School of Material Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore.
Nanoscale. 2018 Mar 8;10(10):4890-4896. doi: 10.1039/c7nr08745d.
The construction of two-dimensional (2D) ultrathin nanosheets is considered as a promising strategy for enhancing electrochemical performance, owing to their large surface area and fast electron transport. In this study, ultrathin few-layer NiPS nanosheets are obtained and systematically investigated by high-yield liquid phase exfoliation from their bulk layered crystals, and are exploited as anodes for lithium ion batteries (LIBs) and electrocatalysts for oxygen evolution reaction (OER). When evaluated as an anode for LIBs, NiPS nanosheets show excellent electrochemical properties in terms of stable cycling performance and rate capabilities. A stable reversible capacity of 796.2 mA h g is delivered after the 150 cycle at a current density of 100 mA g. As for the OER, the exfoliated few-layer NiPS nanosheets have demonstrated excellent electrocatalytic performance, such as a low overpotential of 301 mV at a current density of 10 mA cm, a small Tafel slope of 43 mV dec, and an outstanding long-term durability. This work is expected to make a contribution to develop next generation high-performance electrochemically active materials for catalysts and batteries.
二维（2D）超薄纳米片的构建被认为是一种增强电化学性能的有前途的策略，因为它们具有较大的表面积和快速的电子传输。在这项研究中，通过从其体相层状晶体进行高产液相剥离，获得了超薄少层 NiPS 纳米片，并将其作为锂离子电池（LIBs）的阳极和析氧反应（OER）的电催化剂进行了系统研究。当用作 LIBs 的阳极时，NiPS 纳米片在稳定的循环性能和倍率能力方面表现出优异的电化学性能。在 100 mA g 的电流密度下循环 150 次后，可提供稳定的可逆容量为 796.2 mA h g。对于 OER，剥离的少层 NiPS 纳米片表现出优异的电催化性能，例如在电流密度为 10 mA cm 时的低过电位为 301 mV，小的塔菲尔斜率为 43 mV dec，以及出色的长期耐久性。这项工作有望为开发下一代用于催化剂和电池的高性能电化学活性材料做出贡献。
