Highly porous Ag-Ag2S/MoS2 with additional active sites synthesized by chemical etching method for enhanced electrocatalytic hydrogen evolution
Highly porous Ag-Ag2S/MoS2 with additional active sites synthesized by chemical etching method for enhanced electrocatalytic hydrogen evolution
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DOI：
10.1016/j.electacta.2014.07.129
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发表时间：
2014-10
影响因子：
6.6
通讯作者：
X. Xia;Xiaojuan Zhao;Weichun Ye;Chunming Wang
中科院分区：
文献类型：
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作者：
X. Xia;Xiaojuan Zhao;Weichun Ye;Chunming Wang
采用化学腐蚀法制备了多孔结构的Ag-Ag 2S/MoS 2复合材料，并对其在析氢反应中的应用进行了研究。通过广泛的光谱和电化学表征，研究了这种Ag-Ag 2S/MoS 2复合材料催化活性的起源，并了解了这种材料对HER的性能。在合成过程中，半胱氨酸（Cys）被用来增加高催化性S边缘的数量，这一点通过低Mo/S比来揭示。粗糙多孔的表面结构导致的高密度的活性中心也有助于高催化活性。随着材料形貌由相对完整的片层结构向多孔结构的转变，催化剂对HER的催化活性逐渐提高。电化学稳定性测试表明，该催化剂在整个长期运行中保持高度活性。我们对这种高活性析氢催化剂的进一步了解可能有助于开发经济的电化学制氢系统。
Porous structured Ag-Ag2S/MoS2composite was synthesized by a facile chemical etching method and tested with respect to its application in hydrogen evolution reaction (HER). Extensive spectroscopic and electrochemical characterizations were performed to investigate the origin of the catalytic activity of this Ag-Ag2S/MoS2composite and understand the property of this material for HER. During the synthesis process, cysteine (Cys) was used to improve the number of highly catalytic S edges as revealed by a low ratio of Mo to S. The high density of active sites that result from the rough and porous structure surface morphology also contributes to the highly catalytic activity. The catalytic activity for HER increases with the change of material morphology from a relatively complete lamellar structure to the porous structure. The electrochemical stability tests indicate that the catalyst remains highly active throughout prolonged operation. Our enhanced understanding of this highly active hydrogen evolution catalyst may facilitate the development of economical electrochemical hydrogen production systems.