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题名: Single Crystal (Mn,Co)(3)O-4 Octahedra for Highly Efficient Oxygen Reduction Reactions
作者: Liu, Huanying1;  Zhu, Xuefeng1;  Li, Mingrun1;  Tang, Qiwen2;  Sun, Gongquan2;  Yang, Weishen1
关键词: ORR selectivity ;  facet-determined catalysis ;  single-crystal octahedron ;  (Mn,Co)(3)O-4 ;  spinel oxides
刊名: ELECTROCHIMICA ACTA
发表日期: 2014-10-20
DOI: 10.1016/j.electacta.2014.08.087
卷: 144, 页:31-41
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Electrochemistry
研究领域[WOS]: Electrochemistry
英文摘要: Single-crystal (Mn,Co)(3)O-4 octahedra were synthesized through a novel precipitation-aging method. Well-defined single-crystal octahedra can be formed by carefully controlling the precipitation-dissolution equilibrium, oxygen concentration, and solution temperature during synthesis to match the rates of spinel nucleation and octahedra growth. The single-crystal (Mn,Co)(3)O-4 octahedra expose {111} and {011} facets of cubic and tetragonal phases, respectively, depending on the Mn/Co ratio. However, only single-crystal octahedra of Mn2CoO4 and Mn2.5Co0.5O4 with exposed {011} facets show the highest selectivity towards 4e(-) and 2e(-) oxygen reduction reactions (ORR) in alkaline solution, respectively. Furthermore, the single-crystal Mn2CoO4 octahedra with exposed {011} facets shows similar to 30 times higher area specific activity for ORR than that of nanoparticles with random/mixed facets. The high electrocatalytic activity and selectivity towards ORR are correlated with the octahedral shape, the exposed facet, and the ratio of cations on the exposed facets (especially the octahedrally coordinated Mn-4 cations). This facet dependent catalytic performance provides a new route for obtaining highly selective and active ORR electrocatalysts. (C) 2014 Elsevier Ltd. All rights reserved.
关键词[WOS]: NITROGEN-DOPED CARBON ;  0-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-1 SPINEL FILMS ;  RAY PHOTOELECTRON-SPECTROSCOPY ;  CO-O NANOCRYSTALS ;  MANGANESE OXIDES ;  SPRAY-PYROLYSIS ;  ALKALINE MEDIA ;  FUEL-CELLS ;  ELECTROCATALYTIC ACTIVITY ;  HYDROGEN-PEROXIDE
语种: 英语
WOS记录号: WOS:000343951100005
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/145613
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Direct Alcohol Fuel Cell Lab, Dalian 116023, Peoples R China

Recommended Citation:
Liu, Huanying,Zhu, Xuefeng,Li, Mingrun,et al. Single Crystal (Mn,Co)(3)O-4 Octahedra for Highly Efficient Oxygen Reduction Reactions[J]. ELECTROCHIMICA ACTA,2014,144:31-41.
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