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Enhancement of the Hydrogen Evolution Reaction from Ni-MoS2 Hybrid Nanoclusters

Daniel Escalera-López, Yubiao Niu, Jinlong Yin, Kevin Cooke, Neil V. Rees, Richard Palmer Orcid Logo

ACS Catalysis, Volume: 6, Issue: 9, Pages: 6008 - 6017

Swansea University Author: Richard Palmer Orcid Logo

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Abstract

This report focuses on a novel strategy for the preparation of transition metal–MoS2 hybrid nanoclusters based on a one-step, dual-target magnetron sputtering, and gas condensation process demonstrated for Ni-MoS2. Aberration-corrected STEM images coupled with EDX analysis confirms the presence of N...

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Published in: ACS Catalysis
ISSN: 2155-5435 2155-5435
Published: 2016
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa49229
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Abstract: This report focuses on a novel strategy for the preparation of transition metal–MoS2 hybrid nanoclusters based on a one-step, dual-target magnetron sputtering, and gas condensation process demonstrated for Ni-MoS2. Aberration-corrected STEM images coupled with EDX analysis confirms the presence of Ni and MoS2 in the hybrid nanoclusters (average diameter = 5.0 nm, Mo:S ratio = 1:1.8 ± 0.1). The Ni-MoS2 nanoclusters display a 100 mV shift in the hydrogen evolution reaction (HER) onset potential and an almost 3-fold increase in exchange current density compared with the undoped MoS2 nanoclusters, the latter effect in agreement with reported DFT calculations. This activity is only reached after air exposure of the Ni-MoS2 hybrid nanoclusters, suggested by XPS measurements to originate from a Ni dopant atoms oxidation state conversion from metallic to 2+ characteristic of the NiO species active to the HER. Anodic stripping voltammetry (ASV) experiments on the Ni-MoS2 hybrid nanoclusters confirm the presence of Ni-doped edge sites and reveal distinctive electrochemical features associated with both doped Mo-edge and doped S-edge sites which correlate with both their thermodynamic stability and relative abundance.
Keywords: doping; hydrogen evolution; magnetron sputtering deposition; molybdenum disulfide; nanoclusters; STEM
College: College of Engineering
Issue: 9
Start Page: 6008
End Page: 6017