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学科主题: 物理化学
题名: Enhanced Electron Penetration through an Ultrathin Graphene Layer for Highly Efficient Catalysis of the Hydrogen Evolution Reaction
作者: Deng, Jiao1;  Ren, Pengju1;  Deng, Dehui1;  Bao, Xinhe1
通讯作者: 任鹏举 ;  包信和
关键词: electrocatalysis ;  graphene ;  non-precious metals ;  hydrogen evolution reaction ;  nanoparticles
刊名: ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
发表日期: 2015-02-09
DOI: 10.1002/anie.201409524
卷: 54, 期:7, 页:2100-2104
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Multidisciplinary
研究领域[WOS]: Chemistry
英文摘要: Major challenges encountered when trying to replace precious-metal-based electrocatalysts of the hydrogen evolution reaction (HER) in acidic media are related to the low efficiency and stability of non-precious-metal compounds. Therefore, new concepts and strategies have to be devised to develop electrocatalysts that are based on earth-abundant materials. Herein, we report a hierarchical architecture that consists of ultrathin graphene shells (only 1-3 layers) that encapsulate a uniform CoNi nanoalloy to enhance its HER performance in acidic media. The optimized catalyst exhibits high stability and activity with an onset overpotential of almost zero versus the reversible hydrogen electrode (RHE) and an overpotential of only 142 mV at 10 mAcm(-2), which is quite close to that of commercial 40% Pt/C catalysts. Density functional theory (DFT) calculations indicate that the ultrathin graphene shells strongly promote electron penetration from the CoNi nanoalloy to the graphene surface. With nitrogen dopants, they synergistically increase the electron density on the graphene surface, which results in superior HER activity on the graphene shells.
关键词[WOS]: ACTIVE EDGE SITES ;  CARBON NANOTUBES ;  OXYGEN REDUCTION ;  PHOSPHIDE NANOPARTICLES ;  ASTERISK-ASTERISK ;  WATER ;  ELECTROCATALYSIS ;  MOLYBDENUM ;  OXIDATION ;  IRON
语种: 英语
WOS记录号: WOS:000349391000013
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/143744
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

Recommended Citation:
Deng, Jiao,Ren, Pengju,Deng, Dehui,et al. Enhanced Electron Penetration through an Ultrathin Graphene Layer for Highly Efficient Catalysis of the Hydrogen Evolution Reaction[J]. ANGEWANDTE CHEMIE-INTERNATIONAL EDITION,2015,54(7):2100-2104.
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