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作者:

Fan, Xiujun (Fan, Xiujun.) | Peng, Zhiwei (Peng, Zhiwei.) | Ye, Ruquan (Ye, Ruquan.) | Zhou, Haiqing (Zhou, Haiqing.) | Guo, Xia (Guo, Xia.) (学者:郭霞)

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摘要:

Transition metal carbide nanocrystalline M3C (M: Fe, Co, Ni) encapsulated in graphitic shells supported with vertically aligned graphene nanoribbons (VA-GNRs) are synthesized through a hot filament chemical vapor deposition (HF-CVD) method. The process is based on the direct reaction between iron group metals (Fe, Co, Ni) and carbon source, which are facilely get high purity carbide nanocrystals (NCs) and avoid any other impurity at relatively low temperature. The M3C-GNRs exhibit superior enhanced electrocatalystic activity for oxygen reduction reaction (ORR), including low Tafel slope (39, 41, and 45 mV dec(-1) for Fe3C-GNRs, Co3C-GNRs, and Ni3C-GNRs, respectively), positive onset potential (similar to 0.8 V), high electron transfer number (similar to 4), and long-term stability (no obvious drop after 20 000 s test). The M3C-GNRs catalyst also exhibits remarkable hydrogen evolution reaction (HER) activity with a large cathodic current density of 166.6, 79.6, and 116.4 mA cm(-2) at an overpotential of 200 mV, low onset overpotential of 32, 41, and 35 mV, small Tafel slope of 46, 57, and 54 mV dec(-1) for Fe3C-GNRs, Co3C-GNRs, and Ni3C-GNRs, respectively, as well as an excellent stability in acidic media.

关键词:

nanocrystals (NCs) vertically aligned graphene nanoribbons (VA-GNRs) oxygen reduction reaction (ORR) M3C (M: Fe, Co, Ni) hydrogen evolution reaction (HER)

作者机构:

  • [ 1 ] [Fan, Xiujun]Beijing Univ Technol, Coll Elect Informat & Control Engn, Beijing 100124, Peoples R China
  • [ 2 ] [Guo, Xia]Beijing Univ Technol, Coll Elect Informat & Control Engn, Beijing 100124, Peoples R China
  • [ 3 ] [Fan, Xiujun]Rice Univ, Dept Chem, Houston, TX 77005 USA
  • [ 4 ] [Peng, Zhiwei]Rice Univ, Dept Chem, Houston, TX 77005 USA
  • [ 5 ] [Ye, Ruquan]Rice Univ, Dept Chem, Houston, TX 77005 USA
  • [ 6 ] [Zhou, Haiqing]Rice Univ, Dept Chem, Houston, TX 77005 USA
  • [ 7 ] [Fan, Xiujun]Rice Univ, Richard E Smalley Inst Nanoscale Sci & Technol, Houston, TX 77005 USA
  • [ 8 ] [Zhou, Haiqing]Rice Univ, Richard E Smalley Inst Nanoscale Sci & Technol, Houston, TX 77005 USA

通讯作者信息:

  • [Fan, Xiujun]Beijing Univ Technol, Coll Elect Informat & Control Engn, Beijing 100124, Peoples R China

电子邮件地址:

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来源 :

ACS NANO

ISSN: 1936-0851

年份: 2015

期: 7

卷: 9

页码: 7407-7418

1 7 . 1 0 0

JCR@2022

ESI学科: CHEMISTRY;

ESI高被引阀值:253

JCR分区:1

中科院分区:1

被引次数:

WoS核心集被引频次: 432

SCOPUS被引频次: 456

ESI高被引论文在榜: 37 展开所有

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