| 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 |
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| 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-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（-0.6 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 |
| 摘要点击次数: 1596 |
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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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