期刊
NANOSCALE
卷 12, 期 1, 页码 316-325出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nr06635g
关键词
-
类别
资金
- National Natural Science Foundation of China [51472229, 61422405, 11574301]
- National Natural Science Foundation of Tianjin [14JCQNJC01000]
- National Science Foundation for Post-doctoral Scientists of China [2016M600231]
Micro-/nanostructured silicon (Si) photoelectrodes are promising for efficient solar-driven water splitting. In this work, an elaborate study on textured Si photocathodes is reported. Compared to conventional textured Si photocathodes, the well-designed Si photocathode with randomly-distributed inverted pyramid arrays (SiIPs) generates a larger photovoltage of 440 mV for its higher effective minority carrier density, and produces a higher photocurrent density at a high reverse bias voltage due to its quasi-hydrophilicity. With the help of cobalt disulfide (CoS2) nanocrystals, sluggish charge kinetics of SiIP photocathodes can be further improved. The optimal SiIP/CoS2 photocathode yields an onset potential of 0.22 V vs. reversible hydrogen electrode (RHE) and a saturated photocurrent density of 10.4 mA cm(-2) at -0.45 V (vs. RHE). Besides, this cathode produces a stable photocurrent density of similar to 6.60 mA cm(-2) at 0 V (vs. RHE) for 12 000 s in acidic media. Notably, our work presents a facile and inexpensive method to fabricate efficient Si photoelectrodes, which may promote the evolution of textured Si-based electrodes for potential photoelectrochemical and photocatalytic applications.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据