介孔材料
硅
材料科学
纳米技术
多孔硅
阳极
纳米颗粒
化学工程
锂(药物)
催化作用
化学
光电子学
电极
有机化学
物理化学
内分泌学
工程类
医学
作者
Xiuxia Zuo,Yonggao Xia,Qing Ji,Xiang Gao,Shanshan Yin,Meimei Wang,Xiaoyan Wang,Bao Qiu,Anxiang Wei,Zaicheng Sun,Jin Zhu,Ya‐Jun Cheng
出处
期刊:ACS Nano
[American Chemical Society]
日期:2016-12-28
卷期号:11 (1): 889-899
被引量:99
标识
DOI:10.1021/acsnano.6b07450
摘要
Porous silicon has found wide applications in many different fields including catalysis and lithium-ion batteries. Three-dimensional hierarchical macro-/mesoporous silicon is synthesized from zero-dimensional Stöber silica particles through a facile and scalable magnesiothermic reduction process. By systematic structure characterization of the macro-/mesoporous silicon, a self-templating mechanism governing the formation of the porous silicon is proposed. Applications as lithium-ion battery anode and photocatalytic hydrogen evolution catalyst are demonstrated. It is found that the macro-/mesoporous silicon shows significantly improved cyclic and rate performance over the commercial nanosized and micrometer-sized silicon particles. After 300 cycles at 0.2 A g-1, the reversible specific capacity is still retained as much as 959 mAh g-1 with a high mass loading density of 1.4 mg cm-2. With the large current density of 2 A g-1, a reversible capacity of 632 mAh g-1 is exhibited. The coexistence of both macro- and mesoporous structures is responsible for the enhanced performance. The macro-/mesoporous silicon also shows superior catalytic performance for photocatalytic hydrogen evolution compared to the silicon nanoparticles.
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