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题名:
Effective silicon nanowire arrays/WO3core/shell photoelectrode for neutral pH water splitting
作者: Chen, Zhen; Ning, Minghui; Ma, Ge; Meng QG(孟庆国); Zhang, Yongguang; 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
通讯作者: 陈志鸿
关键词: water splitting ; photoelectrochemical cells ; SiNWs/WO3 core/shell nanostructures
刊名: Nanotechnology
ISSN号: 0957-4484
出版日期: 2017
卷号: 28, 期号:27, 页码:1-9
收录类别: SCI ; EI
产权排序: 4
项目资助者: 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
EI收录号: 20172603811728
WOS记录号: WOS:000403587900001
WOS标题词: Science & Technology ; Technology ; Physical Sciences
类目[WOS]: 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
研究领域[WOS]: Science & Technology - Other Topics ; Materials Science ; Physics
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内容类型: 期刊论文
URI标识: http://ir.sia.cn/handle/173321/20721
Appears in Collections:广州中国科学院沈阳自动化研究所分所_期刊论文

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Recommended Citation:
Chen, Zhen,Ning, Minghui,Ma, Ge,et al. Effective silicon nanowire arrays/WO3core/shell photoelectrode for neutral pH water splitting[J]. Nanotechnology,2017,28(27):1-9.
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