High Active and Durable Vanadium Sulfide Multilayer Structure Featuring Rich Hole Defects Constructed for Accelerated Hydrogen Evolution Reaction
High Active and Durable Vanadium Sulfide Multilayer Structure Featuring Rich Hole Defects Constructed for Accelerated Hydrogen Evolution Reaction
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DOI：
10.1149/1945-7111/aba970
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发表时间：
2020-08
影响因子：
3.9
通讯作者：
X. Xia;Gaiyun Zhao;Z. Hou;Chun Yuan;Lina Sun;Cong Han
中科院分区：
文献类型：
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作者：
X. Xia;Gaiyun Zhao;Z. Hou;Chun Yuan;Lina Sun;Cong Han
VS 2纳米材料具有特殊的形貌、暴露的边缘和缺陷，是一种廉价、活性高的析氢电催化剂。在这里，我们报道了多层Waffle结构的具有丰富空穴缺陷的VS 2（VS 2 MLW）的制备.该结构显示出优异的电催化HER动力学指标，在− 10 mA cm− 2的电流密度下表现出82 mV的过电位，61 mV dec− 1的塔菲尔斜率，以及没有任何电流衰减的长期稳定性。其HER性能远优于其他V基催化剂，甚至可与商业Pt/C相媲美。通过实验和理论计算，将VS 2 MLW优异的电催化活性归因于其特殊的形貌和电子结构。这种结构中的空穴缺陷为HER提供了更大的电化学活性面积和更多的活性位点，更重要的是，空穴缺陷改变了催化剂的电子结构，降低了氢吸附自由能，优化的自由能导致VS 2 MLW的固有催化活性提高。本工作为通过比表面积和缺陷工程设计高效HER催化剂提供了新的思路。
VS 2 nanomaterials with special morphology, exposed edges, defects have studied as an active and inexpensive electrocatalyst for hydrogen evolution reaction (HER). Here, we reported the fabrication of multilayer Waffle structured VS 2 featuring rich hole defects (VS 2 MLW). This structure shows excellent kinetic metrics for electrocatalytic HER, exhibiting a overpotential of 82 mV at the current density of− 10 mA cm− 2, a Tafel slope of 61 mV dec− 1, and a long-term stability without any current fading. Its HER performance is much better than that of other V-based catalysts, and even comparable to that of commercial Pt/C. Through experimental and theoretical calculation, the outstanding electrocatalytic activity of the VS 2 MLW is attributed to its special morphology and electronic structure. The hole defects in this structure provide larger electrochemical active area and more active sites for HER, more importantly, hole defects change the electron structure of catalyst and reduce the free energy of hydrogen adsorption, the optimized free energy consequently leading to the improved inherent catalytic activity of VS 2 MLW. This work provides a new concept to design efficient HER catalyst by specific surface area and defect engineering.