Liu Zhenjing, Ou Xuewu, Zhuang Minghao, Li Jiadong, Hossain Md Delowar, Ding Yao, Wong Hoilun, You Jiawen, Cai Yuting, Abidi Irfan Haider, Tyagi Abhishek, Shao Minhua, Yuan Bin, Luo Zhengtang
Department of Chemical and Biological Engineering, William Mong Institute of Nano Science and Technology and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction , The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon 999077 , Hong Kong.
School of Materials Science and Engineering , South China University of Technology , Guangzhou , Guangdong 510640 , China.
ACS Appl Mater Interfaces. 2019 Aug 28;11(34):31147-31154. doi: 10.1021/acsami.9b08157. Epub 2019 Aug 14.
To enhance interlayer lithium diffusion, we engineer electrodes consisting of epitaxially grown ReSe nanosheets by chemical vapor deposition, supported on three-dimensional (3D) graphene foam, taking advantage of its weak van der Waals coupling and anisotropic crystal structure. We further demonstrate its excellent performance as the anode for lithium-ion battery and catalyst for hydrogen evolution reaction (HER). Density functional theory calculation reveals that ReSe exhibits a low energy barrier for lithium (Li) interlayer diffusion because of negligible interlayer coupling and anisotropic structure with low symmetry that creates additional adsorption sites and leads to a reduced diffusion barrier. Benefitting from these properties, the 3D ReSe/graphene foam electrode displays excellent cycling and rate performance with 99.6% capacity retention after 350 cycles and a capacity of 327 mA h g at the current density of 1000 mA g. Additionally, it has exhibited a high activity for HER, in which an exchange current density of 277.8 μA cm is obtained and only an overpotential of 106 mV is required to achieve a current density of -10 mA cm. Our work provides a fundamental understanding of the interlayer diffusion of Li in transition-metal dichalcogenide (TMD) materials and acts as a new tool for designing a TMD-based catalyst.
为了增强层间锂扩散，我们利用化学气相沉积法制备了由外延生长的ReSe纳米片组成的电极，这些纳米片负载在三维（3D）石墨烯泡沫上，利用其较弱的范德华耦合和各向异性晶体结构。我们进一步证明了其作为锂离子电池阳极和析氢反应（HER）催化剂的优异性能。密度泛函理论计算表明，由于层间耦合可忽略不计以及具有低对称性的各向异性结构创造了额外的吸附位点并导致扩散势垒降低，ReSe对锂（Li）的层间扩散表现出较低的能垒。受益于这些特性，3D ReSe/石墨烯泡沫电极展现出优异的循环性能和倍率性能，在350次循环后容量保持率为99.6%，在1000 mA g的电流密度下容量为327 mA h g。此外，它对HER表现出高活性，其中获得的交换电流密度为277.8 μA cm，仅需106 mV的过电位即可实现-10 mA cm的电流密度。我们的工作为理解锂在过渡金属二硫属化物（TMD）材料中的层间扩散提供了基础认识，并成为设计基于TMD的催化剂的新工具。
