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以混合的金属氧化物RuO_2、TiO_2、Ag_2O和SnO_2对钛表面进行了修饰,得到了四个不同氧化物组成的钛电极,即RuO_2+TiO_2/Ti(35:65,A)、RuO_2+TiO_2/Ti(25:75,B)、RuO_2+TiO_2+Ag_2O/Ti(C)和RuO_2+TiO_2+SnO2/Ti(D),采用循环伏安法研究了其常温常压下在0.1mol/L的KHCO3水溶液中的电化学行为,在-900mV的恒定电位下进行了CO2的还原,分析了电极的稳定性和还原产物的情况。结果表明,金属氧化物电极对CO2还原产生了很好的催化作用,-900mV下对甲酸和甲醇有高的选择性,还原的液相产物中仅发现了甲酸和甲醇,电极A、B、C和D上生成甲酸和甲醇的总电流效率分别为84.4%、57.4%、93.1%和88.1%,且长时间电解过程中电极具有很好的稳定性,是有很好应用前景的催化电极材料。
The surface of titanium was modified with mixed metal oxides RuO_2, TiO_2, Ag_2O and SnO_2 to obtain four titanium electrodes with different oxides, namely RuO_2 + TiO_2 / Ti (35:65, A), RuO_2 + TiO_2 / Ti (25:75, B), RuO_2 + TiO_2 + Ag_2O / Ti (C) and RuO_2 + TiO_2 + SnO_2 / Ti (D) were studied by cyclic voltammetry at 0.1mol / L KHCO3 Aqueous solution, the reduction of CO2 was carried out at a constant potential of -900mV, and the stability of the electrode and the product of reduction were analyzed. The results show that the metal oxide electrode has a good catalytic effect on the reduction of CO2. Formate and methanol have a high selectivity at -900mV, and only formic acid and methanol are found in the reduced liquid product. The electrodes A, B, C The total current efficiency of the formation of formic acid and methanol on D is 84.4%, 57.4%, 93.1% and 88.1%, respectively. The electrode has good stability during long time electrolysis and is a promising catalytic electrode material.