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

被引：0
|
作者：
Katayama, Misato [1 ]
Azuma, Asaka [1 ]
Shibata, Sojiro [1 ]
Kawaguchi, Ayaka [1 ]
Maegawa, Sota [1 ]
Hachiuma, Kanki [1 ]
Nakamura, Shunki [1 ]
Urano, Yoko [1 ]
Niwa, Yasuhiro [2 ]
Kimura, Masao [2 ]
Inada, Yasuhiro [1 ]
机构：
[1] Ritsumeikan Univ, Grad Sch Life Sci, Noji Higashi 1-1-1, Kusatsu 5258577, Japan
[2] High Energy Accelerator Res Org, Photon Factory, Oho 1-1, Tsukuba 3050801, Japan
来源：
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2025年 / 200卷
关键词：
Reduction of metal(II) chloride; Chlorination of metal; In situ XAFS; Thermochemical conversion temperature; Electrochemical conversion voltage; SOLID-ELECTROLYTE INTERPHASE; ION BATTERY; IN-SITU; SOLVATION STRUCTURES; CRYSTAL-STRUCTURE; REDOX REACTIONS; LITHIUM; CATALYSTS; LI; PERFORMANCE;
D O I：
10.1016/j.jpcs.2025.112568
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
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 degrees 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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页数：8
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