| Title |
S-containing molybdenum oxide films as pH neutral hydrogen evolution electrocatalyst prepared by electrodeposition / |
| Authors |
Mardosaitė, Rasa ; Valatka, Eugenijus |
| DOI |
10.20964/2019.01.37 |
| Full Text |
|
| Is Part of |
International journal of electrochemical science.. Belgrade : Electrochemical science group. 2019, vol. 14, iss. 1, p. 387-401.. eISSN 1452-3981 |
| Keywords [eng] |
electrodeposition ; hydrogen evolution reaction ; molybdenum oxide ; molybdenum sulfide ; thiourea |
| Abstract [eng] |
Molybdenum sulfides, molybdenum oxides, and S-containing molybdenum oxides have been shown to be promising electrocatalysts for hydrogen evolution. In this context, amorphous Mo-O-S films on a fluorine-doped tin oxide (FTO) substrate were prepared by cyclic voltammetry using two different electrodeposition baths containing different Mo and S precursors. Although ammonium tetrathiomolybdate (ATTM) was successfully used as a source for Mo and S, this precursor was identified as having some limitations. Therefore, an alternative electrodeposition bath containing thiourea and ammonium molybdate was presented in this work. Amorphous thiourea-molybdate-based films were annealed under an inert atmosphere, and the thermal effect was subsequently evaluated by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), UV-Vis, and Raman analysis. Finally, harsh galvanostatic electrolysis conditions were applied to perform a preliminary evaluation of the catalytic behaviour of the Mo-O-S films in a phosphate buffer solution (pH 7). The Mo-O-S films prepared from the thiourea-molybdate bath showed promising stability and activity results, with a Tafel slope of 85 mV·dec-1 in the range of overpotentials lower than 100 mV even after prolonged HER operation. These findings open an alternative approach to the possible mechanism of Mo-O-S formation. |
| Published |
Belgrade : Electrochemical science group |
| Type |
Journal article |
| Language |
English |
| Publication date |
2019 |
| CC license |
|
