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Efficient molten salt CO_(2)capture and selective electrochemical transformation processes toward carbon neutrality:advances,challenges,and prospects

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Science China Chemistry 2023年第11期66卷 3116-3135页

作者： Bowen Deng Huayi Yin Kaifa Du Dihua Wang School of Resource and Environmental Sciences Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and EnergyWuhan UniversityWuhan 430072China

Atmospheric carbon dioxide(CO_(2))concentration has reached record levels due to excessive anthropogenic CO_(2)emissions from massive industrial ***-energy-driven CO_(2)electroreduction is an effective method of directly converting CO_(2)into various value-added chemicals or materials without subsequent geological disposal *** to their promising thermal stability,wide electrochemical window,tunable oxo-basicity,and nontoxic nature,molten salt electrolytes endow intrinsic advantages,such as fast CO_(2)absorption and selective electrochemical transformation,among different electrolyte species,wherein advanced carbon materials,CO,and hydrocarbons can be generated at relatively high current ***,we review the recent advances in molten salt CO_(2)capture and electrochemical transformation(MSCC-ET)technologies,including reaction mechanisms,CO_(2)absorption kinetics,electrode reaction kinetics,and product *** review highlights feasible strategies for regulating nanostructures,carbon product crystallinity,energy efficiency,overall CO_(2)conversion efficiency,and MSCC-ET adaptability toward practical flue ***,suitable cost-effective inert anode candidates for the oxygen evolution reaction are discussed.

关键词： carbon dioxide electroreduction CO_(2)capture molten salt electrode reaction energy efficiency

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The j–pH diagram of interfacial reactions involving H+ and OH-

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Journal of Energy Chemistry 2020年第11期29卷 339-343页

作者： Fengjun Yin Hong Liu Chongqing Institute of Green and Intelligent Technology Chinese Academy of SciencesChongqing 400714China Key Laboratory of Reservoir Aquatic Environment Chinese Academy of SciencesChongqing 400714China University of Chinese Academy of Sciences Beijing 100049China

For aqueous interfacial reactions involving H+and OH-, the interfacial pH varies dynamically during the reaction process, which is a key factor determining the reaction performance. Herein, the kinetic relevance between the interfacial pH and reaction rate is deciphered owing to the success in establishing the transport equations of H+/OH- in unbuffered solutions, and is charted as a current(j)–pH diagram in the form of an electrochemical response. The as-described j–pH interplay is experimentally verified by the oxygen reduction and hydrogen evolution reactions. This diagram serves to form a panoramic graphic view of pH function working on the interfacial reactions in conjunction with the Pourbaix’s potential–pH diagram, and particularly enables a kinetic understanding of the transport effect of H+and OH-on the reaction rate and valuable instruction toward associated pH control and buffering manipulation.

关键词： j–pH diagram Interfacial reaction pH gradient H^+and OH^-transports electrode reaction

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electrodeposition of Ir on platinum in NaCl-KCl molten salt

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Transactions of Nonferrous Metals Society of China 2012年第11期22卷 2855-2862页

作者：钱建刚赵天北京航空航天大学化学与环境学院北京100191

The reduction mechanism of Ir in the NaCl-KCl-IrCl3 molten salt was investigated by cyclic voltammetry and chronopotentiometry, and Ir film was deposited effectively on platinum in potentiostatic mode. The morphology and constitution of Ir film were examined by scanning electron microscopy （SEM）, energy dispersive spectroscopy （EDS） and X-ray diffraction （XRD）. It is found that the reduction mechanism of Ir（III） is a three-electron step and electro reaction is a reversible diffusion controlled process; the diffusion coefficients of Ir（III） at 1083, 1113, 1143 and 1183 K are 1.56×10-4, 2.23×10-4, 2.77×10-4 and 4.40×10-4 cm2/s, respectively, while the activation energy of the electrode reaction is 102.95 kJ/mol. The compacted Ir film reveals that the applied potential greatly affects the deposition of Ir, the thickness of Ir film deposited at the potential of reduction peak is the highest, the temperature of the molten salt also exerts an influence on deposition, the film formed at a lower temperature is thinner, but more micropores would occur on film when the temperature went too high.

关键词： Ir NaCl-KCl molten salt NaCl-KCl-IrCl3 molten salt electrodeposition reduction mechanism electrode reaction activation energy micro-pores

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