Hot Electron of Au Nanorods Activates the Electrocatalysis of Hydrogen Evolution on MoS2 Nanosheets

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• 作者：Yi Shi ; Jiong Wang ; Chen Wang ; Ting-Ting Zhai ; Wen-Jing Bao ; Jing-Juan Xu ; Xing-Hua Xia ; Hong-Yuan Chen
• 刊名：Journal of the American Chemical Society
• 出版年：2015
• 出版时间：June 17, 2015
• 年：2015
• 卷：137
• 期：23
• 页码：7365-7370
• 全文大小：338K
• ISSN：1520-5126

文摘

Efficient water splitting through electrocatalysis holds great promise for producing hydrogen fuel in modern energy devices. Its real application however suffers from sluggish reaction kinetics due to the lack of high-performance catalysts except noble metals such as platinum. Herein, we report an active system of plasmonic-metal Au nanorods/molybdenum disulfide (MoS₂) nanosheets hybrids for the hydrogen evolution reaction (HER). The plasmonic Au鈥揗oS₂ hybrids dramatically improve the HER, leading to a 鈭?-fold increase of current under excitation of Au localized surface plasmon resonance (LSPR). A turnover of 8.76 s^鈥? at 300 mV overpotential is measured under LSPR excitation, which by far exceeds the activity of MoS₂ catalysts reported recently. The HER enhancement can be largely attributed to the increase of carrier density in MoS₂ induced by the injection of hot electrons of Au nanorods. We demonstrate that the synergistic effect of the hole scavengers can further facilitate electron鈥揾ole separation, resulting in a decrease of the overpotential of HER at MoS₂ to 鈭?20 mV. This study highlights how metal LSPR activates the HER and promises novel opportunities for enhancing intrinsic activities of semiconducting materials.