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Visualizing the Nano Cocatalyst Aligned Electric Fields on Single Photocatalyst Particles
Zhu, Jian1; Pang, Shan1; Dittrich, Thomas3; Gao, Yuying1,2; Nie, Wei1,2; Cui, Junyan1,2; Chen, Ruotian1,2; An, Hongyu1,2; Fan, Fengtao1; Li, Can1
KeywordPhotocatalysis Charge Separation Nano Cocatalyst Size-dependent Effect Surface Imaging Built-in Electric Fields
Source PublicationNANO LETTERS
2017-11-01
ISSN1530-6984
DOI10.1021/acs.nanolett.7b02799
Volume17Issue:11Pages:6735-6741
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
WOS SubjectChemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter
WOS Research AreaChemistry ; Science & Technology - Other Topics ; Materials Science ; Physics
WOS KeywordHIGH QUANTUM EFFICIENCY ; WATER OXIDATION ; BIVO4 PHOTOCATALYST ; HYDROGEN-PRODUCTION ; CHARGE SEPARATION ; DIFFERENT FACETS ; PT-PDS/CDS ; EVOLUTION ; PHOTOANODES ; SURFACE
AbstractThe cocatalysts or dual cocatalysts of photocatalysts are indispensable for high efficiency in artificial photosynthesis for solar fuel production. However, the reaction activity increased by cocatalysts cannot be directly ascribed to the accelerated catalytic kinetics, since photogenerated charges are involved in the elementary steps of photocatalytic reactions. To date, diverging views about cocatalysts show that their exact role for photocatalysis is not well understood yet. Herein, we image directly the local separation of photogenerated charge carriers across single crystals of the BiVO4 photocatalyst which loaded locally with nanoparticles of a MnOx single cocatalyst or with nanoparticles of a spatially separated MnOx and Pt dual cocatalyst. The deposition of the single cocatalyst resulted not only in a strong increase of the interfacial charge transfer but also, surprisingly, in a change of the direction of built-in electric fields beneath the uncovered surface of the photocatalyst. The additive electric fields caused a strong increase of local surface photovoltage signals (up to 80 times) and correlated with the increase of the photocatalytic performance. The local electric fields were further increased (up to 2.5 kV.cm(-1)) by a synergetic effect of the spatially separated dual cocatalysts. The results reveal that cocatalyst has a conclusive effect on charge separation in photocatalyst particle by aligning the vectors of built-in electric fields in the photocatalyst particle. This effect is beyond its catalytic function in thermal catalysis.
Language英语
WOS IDWOS:000415029000035
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:30[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/168441
Collection中国科学院大连化学物理研究所
Corresponding AuthorFan, Fengtao; Li, Can
Affiliation1.Chinese Acad Sci, Dalian Inst Chem Phys, Collaborat Innovat Ctr Chem Energy Mat iChEM, State Key Lab Catalysis,Dalian Natl Lab Clean Ener, Zhongshan Rd 457, Dalian 116023, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Helmholtz Zentrum Berlin Mat & Energie GmbH, Inst Silizium Photovolta, Kekulestr 5, D-12489 Berlin, Germany
Recommended Citation
GB/T 7714
Zhu, Jian,Pang, Shan,Dittrich, Thomas,et al. Visualizing the Nano Cocatalyst Aligned Electric Fields on Single Photocatalyst Particles[J]. NANO LETTERS,2017,17(11):6735-6741.
APA Zhu, Jian.,Pang, Shan.,Dittrich, Thomas.,Gao, Yuying.,Nie, Wei.,...&Li, Can.(2017).Visualizing the Nano Cocatalyst Aligned Electric Fields on Single Photocatalyst Particles.NANO LETTERS,17(11),6735-6741.
MLA Zhu, Jian,et al."Visualizing the Nano Cocatalyst Aligned Electric Fields on Single Photocatalyst Particles".NANO LETTERS 17.11(2017):6735-6741.
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