title: Electrochemical cycling and beyond: unrevealed activation of MoO3for electrochemical hydrogen evolution reactions.
abstract: We demonstrate electrochemical cycling-induced reduction of MoO3to monoclinic molybdenum dioxide and molybdenum sub-oxides (MoO3-x), which exhibit excellent electrochemical hydrogen evolution reaction (HER) activity. The conversion of MoO3during 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 MoO3morphology and size on the electrochemical reduction of MoO3was also studied.
authors.affiliation: Functional Materials Division, CSIR-Central Electrochemical Research Institute, Karaikudi - 630 003, India. marappan.sathish@gmail.com msathish@cecri.res.in duraisamyjeyakumar@gmail.com and Academy of Scientific and Innovative Research (AcSIR), CSIR-Central Electrochemical Research Institute, Karaikudi - 630 003, India.
authors.forename: Pitchai
authors.identifier: http://orcid.org/0000-0002-9513-1964
authors.initials: P
authors.lastname: Thangasamy
authors.affiliation: Functional Materials Division, CSIR-Central Electrochemical Research Institute, Karaikudi - 630 003, India. marappan.sathish@gmail.com msathish@cecri.res.in duraisamyjeyakumar@gmail.com.
authors.forename: Nagarajan
authors.initials: N
authors.lastname: Ilayaraja
authors.affiliation: Functional Materials Division, CSIR-Central Electrochemical Research Institute, Karaikudi - 630 003, India. marappan.sathish@gmail.com msathish@cecri.res.in duraisamyjeyakumar@gmail.com.
authors.forename: Duraisamy
authors.initials: D
authors.lastname: Jeyakumar
authors.affiliation: Functional Materials Division, CSIR-Central Electrochemical Research Institute, Karaikudi - 630 003, India. marappan.sathish@gmail.com msathish@cecri.res.in duraisamyjeyakumar@gmail.com and Academy of Scientific and Innovative Research (AcSIR), CSIR-Central Electrochemical Research Institute, Karaikudi - 630 003, India.
authors.forename: Marappan
authors.identifier: http://orcid.org/0000-0001-9094-5822
authors.initials: M
authors.lastname: Sathish