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Title: Plasmonic-induced overgrowth of amorphous molybdenum sulfide on nanoporous gold : an ambient synthesis method of hybrid nanoparticles with enhanced electrocatalytic activity
Authors: Phan-Quang, Gia Chuong
Yang, Zhe
Koh, Charlynn Sher Lin
Sim, Howard Yi Fan
Leong, Shi Xuan
Ling, Xing Yi
Keywords: Science::Physics
Issue Date: 2019
Source: Phan-Quang, G. C., Yang, Z., Koh, C. S. L., Sim, H. Y. F., Leong, S. X., & Ling, X. Y. (2019). Plasmonic-induced overgrowth of amorphous molybdenum sulfide on nanoporous gold : an ambient synthesis method of hybrid nanoparticles with enhanced electrocatalytic activity. The Journal of Chemical Physics, 151(24), 244709-. doi:10.1063/1.5130649
Journal: The Journal of Chemical Physics
Abstract: Hybrid materials of earth abundant transition metal dichalcogenides and noble metal nanoparticles, such as molybdenum sulfide (MoSx) and gold nanoparticles, exhibit synergistic effects that can enhance electrocatalytic reactions. However, most current hybrid MoSx-gold synthesis requires an energy intensive heat source of >500 °C or chemical plating to achieve deposition of MoSx on the gold surface. Herein, we demonstrate the direct overgrowth of MoSx over colloidal nanoporous gold (NPG), conducted feasibly under ambient conditions, to form hybrid particles with enhanced electrocatalytic performance toward hydrogen evolution reaction. Our strategy exploits the localized surface plasmon resonance-mediated photothermal heating of NPG to achieve >230 °C surface temperature, which induces the decomposition of the (NH4)2MoS4 precursor and direct overgrowth of MoSx over NPG. By tuning the concentration ratio between the precursor and NPG, the amount of MoSx particles deposited can be systematically controlled from 0.5% to 2% of the Mo/(Au + Mo) ratio. Importantly, we find that the hybrid particles exhibit higher bridging and an apical S to terminal S atomic ratio than pure molybdenum sulfide, which gives rise to their enhanced electrocatalytic performance for hydrogen evolution reaction. We demonstrate that hybrid MoSx-NPG exhibits >30 mV lower onset potential and a 1.7-fold lower Tafel slope as compared to pure MoSx. Our methodology provides an energy- and cost-efficient synthesis pathway, which can be extended to the synthesis of various functional hybrid structures with unique properties for catalysis and sensing applications.
ISSN: 0021-9606
DOI: 10.1063/1.5130649
Rights: © 2019 Author(s). All rights reserved. This paper was published by American Institute of Physics Publishing in The Journal of Chemical Physics and is made available with permission of Author(s).
Fulltext Permission: embargo_20210103
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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