2022-Sustainable Industrial Processing Summit
SIPS2022 Volume 18 Intl. Symp on Advanced Materials, Polymers, Composite, Nanomaterials, Nanotechnologies and Manufacturing
| Editors: | F. Kongoli, F. Marquis, N. Chikhradze, T. Prikhna, M. De Campos, S. Lewis, S. Miller, S. Thomas. |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2022 |
| Pages: | 290 pages |
| ISBN: | 978-1-989820-68-1(CD) |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Enhancement of Photoelectrochemical Properties of BiVO4 Layer Coated ZnO Nanodendrite Core–Shell Nanocomposites: Electronic Mechanism from Synchrotron based X–ray Spectro-Microscopic Studies
Hsiao-Tsu Wang1; Hung-Wei Shiu2; Jau-Wern Chiou3; Takuji Ohigashi4; Kandasami Asokan5; Nobuhiro Kosugi4; way-Faung Pong1;1DEPARTMENT OF PHYSICS, TAMKANG UNIVERSITY, TAIWAN, New Taipei City, Taiwan; 2NATIONAL SYNCHROTRON RADIATION RESEARCH CENTER, Hsinchu, Taiwan; 3DEPARTMENT OF APPLIED PHYSICS, NATIONAL UNIVERSITY OF KAOHSIUNG, Kaohsiung, Taiwan; 4INSTITUTE FOR MOLECULAR SCIENCE, Okazaki, Japan; 5INTER UNIVERSITY ACCELERATOR CENTRE, New Delhi, India;
Type of Paper: Regular
Id Paper: 54
Topic: 16
Abstract:
Synchrotron-based X-ray Spectro- and microscopic techniques are used in the present study to understand the origin of enhancement of photoelectrochemical (PEC) properties with nanocomposite BiVO4 (BVO) coated on ZnO nanodendrites, named as BVO/ZnO. This high PEC nanodendrites core-shell BVO/ZnO heterojunction is successfully grown and well-characterized for morphological and structural details [1]. Although the band alignment at BVO/ZnO heterojunction is likely to type I, the charge transport behavior is belonging in type II with the strong charge transfer (CT) with forming the high PEC heterojunction [2]. The strongly CT behavior from the V 3d (at shell-BVO) to Zn 4s/p (core-ZnO) in core-shell BVO/ZnO with the high number of O 2p unpair derived states at the interface is caused by the increasing the oxygen defects at the interface to construct interfacial band gap at 2.6 eV in core-shell BVO/ZnO. The interfacial band gap enhances the PEC performance with an increase in the efficiency of visible light-absorption and electron-hole separation. In addition, the distortion in the interface of core-shell BVO/ZnO with the high interfacial oxygen defects affects the O 2p -V 3d hybridization by decreasing the crystal field energy 10Dq ~2.2 eV, resulting the high electron-hole separation at the interface to improve PEC performance [3]. This study provides the evidence that the high PEC properties in nano-structure core-shell BVO/ZnO heterostructures are developed by the strongly CT, high electron-hole separation, and large visible light-absorption at the interface due to the increase in interfacial oxygen defects in the core-shell interface.
These insights from the local electronic and atomic structures in BVO layer coated ZnO nanodentrites may guide the fabrication of semiconductor heterojunctions with optimal compositions and interface that are highly desired to maximize the solar light utilization for PEC water splitting and their applications.
Keywords:
Core-Shell; Energy; Nanomaterials; Spectroscopy;References:
[1] Yang, J. S.; Wu, J. J., Low-potential driven fully-depleted BiVO4/ZnO heterojunction nanodendrite array photoanodes for photoelectrochemical water splitting. Nano Energy 2017, 32, 232-240.
[2] Moniz, S. J. A.; Shevlin, S. A.; Martin, D. J.; Guo, Z.-X.; Tang, J., Visible-light driven heterojunction photocatalysts for water splitting – a critical review. Energy Environ. Sci. 2015, 8, 731-759.
[3] Chen, Z.; Fan, T.; Shao, M.; Yu, X.; Wu, Q.; Li, J.; Fang, W.; Yi, X., Simultaneously enhanced photon absorption and charge transport on a distorted graphitic carbon nitride toward visible light photocatalytic activity. Appl. Catal. B 2019, 242, 40-50.