Effective silicon nanowire arrays/WO3 core/shell photoelectrode for neutral pH water splitting
Chen, Zhen; Ning, Minghui; Ma, Ge; Meng QG(孟庆国); Zhang YG(张永光); Gao, Jinwei; Jin, Mingliang; Chen ZH(陈志鸿); Yuan MZ(苑明哲); Wang, Xin; Liu, Jun-Ming; Zhou, Guofu
作者部门广州中国科学院沈阳自动化研究所分所
关键词Water Splitting Photoelectrochemical Cells Sinws/wo3 Core/shell Nanostructures
发表期刊Nanotechnology
ISSN0957-4484
2017
卷号28期号:27页码:1-9
收录类别SCI ; EI
EI收录号20172603811728
WOS记录号WOS:000403587900001
产权排序4
资助机构NSFC [51602111] ; National Key R & D Program of China [2016YFB0401502] ; Guangdong Provincial Grant [2015A030310196, 2014B090915005] ; Pearl River S&T Nova Program of Guangzhou [201506040045] ; Hundred Talent Program of Chinese Academy Sciences (QG Meng) ; Guangzhou Post-doctoral Initial Funding ; National 111 Project
摘要

We report the first demonstration of a high-efficiency photoelectrochemical (PEC) water splitting reaction using a novel Si NWs/WO3core/shell photoanode prepared by a mild and inexpensive metal-catalyzed electroless etching process followed by dip-coating, airing and annealing methods. The dense and vertically aligned Si NWs/WO3core/shell nanostructure were characterized by scanning electron microscopy, transmission electron microscopy and x-ray diffraction. In comparison to planar n-Si, Si NWs and planar Si/WO3, the Si NWs/WO3samples showed significantly enhanced photocurrent over the entire potential sweep range. More significantly, the Si NWs/WO3samples have an exceptionally low photocurrent onset potential of -0.6393 V versus reversible hydrogen electrode (RHE), indicating very efficient charge separation and charge transportation processes. The as-prepared electrode also has a photocurrent density of 2.7 mA cm-2at 0.6107 V versus RHE in 0.5 M Na2SO4solution under simulated solar light irradiation (100 mW cm-2from 300 W Xenon lamp coupled with an AM 1.5 G filter). An optimal solar-to-hydrogen efficiency of about 1.9% was achieved at 0.2676 V versus RHE. Electrochemical impedance spectroscopy was conducted to investigate the properties of the charge transfer process, and the results indicated that the enhanced PEC performance may due to the increased charge separation. The x-ray photoelectron spectroscopy measurements indicated the chemical composition of the Si NWs/WO3nanostructure. Our work has provided an efficient strategy to improve the energy conversion efficiency and photocurrent of water splitting materials.

语种英语
WOS标题词Science & Technology ; Technology ; Physical Sciences
WOS类目Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied
关键词[WOS]Hydrogen-production ; Visible-light ; Heterojunction Films ; Nanorod Arrays ; Efficient ; Nanoparticles ; Performance ; Oxide ; Si ; Nanostructures
WOS研究方向Science & Technology - Other Topics ; Materials Science ; Physics
引用统计
被引频次:1[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.sia.cn/handle/173321/20721
专题广州中国科学院沈阳自动化研究所分所
通讯作者Chen ZH(陈志鸿)
作者单位1.Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangdong Province, Guangzhou, China
2.Institute of Advanced Materials, South China Academy of Advanced Optoelectronics, South China Normal University, Guangdong Province, Guangzhou, China
3.International Academy of Optoelectronics at Zhaoqing, South China Normal University, Guangdong Province, China
4.Shenyang Institute of Automation, Chinese Academy of Sciences, Guangzhou, Guangzhou, 511458, China
5.Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210093, China
推荐引用方式
GB/T 7714
Chen, Zhen,Ning, Minghui,Ma, Ge,et al. Effective silicon nanowire arrays/WO3 core/shell photoelectrode for neutral pH water splitting[J]. Nanotechnology,2017,28(27):1-9.
APA Chen, Zhen.,Ning, Minghui.,Ma, Ge.,Meng QG.,Zhang YG.,...&Zhou, Guofu.(2017).Effective silicon nanowire arrays/WO3 core/shell photoelectrode for neutral pH water splitting.Nanotechnology,28(27),1-9.
MLA Chen, Zhen,et al."Effective silicon nanowire arrays/WO3 core/shell photoelectrode for neutral pH water splitting".Nanotechnology 28.27(2017):1-9.
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