title: Unidirectional suppression of hydrogen oxidation on oxidized platinum clusters.
abstract: Solar-driven water splitting to produce hydrogen may be an ideal solution for global energy and environment issues. Among the various photocatalytic systems, platinum has been widely used to co-catalyse the reduction of protons in water for hydrogen evolution. However, the undesirable hydrogen oxidation reaction can also be readily catalysed by metallic platinum, which limits the solar energy conversion efficiency in artificial photosynthesis. Here we report that the unidirectional suppression of hydrogen oxidation in photocatalytic water splitting can be fulfilled by controlling the valence state of platinum; this platinum-based cocatalyst in a higher oxidation state can act as an efficient hydrogen evolution site while suppressing the undesirable hydrogen back-oxidation. The findings in this work may pave the way for developing other high-efficientcy platinum-based catalysts for photocatalysis, photoelectrochemistry, fuel cells and water-gas shift reactions.
authors.affiliation: 1] Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China [2].
authors.forename: Yu Hang
authors.initials: YH
authors.lastname: Li
authors.forename: Jun
authors.initials: J
authors.lastname: Xing
authors.forename: Zong Jia
authors.initials: ZJ
authors.lastname: Chen
authors.forename: Zhen
authors.initials: Z
authors.lastname: Li
authors.forename: Feng
authors.initials: F
authors.lastname: Tian
authors.forename: Li Rong
authors.initials: LR
authors.lastname: Zheng
authors.forename: Hai Feng
authors.initials: HF
authors.lastname: Wang
authors.forename: P
authors.initials: P
authors.lastname: Hu
authors.forename: Hui Jun
authors.initials: HJ
authors.lastname: Zhao
authors.forename: Hua Gui
authors.initials: HG
authors.lastname: Yang