Proceedings of nanoGe September Meeting 2017 (NFM17)
Publication date: 20th June 2016
Hydrogen evolution reaction (HER) via water splitting through electrocatalysis using advanced inexpensive materials to replace precious platinum catalysts holds great promise for clean energy technology. Here, we developed highly active and stable Co-Sn-Sx catalysts with abundant exposed edges hybridized with graphene via facile hydrothermal process followed by low temperature thermal annealing for HER in acidic electrolytes. The Co0.5Sn0.5S2-x hybrid exhibited a lowest overpotential of 37 mV at 10 mA cm-2, small Tafel slope of 62 mV dec-1, and long-term stability over 40 h for continuous HER operation at lowest mass loadings (1.5 mg/cm2). These results confirmed the Co0.5Sn0.5S2-x hybrid have outstanding performance compared to that of Pt/C and other reported transition metal catalysts. The origin of enhanced HER activity is because of lower energy barrier formed by favorable d-orbitals of transition metals and the s-orbitals of H atoms. Thus, the insertion of Co atoms in Sn-S atomic structure plays a crucial role in tuning its intrinsic electronic structures creating abundant defects, vacancies and edges. This strategy offers a scalable, cost effective, and highly efficient HER catalyst as an alternative to replace noble metal catalysts for practical hydrogen production.
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