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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
Department广州中国科学院沈阳自动化研究所分所
Source PublicationNanotechnology
ISSN0957-4484
2017
Volume28Issue:27Pages:1-9
Indexed BySCI ; EI
EI Accession number20172603811728
WOS IDWOS:000403587900001
Contribution Rank4
Funding OrganizationNSFC [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
KeywordWater Splitting Photoelectrochemical Cells Sinws/wo3 Core/shell Nanostructures
Abstract

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.

Language英语
WOS HeadingsScience & Technology ; Technology ; Physical Sciences
WOS SubjectNanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied
WOS KeywordHydrogen-production ; Visible-light ; Heterojunction Films ; Nanorod Arrays ; Efficient ; Nanoparticles ; Performance ; Oxide ; Si ; Nanostructures
WOS Research AreaScience & Technology - Other Topics ; Materials Science ; Physics
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sia.cn/handle/173321/20721
Collection广州中国科学院沈阳自动化研究所分所
Corresponding AuthorChen ZH(陈志鸿)
Affiliation1.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
Recommended Citation
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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