通过溶胶-凝胶法制备出A位Sr掺杂的钙钛矿型氧化物La1-xSrxCoO3(x=0,0.2,0.4,0.6,0.8),并将其作为催化剂应用于双功能氧电极中.测试结果表明,A位Sr的掺杂的La1-xSrxCoO3比LaCoO3具有更高的电催化活性,并且La0.6Sr0.4CoO3在氧还原和氧析出反应中均表现出最优的催化性能,最大电流密度分别达到0.244 A·cm-2 (-0.6V vs Hg/HgO)和0.303 A·cm-2(1 V vs Hg/HgO).为进一步提高催化剂的催化活性,将水热法制备的α-MnO2纳米管与La0.6Sr0.4CoO3复合作为双功能催化剂.当α-MnO2的质量分数为40％时,比起单一的α-MnO2或钙钛矿氧化物,α-MnO2/La0.6Sr0.4CoO3复合材料表现出协同效应,有更好的双功能电催化活性.使双效氧电极具有更好的电化学性能及稳定性.%The Sr-doped perovskite oxides La1-xSrxCoO3 (x=O,0.2,0.4,0.6,0.8),as the electrocatalyst for bifunctional oxygen electrode,were synthesized by sol-gel method.The test results show that Sr-doped La1-xSrxCoO3 has higher electrocatalytic activities than LaCoO3.In addition,La0.6Sr0.4CoO3 reveal excellent catalytic activity for the oxygen evolution reaction and oxygen reduction reaction,reaching a maximum of 0.244 A ·cm-2 (at-0.6 V vs Hg/HgO) and 0.303 A·cm-2 (at 1 V vs Hg/HgO).In order to further improve the catalytic activity of the catalyst,α-MnO2 nano-wires as bi-functional catalyst was prepared by hydrothermal synthesis and added into the La0.6Sr0.4CoO3.The activities of bi-functional catalysts of α-MnO2/La0.6Sr0.4CoO3 were markedly superior compared with α-MnO2 or La0.6Sr0.4CoO3 perovskite oxide when the mass fraction of 40％ α-MnO2,demonstrating a synergistic effect,which was responsible for the improvement of electrochemical catalytic activity and stability of the bifunctional oxygen electrode.
展开▼
