La1-xSrxCoO3(x=0,0.2,0.4,0.6,0.8)钙钛矿型氧化物的催化性能及改性
Electrocatalytic Properties and Modification of La1-xSrxCoO3 (x=0, 0.2, 0.4, 0.6, 0.8) Perovskite Oxide
作者单位E-mail
于文婉 桂林理工大学, 广西电磁化学功能物质重点实验室, 桂林 541004  
黄红霞 桂林理工大学, 广西电磁化学功能物质重点实验室, 桂林 541004 hhxhunan@126.com 
王成 桂林理工大学, 广西电磁化学功能物质重点实验室, 桂林 541004  
摘要: 通过溶胶-凝胶法制备出A位Sr掺杂的钙钛矿型氧化物La1-xSrxCoO3x=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(-0.6 V 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。
关键词: LaCoO3  钙钛矿氧化物  α-MnO2  双功能催化剂
基金项目: 广西自然科学基金(No.2016GXNSFAA380201)和广西电磁化学功能物质重点实验室研究基金(No.EMFM20161103)资助项目。
Abstract: The Sr-doped perovskite oxides La1-xSrxCoO3 (x=0, 0.2, 0.4, 0.6, 0.8), as the electrocatalyst for bi-functional 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 bi-functional oxygen electrode.
Keywords: LaCoO3  perovskite oxide  α-MnO2  bi-functional catalysts
投稿时间:2017-09-28 修订日期:2017-11-22
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于文婉,黄红霞,王成.La1-xSrxCoO3(x=0,0.2,0.4,0.6,0.8)钙钛矿型氧化物的催化性能及改性[J].无机化学学报,2018,34(3):475-482.
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