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

doi:10.16183/j.cnki.jsjtu.2021.009

上海交通大学学报 ›› 2021, Vol. 55 ›› Issue (9): 1049-1057.doi: 10.16183/j.cnki.jsjtu.2021.009

所属专题：《上海交通大学学报》2021年12期专题汇总专辑；《上海交通大学学报》2021年“能源与动力工程”专题

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La_0.95FeO_3-_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

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:2021-01-11 Online:2021-09-28 Published: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

中图分类号:

胡桓铭, 杨帆, 章俊良. La_0.95FeO_3-_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.

HU Huanming, YANG Fan, ZHANG Junliang. Effect of Preparation Process of La_0.95FeO_3-_δ/C Composite Electrode on Preparation and Bifunctional Electrocatalytic Properties[J]. Journal of Shanghai Jiao Tong University, 2021, 55(9): 1049-1057.

图/表 13

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表1

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图3

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图5

表3

图6

图7

图8

表4

表5

不同活性材料的双功能电催化性能指标

活性材料	φ_ORR	η_ORR	φ_OER	η_OER	Δφ
La_0.95FeO_3-_δ (本文)	0.75	0.48	1.76	0.53	1.01
La_0.95Fe $O 3 - δ$ ^[16]	0.58	0.65	1.64	0.41	1.06
磷掺杂LaFe $O 3$ ^[17]	0.72	0.51	1.69	0.46	0.97
LaFeO_3-_x纳米片^[15]	0.57	0.66	1.78	0.55	1.21
La_0.58Sr_0.4Co_0.5Fe_0.5 $O 3 - δ$ ^[19]	0.67	0.56	1.72	0.49	1.05
Pt/C^[20]	0.97	0.26	2.19	0.96	1.22
Ir $O 2$ ^[20]	0.38	0.85	1.70	0.47	1.32
Ru $O 2$ ^[20]	0.54	0.69	1.64	0.41	1.10

表5

参考文献 20

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导电碳	比表面积/ (m²·g^-1)	堆密度/ (g·cm^-3)	电导率/ (S·cm^-1)
CNT	> 150	0.22	> 100
EC600JD	> 1200	0.10~0.12	10~100^[18]

电极组成		载量/(mg·cm^-2)		浆料制备方法
活性物质	导电碳	活性物质	导电碳	浆料制备方法
La_0.95FeO_3-_δ	CNT	0.50	0.10	方法1
	EC600JD	0.50	0.10	方法1
		0.60	0.12	方法1
		0.60	0.12	方法2
		0.60	0.12	方法3
		0.50	0.10	方法3
		0.60	0.12	方法3
		0.75	0.25	方法3
		0.60	0	方法3
		0	0.12	方法3

浆料制备方法	η_ORR/mV	η_OER/mV
方法1	590	>600
方法2	500	570
方法3	480	530

La_0.95FeO_3-_δ载量/(mg·cm^-2)	η_ORR/mV	η_OER/mV
0.50	495	532
0.60	480	530
0.75	495	524

La_0.95FeO_3-_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

Effect of Preparation Process of La_0.95FeO_3-_δ/C Composite Electrode on Preparation and Bifunctional Electrocatalytic Properties

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[2]	孙晓文，杨鹏，张文光. 掺杂磺酸聚苯胺/碳纳米管复合膜电极制备及其应用[J]. 上海交通大学学报（自然版）, 2016, 50(02): 228-234.

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

Effect of Preparation Process of La0.95FeO3-δ/C Composite Electrode on Preparation and Bifunctional Electrocatalytic Properties

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La_0.95FeO_3-_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

Effect of Preparation Process of La_0.95FeO_3-_δ/C Composite Electrode on Preparation and Bifunctional Electrocatalytic Properties