期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 858, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.157672
关键词
Single-atom; Manganese oxide nanorods; Oxygen reduction reaction; Mg-air fuel cell
资金
- Hunan Provincial Natural Science Foundation of China [2018JJ3529]
- Scientific Research Fund of Hunan Provincial Education Department [18C0231]
This study demonstrates the enhancement of oxygen reduction performance in Mg-air fuel cells by anchoring Ag single atoms onto the surface of alpha-MnO2 nanorods, showing improved catalytic activity and high power density. The Ag@alpha-MnO2 catalyst exhibits better stability, anti-poisoning capability, and comparable performance to commercial Pt/C, providing new ideas for efficient and cost-effective ORR catalyst in metal-air fuel cells.
Neutral electrolyte-based Mg-air fuel cell is a promising alternative of power sources due to low cost, high specific energy and eco-friendly. However, developing high-efficiency and low-cost oxygen reduction catalysts to facilitate the large-scale application of metal air fuel cells remains a significant challenge. In this work, Ag single atoms are directly anchored onto the surface of alpha-MnO2 nanorods to enhance the oxygen reduction performance in Mg-air fuel cell. The decoration of atomic Ag significantly improved the catalytic activity of alpha-MnO2 due to the increase in content of Mn (III) and oxygen vacancies. The Ag decorated alpha-MnO2 (Ag@alpha-MnO2) with an extreme low Ag content of 1.53 wt% demonstrates a half-wave potential of 0.85 V (vs. reversible hydrogen electrode), a limited current density of 5.8 mA cm(-2) and a typical four-electron transfer pathway which is close to those of commercial Pt/C. Furthermore, it exhibits better stability and anti-poisoning capability than those of Pt/C. The Mg-air fuel cell containing Ag@alpha-MnO2 displayed a high power density of 107.2 mW cm(-2) at current density of 140.1 mA cm(-2) as well as an outstanding discharge performance. This work provides new ideas for preparing efficient and cost-effective ORR catalyst and promote the large-scale commercialization in metal-air fuel cells. (C) 2020 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据