La0.95FeO3-δ/C复合电极制备工艺对氧还原和氧析出催化性能的影响
收稿日期: 2021-01-11
网络出版日期: 2021-06-08
基金资助
国家自然科学基金项目(22002089);上海市浦江人才计划(19PJ1404400)
Effect of Preparation Process of La0.95FeO3-δ/C Composite Electrode on Preparation and Bifunctional Electrocatalytic Properties
Received date: 2021-01-11
Online published: 2021-06-08
为优化具有A位镧缺失的铁酸镧(La0.95FeO3-δ)钙钛矿的氧还原反应(ORR)和氧析出反应(OER)双功能电催化性能,研究La0.95FeO3-δ/C复合电极中碳的形态、电极浆料制备方法和催化剂载量对双功能电催化性能的影响,并分析其影响机理.结果表明:当La0.95FeO3-δ与导电碳形成复合电极时,ORR和OER催化活性显著提高;La0.95FeO3-δ/C复合电极的电催化性能与碳的形态以及电极浆料制备方法密切相关,在超声分散-球磨-超声分散的最佳浆料制备方法下,当以EC600JD为导电碳,La0.95FeO3-δ与EC600JD的载量分别为0.6 mg/cm2与0.12 mg/cm2时,ORR和OER催化活性最佳.经过工艺优化的La0.95FeO3-δ/C复合电极具有优异的双功能电催化性能,且其制备简单、成本低,有望在锂氧电池等器件中得到应用.
胡桓铭, 杨帆, 章俊良 . La0.95FeO3-δ/C复合电极制备工艺对氧还原和氧析出催化性能的影响[J]. 上海交通大学学报, 2021 , 55(9) : 1049 -1057 . DOI: 10.16183/j.cnki.jsjtu.2021.009
In order to optimize the bifunctional electrocatalytic performance of La0.95FeO3-δ, the effects and influencing mechanism of carbon morphology, electrode ink preparation, and catalyst loading on the bifunctional electrocatalytic performance of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) were investigated. The results show that compared with La0.95FeO3-δ, the catalytic activity of La0.95FeO3-δ/C is significantly improved. The bifunctional electrocatalytic performance of La0.95FeO3-δ/C is mainly dependent on carbon morphology and electrode ink preparation. An optimum bifunctional performance is achieved in a composite electrode with 0.6 mg/cm2 La0.95FeO3-δ and 0.12 mg/cm2 EC600JD prepared by ultrasonic dispersion, ball milling, and ultrasonic dispersion. The optimized La0.95FeO3-δ/C has an excellent bifunctional electrocatalytic performance, simple preparation, and low cost, which is expected to be applied in Li-O2 batteries.
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