Amorphous CoMoS x /N-Doped Carbon Hybrid with 3D Networks as Electrocatalysts for Hydrogen Evolution
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Amorphous CoMoSx/N‑Doped Carbon Hybrid with 3D Networks as Electrocatalysts for Hydrogen Evolution Shuang Wang1 · Xingbo Ge1 · Juyi Xiao1 · Lieyuan Huang1 · Jia Liu1 · Jing Wu1 · Wenjian Yue1 · Xianhui Yang1 Received: 11 October 2019 / Accepted: 8 October 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Catalytic materials without using precious metallic elements for electrocatalytic water splitting are a crucial demand to the renewable energy production. Cobalt molybdenum sulfide (CoMoSx) is one of the promising candidates for such purpose. Yet, the sparse catalytic active sites and poor electrical conductivity limit its catalytic performance. Here, we presented an efficient strategy to synthesize amorphous cobalt molybdenum supported on tree-dimensional network N-doped carbon nanofibers (CoMoSx/NCNFs) with the enlarged surface area. The obtained catalysts were characterized by scanning electron microscope (SEM), Transmission electron microscopy (TEM), powder X-ray diffraction (XRD), X-ray photoelectron spectrometer (XPS) and energy-dispersive X-ray spectroscopy (EDS) methods, and the catalytic activity was evaluated by electrochemical technique. In contrast to large aggregate CoMoSx particles grown on carbon paper electrode without NCNFs, CoMoSx/NCNFs/CP hybrid materials possess porous structure with an abundance of exposed active sites stacked onto NCNF surface. Benefiting from the synergistic effect between the amorphous CoMoSx and the underlying NCNF network, CoMoSx/NCNFs hybrid exhibits an excellent activity for hydrogen evolution reaction (HER) with a low onset overpotential of 117 mV, a Tafel slope of 75 mV/decade, and good stability. Graphic Abstract
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10562-020-03428-0) contains supplementary material, which is available to authorized users. Extended author information available on the last page of the article
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Keywords Electrodeposition · Cobalt molybdenum sulfide · Carbon material · Electrocatalyst · Hydrogen evolution reaction
1 Introduction Hydrogen, as a clean energy carrier, represents one of the most promising alternatives to fossil fuel [1]. The hydrogen evolution reaction (HER) from electrochemical water splitting is an effective process to generate sustainable H2 gas. At present, the most active electrocatalysts are Pt-group metals, which have a low onset overpotential and Tafel slope for efficient energy conversion [2]. However, the high-cost and shortage reserves limited their large-scale commercial application [3–5]. Thus, it is urgent to develop highly efficient non-noble electrocatalysts to reduce the overpotential and consequently accelerate the efficiency of this electrochemical process. In recent years, M oS2 have been attracted enormous researches from a hydride sulfurization catalyst to a HER electrocatalyst due to the fact that its catalytic active sites are confirmed by theoretical and experimenta
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