Enhanced Catalytic Activities of Surfactant-Assisted Exfoliated WS2 Nanodots for Hydrogen Evolution

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• 作者：Xue Zhao ; Xiao Ma ; Jian Sun ; Dehui Li ; Xiurong Yang
• 刊名：ACS Nano
• 出版年：2016
• 出版时间：February 23, 2016
• 年：2016
• 卷：10
• 期：2
• 页码：2159-2166
• 全文大小：440K
• ISSN：1936-086X

文摘

WS₂ nanodots were prepared by liquid-phase exfoliation of bulk WS₂ crystals in surfactant aqueous solution with the aid of ultrasonication. Their behaviors on catalyzing hydrogen evolution reaction (HER) were investigated after drop-casting them onto a glass carbon electrode. On the basis of the optical and electron characterizations, the nanodots were identified with a high concentration of octahedral phase of WS₂ that showed better catalysis properties than the hexagonal WS₂. From the polarization curve, the Tafel slope was estimated to be 51 mV per decade and the onset potential was 90 mV, indicating good catalytic performance of such nanodots. Our results suggest that surfactant-mediated exfoliation is an environmentally benign method to synthesize WS₂ nanodots for improved catalyzing HER.