胡桓铭^a, 杨帆^b(), 章俊良^b

a.上海交通大学 中英国际低碳学院,上海 200240
b.上海交通大学 机械与动力工程学院,上海 200240

收稿日期:2021-01-11出版日期:2021-09-28发布日期:2021-10-08
通讯作者:杨帆E-mail:fanyang_0123@sjtu.edu.cn
作者简介:胡桓铭(1994-),男,河南省郑州市人,硕士生,从事钙钛矿氧化物的电催化性能研究.
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 La_0.95FeO_3-δ/C Composite Electrode on Preparation and Bifunctional Electrocatalytic Properties

HU Huanming^a, YANG Fan^b(), ZHANG Junliang^b

a. China-UK Low Carbon College, Shanghai Jiao Tong University, Shanghai 200240, China
b. School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

Received:2021-01-11Online:2021-09-28Published:2021-10-08
Contact:YANG Fan E-mail:fanyang_0123@sjtu.edu.cn

摘要/Abstract

摘要： 为优化具有A位镧缺失的铁酸镧(La_0.95FeO_3-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La_0.95FeO_3-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La_0.95FeO_3-δ与导电碳形成复合电极时,ORR和OER催化活性显著提高;La_0.95FeO_3-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,La_0.95FeO_3-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La_0.95FeO_3-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.
关键词: LaFeO₃钙钛矿, 氧还原反应, 氧析出反应, 双功能催化剂, 电催化
Abstract: In order to optimize the bifunctional electrocatalytic performance of La_0.95FeO_3-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 La_0.95FeO_3-δ, the catalytic activity of La_0.95FeO_3-δ/C is significantly improved. The bifunctional electrocatalytic performance of La_0.95FeO_3-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 La_0.95FeO_3-δ and 0.12 mg/cm² EC600JD prepared by ultrasonic dispersion, ball milling, and ultrasonic dispersion. The optimized La_0.95FeO_3-δ/C has an excellent bifunctional electrocatalytic performance, simple preparation, and low cost, which is expected to be applied in Li-O₂ batteries.
Key words: LaFeO₃ perovskite, oxygen reduction reaction(ORR), oxygen evolution reaction(OER), bifunctional electrocatalyst, electrocatalysis


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