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In situ electro-oxidation modulation of Ru(OH)x/Ag supported on nickel foam for efficient hydrogen evolution reaction in alkaline media.
- Source :
-
International Journal of Hydrogen Energy . Aug2019, Vol. 44 Issue 39, p21683-21691. 9p. - Publication Year :
- 2019
-
Abstract
- Transition metal hydroxides for hydrogen evolution reaction (HER) usually have been limited by poor intrinsic activity and weak conductivity. In our work, in situ electro-oxidation as an effective way has been used to modulate the electronic states of active sites for ruthenium hydroxides, which provides obviously enhanced activity for HER in alkaline media. Ag-modified nickel foam (NF) as substrate can provide the excellent conductivity to improve the charge transfer rate of Ru(OH) x /Ag/NF. In situ electro-oxidation process has been conducted for Ru(OH) x /Ag/NF through OER measurements in alkaline media, which results in the formation of more Ru (IV) as higher actives sites for HER. Compared to Ru(OH) x /NF, X-ray photoelectron spectroscopy (XPS) and polarization curves prove that Ag doping in Ru(OH) x /Ag/NF may contribute to the oxidization of ruthenium from Ru (III) to Ru (IV) during in situ electro-oxidation. The obtained Ru(OH) x /Ag/NF exhibits Pt-like HER activity with a very low overpotential of 103.2 mV to drive 100 mA cm−2 in 1.0 M KOH. The excellent stability of Ru(OH) x /Ag/NF has also been demonstrated. Therefore, our work provides a new strategy by modulating valence state of active sites for transition metal hydroxides for efficient HER. Image 1 • Ru(OH) x /Ag/NF was prepared by in situ electro-oxidation process. • Ag doping contributes to the oxidization of ruthenium from Ru (III) to Ru (IV). • Ru(OH) x /Ag/NF exhibits Pt-like HER activity and good stability. • In situ electro-oxidation is an effective way to modulate the electronic states of active sites. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03603199
- Volume :
- 44
- Issue :
- 39
- Database :
- Academic Search Index
- Journal :
- International Journal of Hydrogen Energy
- Publication Type :
- Academic Journal
- Accession number :
- 137947022
- Full Text :
- https://doi.org/10.1016/j.ijhydene.2019.06.116