Self-Supported Composite of (Ni,Co)3C Mesoporous Nanosheets/N-Doped Carbon as a Flexible Electrocatalyst for pH-Universal Hydrogen Evolution

Mengqi Yao, Bojun Wang, Ni Wang, Sridhar Komarneni, Yunjian Chen, Jianwei Wang, Xiaobin Niu, Wencheng Hu

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

Scalable synthesis of highly efficient and nonprecious metal based catalysts for pH-universal hydrogen evolution reaction (HER) is a daunting challenge. In this work, we fabricated self-supported composites of (Ni,Co)3C mesoporous nanosheets/N-doped carbon with adjustable sizes from 1 cm × 1 cm to 25 cm × 25 cm using a facile and rapid electrodeposition, which was then followed by carbonization. The as-prepared catalyst shows small overpotentials of 58, 118, and 71 mV at 10 mA cm-2 in acid, neutral, and basic electrolytes, respectively with high exchange current densities. The above HER activities exceeded most non-noble metal caride-based catalysts in a pH-universal electrolyte. Theoretical calculations suggest that bimetallic carbide is favorable for HER because of its metallic conductivity, close-to-zero Gibbs free energy change (ΔGH*), and downshifted d-band center (ϵd) revealed by density of states (DOS). The outstanding performance can be attributed to the tunable ultrathin nanosheet-like structure, large specific surface area, and electronic structure modulations. Our work developed an efficient, controllable, and large-scale synthesis of a cost-effective, highly efficient, high performance, and stable catalyst for hydrogen evolution reaction, which can operate in a wide pH range.

Original languageEnglish (US)
Pages (from-to)5287-5295
Number of pages9
JournalACS Sustainable Chemistry and Engineering
Volume8
Issue number13
DOIs
StatePublished - Apr 6 2020

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Renewable Energy, Sustainability and the Environment

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