Enhanced photocatalytic activities of the heterostructured upconversion photocatalysts with cotton mediated on TiO 2 /ZnWO 4 :Yb 3+ ,Tm 3+

Ling Mei, Jia Hu, Xudong Cao, Fangfang Wang, Chao Zheng, Youtian Tao, Xinwen Zhang, Wei Huang, Taewon Kim, Junseong Lee, Sang Hoon Uck Lee, Min Hyung Lee, Daniele Masseroni, Elisa Biavardi, Damiano Genovese, Enrico Rampazzo, Luca Prodi, Enrico Dalcanale, Picoquant Fluofit, Sophia BuhbutJohn N Clifford, Monica Kosa, Asaf Y Anderson, Menny Shalom, Dan Thomas Major, Emilio Palomares, Arie Zaban, Bin-Bin Cui, Jian-Hong Tang, Jiannian Yao, Yu-Wu Zhong, Ronen Gottesman, Shay Tirosh, Hannah-Noa Barad, Arie Zaban, Darius G. Rackus, Mohtashim H. Shamsi, Aaron R. Wheeler, Kaili Feng, Shouqiang Huang, Ziyang Lou, Nanwen Zhu, Haiping Yuan, Taewon Kim, Junseong Lee, Sang Hoon Uck Lee, Min Hyung Lee, Ji-Hyeon Park, Sang Hoon Uck Lee, Tae Il Lee, Jae-Min Myoung, J Kusters

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

Abstract

In photoelectrochemical cells, one major recombination pathway involves a reaction between the photogenerated electrons that diffuse inside the semiconductor electrode and holes, in the form of oxidized ions, which travel in the electrolyte to the counter electrode. Here we present direct imaging of the recombination/reduction sites in two types of porous TiO2 electrodes, P25 and submicrometer particles, chosen for studying the influence of the TiO2 particles’ sizes and shapes on the recombination sites. The sites were labeled with 2−5 nm silver particles, electrodeposited on the TiO2 surface using chronoamperometry. The model assumes that reduction and recombination are similar with respect to the electron transfer from the TiO2 surface to an ionic electron acceptor in the electrolyte redox mediator/Ag+ ion. Consequently the metal deposit marks the reaction locations. This first high-resolution view clearly identifies the connecting points between TiO2 particles and then the {101} facets as the sites of recombination.
Original languageAmerican English
Title of host publicationChem. Commun.
PublisherRoyal Society of Chemistry
Pages3455-3458
Number of pages4
ISBN (Print)1215421109
StatePublished - 2015

Publication series

NameChem. Commun.
Volume51

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