Chemical and structural engineering of transition metal boride towards excellent and sustainable hydrogen evolution reaction

Soumen Dutta, Hyuk Su Han, Minyeong Je, Heechae Choi, Jiseok Kwon, Keemin Park, Arindam Indra, Kang Min Kim, Ungyu Paik, Taeseup Song*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

82 Citations (Scopus)

Abstract

Herein, holey, thin, conductive nickel substituted cobalt molybdenum boride (Ni-CMB) nanosheets have been designed to obtain superior electrochemical HER performance with small overpotential of 69 mV at 10 mA cm-2 current density and lower Tafel slope of 76.3 mV dec-1 in alkaline medium. Incorporation of Ni leads to improved conductivity and favorable hydrogen adsorption on Mo sites, which collectively yield efficient electrocatalytic H2 production from Ni-CMB catalyst. The ultrathin nature (thickness = 5.0 nm) of the designed material expectedly helps to attain high exposure of active sites and facile charge transportation through the nanosheets. Additionally, the decorated mesopores (average size = 3.86 nm) on nanosheets have benefitted towards faster electrolyte diffusion, easy gas escape from catalyst surface to support high electrocatalytic performance. Finally, well-maintained morphology of the sample and evolution of HER active sites in the material have guaranteed long-term, sustainable hydrogen production even at high current densities, which clearly demonstrate its superiority over an expensive electrolyzer (Pt-C) in alkaline water.

Original languageEnglish
Article number104245
JournalNano Energy
Volume67
DOIs
Publication statusPublished - Jan 2020
Externally publishedYes

Keywords

  • Durability
  • Holey nanosheets
  • Hydrogen evolution reaction
  • Lower overpotential
  • Metal boride

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