title: Visible-Near-Infrared-Light-Driven Oxygen Evolution Reaction with Noble-Metal-Free WO2-WO3Hybrid Nanorods.
abstract: Understanding and manipulating the one half-reaction of photoinduced hole-oxidation to oxygen are of fundamental importance to design and develop an efficient water-splitting process. To date, extensive studies on oxygen evolution from water splitting have focused on visible-light harvesting. However, capturing low-energy photons for oxygen evolution, such as near-infrared (NIR) light, is challenging and not well-understood. This report presents new insights into photocatalytic water oxidation using visible and NIR light. WO2-WO3hybrid nanorods were in situ fabricated using a wet-chemistry route. The presence of metallic WO2strengthens light absorption and promotes the charge-carrier separation of WO3. The efficiency of the oxygen evolution reaction over noble-metal-free WO2-WO3hybrids was found to be significantly promoted. More importantly, NIR light (≥700 nm) can be effectively trapped to cause the photocatalytic water oxidation reaction. The oxygen evolution rates are even up to around 220 (λ = 700 nm) and 200 (λ = 800 nm) mmol g-1h-1. These results demonstrate that the WO2-WO3material is highly active for water oxidation with low-energy photons and opens new opportunities for multichannel solar energy conversion.
authors.affiliation: Department of Chemistry, National University of Singapore , 3 Science Drive 3, 117543, Singapore.|Singapore-Peking University Research Centre for a Sustainable Low-Carbon Future , 1 Create Way, #15-01, CREATE Tower, 138602, Singapore.
authors.forename: Song Ling
authors.initials: SL
authors.lastname: Wang
authors.affiliation: Department of Chemistry, National University of Singapore , 3 Science Drive 3, 117543, Singapore.
authors.forename: Yan Lin
authors.initials: YL
authors.lastname: Mak
authors.affiliation: Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research) , 3 Research Link, 117602, Singapore.
authors.forename: Shijie
authors.initials: S
authors.lastname: Wang
authors.affiliation: Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research) , 3 Research Link, 117602, Singapore.
authors.forename: Jianwei
authors.initials: J
authors.lastname: Chai
authors.affiliation: Singapore-Peking University Research Centre for a Sustainable Low-Carbon Future , 1 Create Way, #15-01, CREATE Tower, 138602, Singapore.|BNLMS, SKLSCUSS, College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, P. R. China.
authors.forename: Feng
authors.initials: F
authors.lastname: Pan
authors.affiliation: Department of Chemistry, National University of Singapore , 3 Science Drive 3, 117543, Singapore.
authors.forename: Maw Lin
authors.initials: ML
authors.lastname: Foo
authors.affiliation: Department of Chemistry, National University of Singapore , 3 Science Drive 3, 117543, Singapore.|Singapore-Peking University Research Centre for a Sustainable Low-Carbon Future , 1 Create Way, #15-01, CREATE Tower, 138602, Singapore.
authors.forename: Wei
authors.initials: W
authors.lastname: Chen
authors.affiliation: Singapore-Peking University Research Centre for a Sustainable Low-Carbon Future , 1 Create Way, #15-01, CREATE Tower, 138602, Singapore.|BNLMS, SKLSCUSS, College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, P. R. China.
authors.forename: Kai
authors.initials: K
authors.lastname: Wu
authors.affiliation: Department of Chemistry, National University of Singapore , 3 Science Drive 3, 117543, Singapore.|Singapore-Peking University Research Centre for a Sustainable Low-Carbon Future , 1 Create Way, #15-01, CREATE Tower, 138602, Singapore.
authors.forename: Guo Qin
authors.initials: GQ
authors.lastname: Xu