We demonstrate electrochemical cycling-induced reduction of MoO to monoclinic molybdenum dioxide and molybdenum sub-oxides (MoO), which exhibit excellent electrochemical hydrogen evolution reaction (HER) activity. The conversion of MoO 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 MoO morphology and size on the electrochemical reduction of MoO was also studied.
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| http://dx.doi.org/10.1039/c6cc09187c | DOI Listing |
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