1. Electrochemical cycling and beyond: unrevealed activation of MoO3 for electrochemical hydrogen evolution reactions
- Author
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Pitchai Thangasamy, D. Jeyakumar, Nagarajan Ilayaraja, and Marappan Sathish
- Subjects
Chemistry ,Inorganic chemistry ,Metals and Alloys ,chemistry.chemical_element ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Electrochemistry ,01 natural sciences ,Redox ,Catalysis ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,chemistry.chemical_compound ,Molybdenum ,Materials Chemistry ,Ceramics and Composites ,Hydrogen evolution ,0210 nano-technology ,Cycling ,Current density ,Molybdenum dioxide ,Monoclinic crystal system - Abstract
We demonstrate electrochemical cycling-induced reduction of MoO3 to monoclinic molybdenum dioxide and molybdenum sub-oxides (MoO3-x), which exhibit excellent electrochemical hydrogen evolution reaction (HER) activity. The conversion of MoO3 during cycling was probed; after 250 cycles, the redox peaks were found to diminish with an onset potential shift and increased HER current density. At 400 cycles, the insertion/deinsertion processes observed in the initial cycles are completely absent and the HER current density is enhanced to the maximum. The effect of MoO3 morphology and size on the electrochemical reduction of MoO3 was also studied.
- Published
- 2017