A direct electrochemical route from oxides to TiMn2 hydrogen storage alloy

doi:10.1016/j.cjche.2015.08.033

Abstract

Abstract: This study is for investigating the direct electro-deoxidation ofmixed TiO₂-MnO₂ powder to prepare TiMn₂ alloy in molten calciumchloride. The influences of process parameters, such as sintering temperature, cell voltage, and electrolysis time, on the electrolysis processwere examined to investigate themechanismof alloy formation. The composition and morphology of the products were analyzed by XRD and SEM, respectively. The electrochemical property of TiMn₂ alloywas investigated by cyclic voltammetrymeasurements. The results showthat pure TiMn₂ can be prepared by direct electrochemical reduction of mixed TiO₂/MnO₂ pellets at a voltage of 3.1 V in molten calcium chloride of 900 ℃ for 7 h. The electro-deoxidation proceeds from the reduction of manganese oxides to Mn,which is reduced by TiO₂ or CaTiO₃ to formTiMn₂ alloy. The cyclic voltammetrymeasurements using powder microelectrode show that the prepared TiMn₂ alloy has good electrochemical hydrogen storage property.

Key words: Electro-deoxidation, TiMn₂ alloy, CaCl₂ melt, Oxides, Hydrogen storage

摘要： This study is for investigating the direct electro-deoxidation ofmixed TiO₂-MnO₂ powder to prepare TiMn₂ alloy in molten calciumchloride. The influences of process parameters, such as sintering temperature, cell voltage, and electrolysis time, on the electrolysis processwere examined to investigate themechanismof alloy formation. The composition and morphology of the products were analyzed by XRD and SEM, respectively. The electrochemical property of TiMn₂ alloywas investigated by cyclic voltammetrymeasurements. The results showthat pure TiMn₂ can be prepared by direct electrochemical reduction of mixed TiO₂/MnO₂ pellets at a voltage of 3.1 V in molten calcium chloride of 900 ℃ for 7 h. The electro-deoxidation proceeds from the reduction of manganese oxides to Mn,which is reduced by TiO₂ or CaTiO₃ to formTiMn₂ alloy. The cyclic voltammetrymeasurements using powder microelectrode show that the prepared TiMn₂ alloy has good electrochemical hydrogen storage property.

关键词: Electro-deoxidation, TiMn₂ alloy, CaCl₂ melt, Oxides, Hydrogen storage

Jing Zhu, Lei Dai, Yao Yu, Jilin Cao, Ling Wang. A direct electrochemical route from oxides to TiMn₂ hydrogen storage alloy[J]. Chin.J.Chem.Eng., 2015, 23(11): 1865-1870.

Jing Zhu, Lei Dai, Yao Yu, Jilin Cao, Ling Wang. A direct electrochemical route from oxides to TiMn₂ hydrogen storage alloy[J]. Chinese Journal of Chemical Engineering, 2015, 23(11): 1865-1870.

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A direct electrochemical route from oxides to TiMn₂ hydrogen storage alloy

A direct electrochemical route from oxides to TiMn₂ hydrogen storage alloy

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