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Doping‐Assisted Phase Changing Effect on MoS 2 Towards Hydrogen Evolution Reaction in Acidic and Alkaline pH
Author(s) -
Bolar Saikat,
Shit Subhasis,
Murmu Naresh C.,
Kuila Tapas
Publication year - 2020
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201901870
Subject(s) - overpotential , materials science , molybdenum disulfide , dopant , doping , catalysis , chemical engineering , electrocatalyst , intercalation (chemistry) , nanotechnology , metal , inorganic chemistry , chemistry , optoelectronics , organic chemistry , electrochemistry , electrode , metallurgy , engineering
Hydrogen evolution reaction (HER) was improved through nitrogen (N) doping in molybdenum disulfide (MoS 2 ) due to the formation of 1T‐metallic phase as compared to the thermodynamically stable 2H‐semiconducting phase. Generally, the phase transition of MoS 2 from semiconducting 2H to metallic 1T was carried out by chemical intercalation method. A facile solvothermal synthetic procedure is used to organize 1T@2H MoS 2 nanoflower by incorporating N in MoS 2 crystal lattice which improved the catalytic activity with the generation of metallic property of MoS 2 . Optimized N doping is an effective strategy for the development of mixed phase MoS 2 . Physicochemical characterization techniques confirmed the formation of hybrid phase (1T@2H) MoS 2 by N incorporation. A tuned dopant concentration in MoS 2 crystal lattice effectively enhanced the catalytic performance by modifying the physical and chemical properties. Moreover, optimal N doped MoS 2 offered a very low overpotential of ∼108 and ∼141 mV to reach the benchmarking current density of 10 mA cm −2 for HER in acidic and basic medium, respectively. This work elucidated a rational implantation of phase engineering, which is an efficient strategy to develop efficient electrocatalysts, shedding light on the improvement of transition metal‐based electrocatalyst in renewable energy technologies.