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通过水热合成法制备Cu_xO(CuO-Cu2_O)纳米球催化剂,控制水热温度为180℃,合成时间为2h时,制备的催化活性最佳,CO_2还原的起峰电位可达-0.55V(vs.SHE),在-1.25V(vs.SHE)电位下的最大电流密度可达-20.5mA/cm~2。测试电容能达到800μF/cm~2,是同样的测试条件下的气体扩散电极(GDL)电容的4.7倍左右。SEM分析结果表明,其具有特殊的三维纳米球结构。BET分析结果表明,其比表面积达到约63.50m~2/g。Cu_xO180~(-2)/GDL电极的交换电流密度约为1.6×10~(-5)A/cm~2,高出同类研究的i0值(-10~(-10)A/cm~2)约5个数量级。
The preparation of Cu_xO (CuO-Cu2_O) nanospheres catalyst by hydrothermal synthesis method has the best catalytic activity when the hydrothermal temperature is 180 ℃ and the synthesis time is 2h, and the peak potential of CO_2 reduction can reach -0.55V (vs .SHE), the maximum current density can reach -20.5mA / cm ~ 2 at -1.25V (vs.SHE) potential. The test capacitance can reach 800μF / cm ~ 2, which is about 4.7 times that of the GDL under the same test conditions. SEM analysis shows that it has a special three-dimensional nanosphere structure. The results of BET analysis showed that the specific surface area reached 63.50m ~ 2 / g. The exchange current density of Cu_xO180 ~ (-2) / GDL electrode is about 1.6 × 10 ~ (-5) A / cm ~ 2, which is higher than the i0 value (-10 ~ (-10) A / cm ~ 2) About 5 orders of magnitude.