Thermochemical conversion of an MCl2/M (M = Co, Ni, Cu) couple as an index of electrochemical conversion voltage

IF 4.3 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Journal of Physics and Chemistry of Solids Pub Date : 2025-01-27 DOI:10.1016/j.jpcs.2025.112568

Misato Katayama , Asaka Azuma , Sojiro Shibata , Ayaka Kawaguchi , Sota Maegawa , Kanki Hachiuma , Shunki Nakamura , Yoko Urano , Yasuhiro Niwa , Masao Kimura , Yasuhiro Inada

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Abstract

The chemical-state changes in the reduction process of metal chlorides (CoCl₂, NiCl₂, and CuCl₂) supported on SiO₂ were clarified using in situ XAFS measurements. Hydrates were supported in the dried samples prepared by the incipient wetness impregnation, and all metal chlorides changed to anhydrides by heating to 200 °C under an H₂ gas flow diluted by He. Subsequently, CoCl₂ and NiCl₂ were reduced to metallic Co and metallic Ni, respectively, while CuCl₂ was reduced to metallic Cu via CuCl. The temperature at which chloride ions dissociate from anhydrous metal chloride particles was directly determined. In addition, the conversion temperature was determined by in situ XAFS analysis of the process in which metal particles on SiO₂ are oxidized (chlorinated) by the Cl₂ gas diluted by N₂ at elevated temperature. Finally, the thermochemical redox temperature between metal oxides and metals was found to be correlated to their electrochemical conversion voltages. Based on this correlation, the electrochemical conversion voltage was predicted from the thermochemical conversion temperature of the MCl₂/M couple determined in this study.

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来源期刊

Journal of Physics and Chemistry of Solids 工程技术-化学综合

CiteScore

7.80

自引率

2.50%

发文量

605

审稿时长

40 days

期刊介绍： The Journal of Physics and Chemistry of Solids is a well-established international medium for publication of archival research in condensed matter and materials sciences. Areas of interest broadly include experimental and theoretical research on electronic, magnetic, spectroscopic and structural properties as well as the statistical mechanics and thermodynamics of materials. The focus is on gaining physical and chemical insight into the properties and potential applications of condensed matter systems. Within the broad scope of the journal, beyond regular contributions, the editors have identified submissions in the following areas of physics and chemistry of solids to be of special current interest to the journal: Low-dimensional systems Exotic states of quantum electron matter including topological phases Energy conversion and storage Interfaces, nanoparticles and catalysts.