論文

査読有り
2019年4月

Chemical dopants on edge of holey graphene accelerate electrochemical hydrogen evolution reaction

Advanced Science
  • Kumatani, Akichika
  • ,
  • Miura, Chiho
  • ,
  • Kuramochi, Hirotaka
  • ,
  • Ohto, Tatsuhiko
  • ,
  • Wakisaka, Mitsuru
  • ,
  • Nagata, Yuki
  • ,
  • Ida, Hiroki
  • ,
  • Takahashi, Yasufumi
  • ,
  • Hu, Kailong
  • ,
  • Jeong, Samuel
  • ,
  • Fujita, Jun-ichi
  • ,
  • Matsue, Tomokazu
  • ,
  • Ito, Yoshikazu

6
10
開始ページ
1
終了ページ
8
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1002/advs.201900119
出版者・発行元
Wiley

Carbon-based metal-free catalysts for the hydrogen evolution reaction (HER) are essential for the development of a sustainable hydrogen society. Identification of the active sites in heterogeneous catalysis is key for the rational design of low-cost and eff icient catalysts. Here, by fabricating holey graphene with chemically dopants, the atomic-level mechanism for accelerating HER by chemical dopants is unveiled, through elemental mapping with atomistic characterizations, scanning electrochemical cell microscopy (SECCM), and density functional theory (DFT) calculations. It is found that the synergetic effects of two important factors-edge structure of graphene and nitrogen/phosphorous codoping-enhance HER activity. SECCM evidences that graphene edges with chemical dopants are electrochemically very active. Indeed, DFT calculation suggests that the pyridinic nitrogen atom could be the catalytically active sites. The HER activity is enhanced due to phosphorus dopants, because phosphorus dopants promote the charge accumulations on the catalytically active nitrogen atoms. These findings pave a path for engineering the edge structure of graphene in graphene-based catalysts.

リンク情報
DOI
https://doi.org/10.1002/advs.201900119
ID情報
  • DOI : 10.1002/advs.201900119
  • ISSN : 2198-3844

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