Manganese oxide-graphene composite as an efficient catalyst for 4-electron reduction of oxygen in alkaline media

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	Manganese oxide-graphene composite as an efficient catalyst for 4-electron reduction of oxygen in alkaline media
	Wu, Jiajia1,2 ; Zhang, Dun 1; Wang, Yi1 ; Wan, Yi 1,2
刊名	ELECTROCHIMICA ACTA
	2012-07-30
卷号	75 页码:305-310
关键词	Oxygen reduction reaction Catalyst Manganese oxide-graphene composite Catalytic mechanism
ISSN号	0013-4686
通讯作者	Zhang, D (reprint author), Chinese Acad Sci, Shandong Prov Key Lab Corros Sci, Inst Oceanol, Qingdao 266071, Peoples R China.
英文摘要	The catalytic activity of manganese oxide (MnOx)-graphene composite prepared by a physical method towards oxygen (O-2) reduction reaction in 0.1 M KOH solution has been investigated. For a better performance, MnOx materials with different crystallographic structures and morphologies have been synthesized, and their catalytic properties and stability for O-2 reduction are evaluated with linear sweep voltammetry and current-time chronoamperometry. The results show that the catalytic activity decreases in the sequence: alpha-MnO2 nanowire > amorphous MnOx nanoparticle > beta-MnO2 microprism, and alpha-MnO2 nanowire is more stable than amorphous MnOx nanoparticle. Thus, alpha-MnO2 nanowire is selected to combine with graphene. The modification of graphene on GC electrode leads to ca. 130 mV positive shift of the half-wave potential for the reduction of O-2 to peroxide (HO2-), and further introduction of alpha-MnO2 nanowire catalyzes the disproportionation of HO2- produced effectively, which enables 4-electron reduction of O-2 at low overpotential. In addition, the composite possesses good durability. (C) 2012 Published by Elsevier Ltd.
学科主题	Electrochemistry
收录类别	SCI
原文出处	10.1016/j.electacta.2012.05.005
语种	英语
WOS记录号	WOS:000306884100040
公开日期	2013-09-24
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/12475]
专题	海洋研究所_海洋腐蚀与防护研究发展中心
作者单位	1.Chinese Acad Sci, Shandong Prov Key Lab Corros Sci, Inst Oceanol, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
推荐引用方式 GB/T 7714	Wu, Jiajia,Zhang, Dun,Wang, Yi,et al. Manganese oxide-graphene composite as an efficient catalyst for 4-electron reduction of oxygen in alkaline media[J]. ELECTROCHIMICA ACTA,2012,75:305-310.
APA	Wu, Jiajia,Zhang, Dun,Wang, Yi,&Wan, Yi.(2012).Manganese oxide-graphene composite as an efficient catalyst for 4-electron reduction of oxygen in alkaline media.ELECTROCHIMICA ACTA,75,305-310.
MLA	Wu, Jiajia,et al."Manganese oxide-graphene composite as an efficient catalyst for 4-electron reduction of oxygen in alkaline media".ELECTROCHIMICA ACTA 75(2012):305-310.