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10 results on '"Pingchun Guo"'

1. Application of Copper–Sulfur Compound Electrode Materials in Supercapacitors

Author

Junhua Lu, Hedong Jiang, Pingchun Guo, Jiake Li, Hua Zhu, Xueyun Fan, Liqun Huang, Jian Sun, and Yanxiang Wang

Subjects
supercapacitors, copper–sulfur compounds, electrochemical properties, specific capacitance, stability, Organic chemistry, QD241-441
Abstract

Supercapacitors (SCs) are a novel type of energy storage device that exhibit features such as a short charging time, a long service life, excellent temperature characteristics, energy saving, and environmental protection. The capacitance of SCs depends on the electrode materials. Currently, carbon-based materials, transition metal oxides/hydroxides, and conductive polymers are widely used as electrode materials. However, the low specific capacitance of carbon-based materials, high cost of transition metal oxides/hydroxides, and poor cycling performance of conductive polymers as electrodes limit their applications. Copper–sulfur compounds used as electrode materials exhibit excellent electrical conductivity, a wide voltage range, high specific capacitance, diverse structures, and abundant copper reserves, and have been widely studied in catalysis, sensors, supercapacitors, solar cells, and other fields. This review summarizes the application of copper–sulfur compounds in SCs, details the research directions and development strategies of copper–sulfur compounds in SCs, and analyses and summarizes the research hotspots and outlook, so as to provide a reference and guidance for the use of copper–sulfur compounds.

Published
2024
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4. Preparation of rGO/ZnO photoanodes and their DSSCs performance

Author

Jiake Li, Lanxiang Wu, Wentao Li, Ying Chen, Xin Liu, Hedong Jiang, Pingchun Guo, Hua Zhu, and Yanxiang Wang

Subjects
Mechanics of Materials, Mechanical Engineering, General Materials Science, Condensed Matter Physics
Abstract

In this study, we report a mild and controllable preparation method for graphene oxide (GO) and ZnO ultrafine powder, respectively. On this basis, reduced graphene oxide (rGO)/ZnO composite powder for the photoanodes of dye-sensitized solar cells (DSSCs) was synthesized by chemical reduction method. Phase composition, microstructure, chemical structure, conductivity, and specific surface area were examined using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FT-IR), Raman, and Brunauer-Emmett-Teller (BET) method, respectively. Photoelectric performance of DSSCs was studied by the current density-voltage (J-V), electrochemical impedance spectra (EIS) photoelectric test system. As rGO possesses higher adsorption capacity and excellent conductivity, hence it may effectively promote separation of electrons and holes, transmission ability of electrons and holes, and utilization of the light. By contrast, the as-synthesized zinc oxide (ZnO) may increase adsorption capacity of dye molecules, so photoelectric conversion efficiency (PCE) of the solar cells is increased by means of synergistic effects. When adding rGO in the rGO/ZnO composite powder at 1.25 wt%, PCE reaches to 6.27%, an increase of 20.6% more than that of pure ZnO as the photoanode.

Published
2022
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6. Advances in the research of carbon electrodes for perovskite solar cells.

Author

Yaoqiang Gan, Jian Sun, Pingchun Guo, Hedong Jiang, Jiake Li, Hua Zhu, Xueyun Fan, Liqun Huang, and Yanxiang Wang

Subjects
CARBON electrodes, SOLAR cells, CARBON-based materials, CARBON nanotubes, MANUFACTURING processes, PRECIOUS metals
Abstract

Perovskite solar cells (PSCs) were first proposed in 2009. They have the advantages of low cost, a simple manufacturing process and excellent photoelectric performance. PSC electrodes are mainly made from precious metals such as gold and silver. Still, the cost of precious metals is high and they react with the other components of the PSCs, resulting in the poor stability of the photovoltaic device. Using carbon as an electrode material can both reduce the cost and significantly improve the stability of the photovoltaic device. However, the poor interface contact between the carbon electrode and perovskite and carbon electrode resistance results in poor photovoltaic device photoelectric performance. Finding a way to successfully utilize carbon as an alternative electrode material is a key step toward moving PSCs from the laboratory to industrialization. This paper reviews the application of carbon black, graphite, graphene, carbon nanotubes (CNTs) and composite carbon electrode in PSCs, focusing on progress in the research of doping, structure, interface modification and the production process. [ABSTRACT FROM AUTHOR]

Published
2023
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8. Promising application of MOF as composite solid electrolytes via clathrates of ionic liquid

Author

Mengmeng Song, Yanxiang Wang, and Pingchun Guo

Subjects
010405 organic chemistry, Intermolecular force, 010402 general chemistry, Electrochemistry, 01 natural sciences, Chloride, 0104 chemical sciences, Inorganic Chemistry, chemistry.chemical_compound, chemistry, Bromide, Ionic liquid, Materials Chemistry, medicine, Fast ion conductor, Molecule, Ionic conductivity, Physical chemistry, Physical and Theoretical Chemistry, medicine.drug
Abstract

A three-dimensional NbO-type MOF with the formula Cu2(EBTC)(H2O)2·[G] (compound 1) (EBTC4− = 1,1′-ethynebenzene-3,3′,5,5′-tetracarboxylate; G = guest molecules) was synthesized using a solvothermal method. The guest-free framework (2) was obtained by heating methanol-exchanged 1 at 130 °C under vacuum. The [Cu2(EBTC)(H2O)2·(1.5[BMIM]Cl)]∞ (3) and [Cu2(EBTC)(H2O)2·(2.1[EMIM]Br)]∞ (4), belong to IL@MOF, were prepared by the guest-exchange approach using 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) and 1-ethyl-3-methylimidazolium bromide ([EMIM]Br) reside in the pores of 2, respectively. The 3 and 4 show weak intermolecular interactions between the –C C– in the organic linkers and guest molecules and thermally stable up to 230 °C at least. The ionic conductivity value of 3 is about one order of magnitude higher than that of 4 at the same temperature. This study suggested the possibility of promising application of useful MOF as composited solid electrolytes via clathrates of ionic liquid for electrochemical devices.

Published
2019
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