Activity and stability of the Ni(OH)(2)-MnOx/C composite for oxygen reduction reaction in alkaline solution

	Activity and stability of the Ni(OH)(2)-MnOx/C composite for oxygen reduction reaction in alkaline solution
	Wu, Qiumei 1,2; Jiang, Luhua 1; Tang, Qiwen 1; Liu, Jing 1; Wang, Suli 1; Sun, Gongquan 1
刊名	electrochimica acta
	2013-02-28
卷号	91 页码:314-322
关键词	Oxygen reduction reaction Manganese oxide Nickel hydroxide Durability
英文摘要	carbon-supported ni(oh)(2)-mnox/c composite was synthesized by reducing the amorphous mno2/c suspension in the presence of ni2+ with nabh4. the electrocatalytic activity and stability toward the oxygen reduction reaction (orr) in alkaline media as well as the physical properties before and after the accelerated aging tests for the ni(oh)(2)-mnox/c composite were investigated and compared with those for the mnox/c and the amorphous mno2/c through electrochemical techniques, x-ray diffraction (xrd), x-ray photoelectron spectroscopy (xps) and transmission electron microscopy (tem). the ni(oh)(2)-mnox/c composite is more active toward the orr than the mno2/c and mnox/c, especially at low overpotentials, with the half-wave potential shifting positively about 0.05 v. experienced the accelerated aging tests, the orr limiting current for the ni(oh)(2) mnox/c composite just degrades a little, while for the mno2/c and mnox/c the orr limiting currents decrease significantly. though the more obvious negative shifting of the orr half-wave potential, the ni(oh)(2)-mnox/c composite still processes higher current than those for the mno2/c and mnox/c in the mixed kinetic-diffusion control region. after the accelerated aging tests, the electron transfer number of the orr for the ni(oh)(2)-mnox/c composite still closes to four, while for the mno2/c and mnox/c, the electron transfer numbers decrease obviously from 3.88 and 3.87 to 3.22 and 3.55, respectively. the results of xrd show that phase transformation for mn occurs and xps studies prove that the average valence of mn decreases for both of the mno2/c and mnox/c samples after the accelerated aging tests, but no obvious change occurs for the ni(oh)(2)-mnox/c sample. the tem images before and after accelerated aging tests show that the morphology of the ni(oh)(2)-mnox/c keeps unchanged loosely-aggregated floccules, while for the mno2/c and mnox/c, the morphology changes from the initial loosely-aggregated floccules and nano-rods to nano-blocks and some branch-like substances, respectively. the addition of ni(oh)(2) into mnox plays a significant role in its stabilization. crown copyright (c) 2012 published by elsevier ltd. all rights reserved.
WOS标题词	science & technology ; physical sciences
类目[WOS]	electrochemistry
研究领域[WOS]	electrochemistry
关键词[WOS]	manganese oxide nanoparticles ; shape-controlled synthesis ; fuel-cells ; electrocatalytic activity ; palladium nanoparticles ; electrode materials ; dependent activity ; carbon electrodes ; reaction orr ; catalysts
收录类别	SCI
语种	英语
WOS记录号	WOS:000316707400044
公开日期	2015-11-10
内容类型	期刊论文
源URL	[http://159.226.238.44/handle/321008/137488]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
作者单位	1.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, Dalian 116023, Peoples R China 2.Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China
推荐引用方式 GB/T 7714	Wu, Qiumei,Jiang, Luhua,Tang, Qiwen,et al. Activity and stability of the Ni(OH)(2)-MnOx/C composite for oxygen reduction reaction in alkaline solution[J]. electrochimica acta,2013,91:314-322.
APA	Wu, Qiumei,Jiang, Luhua,Tang, Qiwen,Liu, Jing,Wang, Suli,&Sun, Gongquan.(2013).Activity and stability of the Ni(OH)(2)-MnOx/C composite for oxygen reduction reaction in alkaline solution.electrochimica acta,91,314-322.
MLA	Wu, Qiumei,et al."Activity and stability of the Ni(OH)(2)-MnOx/C composite for oxygen reduction reaction in alkaline solution".electrochimica acta 91(2013):314-322.