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Facile one-step deposition of ZnO-graphene nanosheets hybrid photoanodes for enhanced photoelectrochemical water splitting

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Abstract
ZnO-graphene nanosheets photoanodes were deposited at room temperature by a one-step kinetic spray process on a titanium sheet from micro-sized ZnO and graphite powders. ZnO-graphene nanosheet hybrid photoanodes with varying graphite contents were utilized for studying photoelectrochemical (PEC) water splitting. The Raman spectra revealed the direct transformation of micro-sized graphite powder to graphene nanosheets in all hybrid photoanodes after the deposition process, without any post-treatment. Surface morphology analysis revealed the fragmentation of the micro-sized flake morphology to morphology composed of mixed nanorods and nanosheets. The optical properties of the ZnO-graphene nanocomposites were investigated by the diffuse reflectance and photoluminescence (PL) emission spectroscopy, which revealed the decrease of the optical band gap and quenching of PL intensity. The hybrid photoanode with 50 wt% graphite content revealed the smallest bandgap of 2.6 eV and the lowest emission intensity compared with other hybrid photoanodes, which demonstrated the inhibition of photogenerated charge carrier recombination rate as well as an improvement in the visible-light-harvesting. The PEC results exhibited an improvement of the photocurrent with the incorporation of graphene nanosheets due to the improved photogenerated charge transfer kinetics and separation. The hybrid photoanode with 50 wt% graphite content revealed the highest photo-response current of 4.82 mA.cm(-2) corresponds to photoconversion efficiency of 3.25% @1.23 V vs. RHE. (c) 2021 Elsevier B.V. All rights reserved.
Author(s)
라슈완 아흐메드 갈랄 압델레힘천두만
Issued Date
2021
Type
Article
Keyword
ZnO-graphene hybrid photoanodesOne-step transformation of graphite to graphene nanosheetsNano-particle deposition system (NPDS)Photoelectrochemical water splittingImprovement of visible light harvesting
DOI
10.1016/j.jallcom.2021.159430
URI
https://oak.ulsan.ac.kr/handle/2021.oak/8875
https://ulsan-primo.hosted.exlibrisgroup.com/primo-explore/fulldisplay?docid=TN_cdi_gale_infotracacademiconefile_A658656858&context=PC&vid=ULSAN&lang=ko_KR&search_scope=default_scope&adaptor=primo_central_multiple_fe&tab=default_tab&query=any,contains,Facile%20one-step%20deposition%20of%20ZnO-graphene%20nanosheets%20hybrid%20photoanodes%20for%20enhanced%20photoelectrochemical%20water%20splitting&sortby=rank&pcAvailability=true
Publisher
JOURNAL OF ALLOYS AND COMPOUNDS
Location
스위스
Language
영어
ISSN
0925-8388
Citation Volume
870
Citation Number
1
Citation Start Page
159430
Citation End Page
159430
Appears in Collections:
Engineering > Mechanical and Automotive Engineering
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