Abundant vanadium diboride with graphene-like boron layers for hydrogen evolution

Palani R. Jothi, Y. Zhang, K. Yubuta, D. B. Culver, M. Conley, B. P.T. Fokwa

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

We report on the design of abundant and highly active VB2 for hydrogen production. Density functional theory (DFT) calculations have predicted very high HER activity of the graphene-like B-layer, the V-terminated {100} layer, and the mixed V/B-terminated {101} layer of VB2. Bulk samples and nanoparticles of VB2 were synthesized and tested for their HER performance. The results indicate that both bulk and nano-VB2 are active for HER, consistent with theoretical predictions. In addition, the HER activity of VB2 is significantly increased at the nanoscale if compared to the bulk, reaching an overpotential of 192 mV at 10 mA/cm2 current density. Increased surface area and higher density of active sites are responsible for the higher nanoscale activity, making nano-VB2 the best HER boride to date in terms of abundance, stability, and activity in acidic solution.

Original languageEnglish
Pages (from-to)176-181
Number of pages6
JournalACS Applied Energy Materials
Volume2
Issue number1
DOIs
Publication statusPublished - 2019 Jan 28

Keywords

  • Gibbs free-energy calculations
  • Graphene-like boron layers
  • Hydrogen evolution
  • Metal borides
  • Nanoparticles

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Electrochemistry
  • Materials Chemistry
  • Electrical and Electronic Engineering

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