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The role of metal dopants in WS2 nanoflowers in enhancing the hydrogen evolution reaction

Authors: Amirhossein Hasani, Thang Phan Nguyen, Mahider Tekalgne, Quyet Van Le, Kyoung Soon Choi, Tae Hyung Lee, Tae Jung Park, Ho Won Jang, Soo Young Kim
Publication date: 2018/10/25
Journal: Applied Catalysis A: General
Volume: 567
Pages: 73-79
Publisher: Elsevier
We demonstrate a facile and efficient method for the synthesis of a metal-doped WS2nanoflower (NF) catalyst. We also report its application for the electrocatalytic hydrogen evolution reaction (HER). The flower-like WS2 particles were produced by a hydrothermal reaction, and, subsequently, the WS2 was doped with metal chlorides such as AuCl3, AgCl, PtCl2, and PdCl2, followed by reduction with sodium borohydride to form metal-doped WS2 NFs. The Pd-doped WS2 NF catalyst showed a high HER performance, having a Tafel slope of 54 mV/dec and an overpotential of -175 mV at −10 mA cm−2. The improvement is attributed to the energy band alignment near the H+/H2reduction potential and the large surface area of the WS2 NFs.

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