纳米孔
阳极
材料科学
电化学
化学工程
电极
合金
离子
纳米技术
化学
物理化学
复合材料
有机化学
工程类
作者
Zhijia Zhang,Shihao Sun,Yuefang Chen,Yanhao Wei,Mengmeng Zhang,Chunsheng Li,Yu Sun,Shaofei Zhang,Yong Jiang
标识
DOI:10.1016/j.cclet.2023.108922
摘要
Three-dimentional (3D) transition metal selenides with sufficient channels could produce significant superiority on enhancing reaction kinetics for sodium-ion batteries. However, the thorough exploration of 3D architecture with a facile strategy is still challenging. Here we report that a polycrystalline Cu2-xSe film was epitaxial grown on (220) facets-exposed Cu by direct selenization of a nanoporous Cu skeleton, which is obtained by dealloying rolled CuMn@Cu alloy foil. Density Functional Theory calculation result shows strong adsorption energy for Se atoms on Cu (220) planes during selenization reaction, rendering a low energy consumption. By virtue of this core-shell 3D nanoporous architecture to offer abundant active sites and endow fast electron/ion transportation, the nanoporous Cu2-x[email protected] composite electrode exhibits remarkable sodium-ion storage properties with high reversible capacity of 950.6 μAh/cm2 at 50 μA/cm2, suprior rate capability of 457.6 μAh/cm2 at 500 μA/cm2, as well as an ultra-long stability at a high current density. Mechanism investigation reveals that the electrochemical reaction is a typical conversion-type reaction with different intermediates. This novel electrode synthetic strategy provides useful instructions to design the high-performance anode material for sodium-ion batteries.
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