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合成・材料

Chemically Doped Holey Graphene Edge Based on Geometrical Design Enhances Electrochemical Hydrogen Production

 On 4 April 2019, Tohoku University, University of Tsukuba, Osaka University, Toyama Prefectural University, Max Planck Institute, and Kanazawa University announced that the research group made up by researchers from them succeeded in accelerating electrochemical hydrogen evolution reaction by chemical doping on holey graphene edge that brings geometrical frustration. This research was sup-ported by several funds, such as JST-PRESTO and Nanotechnology Platform Project of MEXT. Details were published in Advanced Science*.

 Hydrogen is a promising material for energy carrier in sustainable society and currently produced by electrochemical reaction using precious metal catalysts. Development of metal-free catalysts has been highly demanded and enhancement of catalytic activity of graphene has been challenged.

 The research group has found that the graphene edge has a geometrically distorted nature to provide enhanced accessibility of chemical dopants for improving catalytic activity. Then, graphene was synthe-sized on SiO2 nanoparticle-dispersed copper substrate by chemical vapor deposition (CVD) with nitrogen (N) and phosphorus (P) dopants in the vapor. Removal of nanoparticles and substrate resulted in holey graphene edge chemically doped with N and P. Atomic resolution transmission electron microscope (TEM) observations clearly identified the presence of N and P at the graphene edge. Scanning electro-chemical cell microscopy (SECCM) observations, and density functional theory (DFT) calculations con-firmed the acceleration of hydrogen evolution reaction (HER).

*Akichika Kumatani, Chiho Miura, Hirotaka Kuramochi, Tatsuhiko Ohto, Mitsuru Wakisaka, Yuki Nagata, Hiroki Ida, Yasufumi Takahashi, Kailong Hu, Samuel Jeong, Jun-ichi Fujita, Tomokazu Matsue, Yoshikazu Ito, "Chemical Dopants on Edge of Holey Graphene Accelerate Electrochemical Hydrogen Evolution Reaction", Advanced Science, Early View, doi: 10.1002/advs.201900119; First published: 01 April 2019