空心碳球负载的二硫化钼纳米片作为高效的电化学析氢反应催化剂
MoS Nanosheets Supported on Hollow Carbon Spheres as Efficient Catalysts for Electrochemical Hydrogen Evolution Reaction.
作者信息
Li Wenyue, Zhang Zhenyu, Zhang Wenjun, Zou Shouzhong
机构信息
Department of Chemistry, American University, 4400 Massachusetts Avenue NW, Washington, DC 20016, United States.
Department of Physics and Materials Science, Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Tat Chee Avenue, Kowloon 999077, Hong Kong, China.
出版信息
ACS Omega. 2017 Aug 29;2(8):5087-5094. doi: 10.1021/acsomega.7b00755. eCollection 2017 Aug 31.
Hybridizing structured carbon materials with MoS has been demonstrated to be an effective method to increase the electrochemical hydrogen evolution reaction (HER) activity and durability of MoS. In this study, we report the growth of MoS nanosheets on the surface of uniform hollow carbon spheres (HCS) to form a hydrangea-like nanocomposite. The HCS were formed through carbonization of a phenol formaldehyde template, and the MoS nanosheets were grown on the HCS surfaces through a hydrothermal method. The nanocomposites have the advantages of significantly improved electrical conductivity, ease of varying the MoS loading, and minimizing stacking of MoS nanosheets, which are manifested by their remarkably improved HER performance. The well-tuned carbon-MoS composite shows a Tafel slope of 48.9 mV dec, an onset potential of -0.079 V (vs reversible hydrogen electrode), and an overpotential of 126 mV at the current density of 10 mA cm after 1000 potential cycles.
将结构化碳材料与二硫化钼（MoS）杂交已被证明是提高MoS的电化学析氢反应（HER）活性和耐久性的有效方法。在本研究中，我们报道了在均匀空心碳球（HCS）表面生长MoS纳米片以形成绣球花状纳米复合材料。HCS通过酚醛模板碳化形成，MoS纳米片通过水热法在HCS表面生长。该纳米复合材料具有显著提高的电导率、易于改变MoS负载量以及使MoS纳米片的堆叠最小化等优点，这些优点通过其显著提高的HER性能得以体现。经过良好调谐的碳 - MoS复合材料在1000次电位循环后，在电流密度为10 mA cm时，塔菲尔斜率为48.9 mV dec，起始电位为 - 0.079 V（相对于可逆氢电极），过电位为126 mV。
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