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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 undated 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 voltammeter (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.
Original language | English |
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Pages (from-to) | 6008-6017 |
Number of pages | 10 |
Journal | ACS Catalysis |
Volume | 6 |
Issue number | 9 |
Early online date | 2 Aug 2016 |
DOIs | |
Publication status | Published - 2 Sept 2016 |
Keywords
- doping
- hydrogen evolution
- magnetron sputtering deposition
- molybdenum disulfide
- nanoclusters
- STEM
Fingerprint
Dive into the research topics of 'Enhancement of the hydrogen evolution reaction from Ni-MoS2 hybrid nanoclusters'. Together they form a unique fingerprint.Projects
- 2 Finished
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Establish Career Fellowship Professor Richard Palmer - Super-Abundant Size-Selected Cluister Technology for Nanoscale Design of Functional Materials
Palmer, R. (Principal Investigator)
Engineering & Physical Science Research Council
1/01/13 → 28/02/17
Project: Research
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Materials Program Platform Grant : Nanostructured Surfaces
Palmer, R. (Principal Investigator), Guo, Q. (Co-Investigator), Li, Z. (Co-Investigator), Kaplan, A. (Co-Investigator) & Robinson, A. (Co-Investigator)
Engineering & Physical Science Research Council
1/07/07 → 31/12/11
Project: Research Councils