Graphene Layer Encapsulation of Non-Noble Metal Nanoparticles as Acid-Stable Hydrogen Evolution Catalysts

Kailong Hu, Tatsuhiko Ohto, Linghan Chen, Jiuhui Han, Mitsuru Wakisaka, Yuki Nagata, Jun Ichi Fujita, Yoshikazu Ito

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

Acid-stable, non-noble catalysts are promising for hydrogen evolution reaction (HER); however, they get easily damaged when used in acidic electrolytes, thus reducing the HER lifetimes. Moreover, completely blocking catalysts from acidic electrolytes degrades HER performance. To achieve a balance between the HER lifetime and performance, we vary the number of N-doped graphene layers (1-2, 2-3, and 3-5 layers) encapsulating NiMo nanoparticles as efficient HER catalysts and obtain the optimal number of protective layers. Our data show that 3-5 graphene layers achieved the best balance, with a stable current density of 100 mA cm-2 for 25 h in 0.5 M H2SO4. Density functional theory calculations are performed to show the effect of encapsulating graphene layer number on the catalytic activity and protection of non-noble NiMo in acidic electrolytes.

Original languageEnglish
Pages (from-to)1539-1544
Number of pages6
JournalACS Energy Letters
Volume3
Issue number7
DOIs
Publication statusPublished - 2018 Jul 13

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Materials Chemistry

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