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Molybdenum sulfide, MoSx, is considered as attractive hydrogen evolution catalyst since it is free of noble metals and shows a low overpotential. Especially, amorphous molybdenum sulfide has attracted attention because of its high catalytic activity. However, the catalytic mechanism of the hydrogen evolution reaction is not yet fully understood. Therefore, in our study, layers of MoSx were deposited by reactive magnetron sputtering, varying the substrate temperature in the range from room temperature (RT) to 500 °C. The morphology and structure of the films change significantly as a function of temperature, from an amorphous to a highly textured 2H-MoS2 phase. The highest catalytic activity was found for amorphous layers deposited at RT, showing an overvoltage of 180 mV at a current density of −10 mA cm–2 in a 0.5 M sulfuric acid electrolyte (pH 0.3) after electrochemical activation. As detected by Raman spectroscopy, the RT deposited catalyst consists of [Mo3S13]2– and [Mo3S12]2– entities which are inter...

acs catalysis

Structural Transformation Identification of Sputtered Amorphous MoS<sub><i>x</i></sub> as an Efficient Hydrogen-Evolving Catalyst during Electrochemical Activation

Structural Transformation Identification of Sputtered Amorphous MoSx as an Efficient Hydrogen-Evolving Catalyst during Electrochemical Activation

Structural Transformation Identification of Sputtered Amorphous MoS_x as an Efficient Hydrogen-Evolving Catalyst during Electrochemical Activation