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Strained W(SexS1–x)2 Nanoporous Films for Highly Efficient Hydrogen Evolution

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journal contribution
posted on 08.05.2017, 00:00 by Kun Liang, Yong Yan, Limin Guo, Kyle Marcus, Zhao Li, Le Zhou, Yilun Li, Ruquan Ye, Nina Orlovskaya, Yong-Ho Sohn, Yang Yang
A W­(SexS1–x)2 nanoporous architecture (NPA) was developed by facile anodic and chemical vapor deposition treatments. The ternary W­(SexS1–x)2 NPA offers significant advantages toward high-efficiency hydrogen generation: (i) Nanoporous morphology provides more electrochemically active sites to split water. (ii) Lattice mismatch and disordering in the mix-phased W­(SexS1–x)2 film introduce more defects to enhance the catalytic activity. (iii) Conducting 1T phase formed in the strained W­(SexS1–x)2 facilitates the electron transfer during catalytic reactions. Therefore, an onset overpotential of 45 mV and a Tafel slope of 59 mV dec–1 were achieved using the as-prepared W­(SexS1–x)2 NPA.