury in human cardiomyocytes (AC16) was measured using cell counting kit-8 assay, 5-ethynyl-2'-deoxyuridine assay, flow cytometry, and colorimetric assay kits. RNA and protein expressions were determined using real-time quantitative PCR and western blotting. Direct interplay between RNAs was determined using dual-luciferase reporter, RNA pull-down, and RIP assays.In the plasma and hypoxia-induced AC16 cells of patients with AMI, circ_0020887 and miR-370-3p were upregulated and downregulated, respectively, concomitant with the upregulation of cytochrome P450 1B1 (CYP1B1). Circ_0020887 interference could inhibit hypoxia-induced AC16 cell apoptosis, oxidative stress, and inflammatory response. Circ_0020887 could sponge miR-370-3p, and miR-370-3p could target CYP1B1. The inhibition effect of circ_0020887 knockdown on hypoxia-induced AC16 cell injury could be reversed by the miR-370-3p inhibitor. Besides, CYP1B1 overexpression also overturned the suppressive effect of miR-370-3p on hypoxia-induced AC16 cell apoptosis, oxidative stress, and inflammatory response.In conclusion, circ_0020887 regulated the miR-370-3p/CYP1B1 axis to regulate hypoxia-induced cardiomyocyte injury, confirming that circ_0020887 might promote cardiomyocyte injury.