标题: Calcium titanate corrosion inhibitor enabling carbon as inert anode for oxygen evolution in molten chlorides

作者: Du, KF (Du, Kai-fa); Li, WM (Li, Wen-miao); Wang, PL (Wang, Pei-lin); Guo, L (Guo, Lei); Chen, D (Chen, Di); Ma, YS (Ma, Yong-song); Yu, R (Yu, Rui); Yin, HY (Yin, Hua-yi); Wang, DH (Wang, Di-hua)

来源出版物: TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA  卷: 34  期: 10  页: 3400-3411  DOI: 10.1016/S1003-6326(24)66616-1  Early Access Date: NOV 2024  Published Date: 2024 OCT  

摘要: The corrosion inhibition efficacy of titanate (CaTiO3) for carbon anodes in molten salts was investigated through various analytical techniques, including linear sweep voltammetry, X-ray diffraction, scanning electron microscopy, and energy dispersion spectroscopy. The results demonstrate that the addition of CaTiO3 corrosion inhibitor efficiently passivates the carbon anode and leads to the formation of a dense CaTiO3 layer during the electrolysis process in molten CaCl2-CaO. Subsequently, the passivated carbon anode effectively undergoes the oxygen evolution reaction, with an optimal current density for passivation identified at 400 mA/cm2. Comprehensive investigations, including CaTiO3 solubility tests in molten CaCl2-CaO and numerical modeling of the stability of complex ionic structures, provide compelling evidence supporting "complexation-precipitation" passivation mechanism. This mechanism involves the initial formation of a complex containing TiO2<middle dot>nCaO by CaTiO3 and CaO, which subsequently decomposes to yield CaTiO3, firmly coating the surface of the carbon anode. In practical applications, the integration of CaTiO3 corrosion inhibitor with the carbon anode leads to the successful preparation of the FeCoNiCrMn high-entropy alloy without carbon contamination in the molten CaCl2-CaO.

作者关键词: corrosion inhibitor; calcium titanate; carbon anode; oxygen evolution reaction

地址: [Du, Kai-fa; Li, Wen-miao; Wang, Pei-lin; Guo, Lei; Chen, Di; Ma, Yong-song; Yu, Rui; Yin, Hua-yi; Wang, Di-hua] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China.

[Du, Kai-fa; Li, Wen-miao; Wang, Pei-lin; Guo, Lei; Chen, Di; Ma, Yong-song; Yu, Rui; Yin, Hua-yi; Wang, Di-hua] Hubei Int Sci & Technol Cooperat Base Sustainable, Wuhan 430072, Peoples R China.

通讯作者地址: Wang, DH (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China.

Wang, DH (通讯作者)，Hubei Int Sci & Technol Cooperat Base Sustainable, Wuhan 430072, Peoples R China.

电子邮件地址: wangdh@whu.edu.cn

影响因子：4.7