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This study is for investigating the direct electro-deoxidation of mixed TiO_2-MnO_2 powder to prepare TiMn_2 alloy in molten calcium chloride.The influences of process parameters,such as sintering temperature,cell voltage,and electrolysis time,on the electrolysis process were examined to investigate the mechanism of alloy formation.The composition and morphology of the products were analyzed by XRD and SEM,respectively.The electrochemical property of TiMn_2 alloy was investigated by cyclic voltammetry measurements.The results show that pure TiMn_2can be prepared by direct electrochemical reduction of mixed TiO_2/MnO_2 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 TiO_2 or CaTiO_3 to form TiMn_2 alloy.The cyclic voltammetry measurements using powder microelectrode show that the prepared TiMn_2 alloy has good electrochemical hydrogen storage property.
This study is for investigating the direct electro-deoxidation of mixed TiO_2-MnO_2 powder to prepare TiMn_2 alloy in molten calcium chloride. These influences of process parameters, such as sintering temperature, cell voltage, and electrolysis time, on the electrolysis process were examined to investigate the mechanism of alloy formation.The composition and morphology of the products were analyzed by XRD and SEM, respectively. The electrochemical property of TiMn_2 alloy was investigated by cyclic voltammetry measurements.The results show that pure TiMn_2can be prepared by direct electrochemical reduction of mixed TiO_2 / MnO_2 pellets at a voltage of 3.1 V in molten calcium chloride at 900 ℃ for 7 h. The electro-deoxidation proceeds from the reduction of manganese oxides to Mn, which is reduced by TiO_2 or CaTiO_3 to form TiMn_2 alloy. Cyclic voltammetry measurements using powder microelectrode show that the prepared TiMn_2 alloy has good electrochemical hydrogen storage property.