Journal
CHEMELECTROCHEM
Volume 7, Issue 1, Pages 336-346Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/celc.201901870
Keywords
MoS2; anion doping; hydrogen evolution reaction; electrochemical impedance spectroscopy; distribution of relaxation time
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Hydrogen evolution reaction (HER) was improved through nitrogen (N) doping in molybdenum disulfide (MoS2) due to the formation of 1T-metallic phase as compared to the thermodynamically stable 2H-semiconducting phase. Generally, the phase transition of MoS2 from semiconducting 2H to metallic 1T was carried out by chemical intercalation method. A facile solvothermal synthetic procedure is used to organize 1T@2H MoS2 nanoflower by incorporating N in MoS2 crystal lattice which improved the catalytic activity with the generation of metallic property of MoS2. Optimized N doping is an effective strategy for the development of mixed phase MoS2. Physicochemical characterization techniques confirmed the formation of hybrid phase (1T@2H) MoS2 by N incorporation. A tuned dopant concentration in MoS2 crystal lattice effectively enhanced the catalytic performance by modifying the physical and chemical properties. Moreover, optimal N doped MoS2 offered a very low overpotential of similar to 108 and similar to 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.
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