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Inhibiting competing reactions of iodate/iodide redox mediators by surface modification of photocatalysts to enable Z-scheme overall water splitting
Qi, Yu1,2; Chen, Shanshan1; Cui, Junyan1,3; Wang, Zhiliang1; Zhang, Fuxiang1; Li, Can1
KeywordOverall Water Splitting Photocatalysis Z-scheme Surface Modification (Oxy)Nitride
Source PublicationAPPLIED CATALYSIS B-ENVIRONMENTAL
2018-05-01
ISSN0926-3373
DOI10.1016/j.apcatb.2017.10.041
Volume224Pages:579-585
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
WOS SubjectChemistry, Physical ; Engineering, Environmental ; Engineering, Chemical
WOS Research AreaChemistry ; Engineering
WOS KeywordVISIBLE-LIGHT-IRRADIATION ; 2-STEP PHOTOEXCITATION ; SYSTEM ; OXIDATION ; METAL ; WO3 ; NANOPARTICLES ; COCATALYSTS ; PERFORMANCE ; TAON
AbstractConstruction of photocatalytic Z-scheme overall water splitting (OWS) using iodate/iodide (IO3-/I-) redox mediator commonly confronts challenges of competing reactions and slow reaction kinetics. Here we address the aforementioned key issues using surface modification strategy. Visible-light-responsive tantalum nitride (Ta3N5) and tantalum oxynitride (TaON) are employed as the O2- and H-2-evolving photocatalysts, respectively. It is found that the inhibition of competing reactions and promotion of half reactions are indispensable for the successful construction of Z-scheme OWS system, both of which are directly related to the surface property of the photocatalysts. Specifically, the magnesia modification on the surface of Ta3N5 is demonstrated to be effective not only in suppressing the adsorption and oxidation of ions (a competing reaction of water oxidation), but also in promoting the charge separation and O-2-evolving rate via meliorative dispersion of loaded iridium co-catalyst. And surface coating of Cr2O3 nanolayer on the platinum cocatalyst loaded on the TaON-based photo catalyst is available to inhibit the reduction of IO3- ions (a competing reaction of proton reduction) and improve the H-2-evolving rate. Only after both inhibition of competing reactions and promotion of H-2- and O-2-evolving reactions under the assistance of surface modification, the visible-light-driven Z-scheme OWS system can be achieved successfully with the mixture of IO3- and I- ions as a redox mediator. This work sheds light on the availability and importance of surface modification strategy in fabricating Z-scheme OWS system.
Language英语
WOS IDWOS:000424960700061
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/168779
Collection中国科学院大连化学物理研究所
Corresponding AuthorZhang, Fuxiang; Li, Can
Affiliation1.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, State Key Lab Catalysis,iChEM, Dalian 116023, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Jilin Univ, Coll Chem, Key Lab Surface & Interface Chem Jilin Prov, Changchun 130021, Jilin, Peoples R China
Recommended Citation
GB/T 7714
Qi, Yu,Chen, Shanshan,Cui, Junyan,et al. Inhibiting competing reactions of iodate/iodide redox mediators by surface modification of photocatalysts to enable Z-scheme overall water splitting[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2018,224:579-585.
APA Qi, Yu,Chen, Shanshan,Cui, Junyan,Wang, Zhiliang,Zhang, Fuxiang,&Li, Can.(2018).Inhibiting competing reactions of iodate/iodide redox mediators by surface modification of photocatalysts to enable Z-scheme overall water splitting.APPLIED CATALYSIS B-ENVIRONMENTAL,224,579-585.
MLA Qi, Yu,et al."Inhibiting competing reactions of iodate/iodide redox mediators by surface modification of photocatalysts to enable Z-scheme overall water splitting".APPLIED CATALYSIS B-ENVIRONMENTAL 224(2018):579-585.
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