本文采用简单的溶胶―凝胶法合成了 NiCo2O4包裹的 CuO 同轴纳米电缆异质结催化剂.扫描电子显微镜(SEM)和X射线衍射(XRD)结果表明,复合之后 CuO 和 NiCo2O4的形态与结构保持不变.进一步采用旋转圆盘电极(RRDE)技术研究了在碱性溶液中纯 NiCo2O4、纯 CuO 和CuO @ NiCo2O4复合催化剂的电催化性能.对于氧还原反应(ORR),复合后的CuO @ NiCo2O4比单独的纯CuO 和纯 NiCo2O4显示出高得多的电化学活性,其特征在于具有更高的极限扩散电流密度和更正的起始电位,同时复合后的催化剂具有更优异的稳定性,这可以归因于其独特的同轴纳米电缆结构和复合催化剂中CuO 和NiCo2O4之间的协同催化作用.%NiCo2O4―wrapped CuO coaxial nanocable catalysts were synthesized via a simple sol―gel method.Scanning electron microscopy (SEM)and X-ray diffraction (XRD)results showed that the morphologies and the structures of the CuO and NiCo2O4remain unchanged after hybrid-ization.The electrocatalytic performances of pure NiCo2O4,pure CuO nanorods and hybrid CuO@NiCo2O4in alkaline solution were studied and compared using a rotating ring disk electrode (RRDE)technique.For the oxygen reduction reaction(ORR),the hybrid CuO@NiCo2O4exhib-ited much higher active than the solo one with long-term stability,characterized with the highest diffusion-limited current density and more positive onset potential,which could be ascribed to the novel hybrid structure of the composited coaxial nanocable catalyst and the synergistic effect be-tween CuO and NiCo2O4.
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