title: Photoelectrochemical water oxidation efficiency of a core/shell array photoanode enhanced by a dual suppression strategy.
abstract: The development of earth-abundant semiconductor photoelectrodes is of great importance to high-efficiency and sustainable photoelectrochemical water splitting. Herein, a one-dimensional TiO2 array photoanode was sheathed with an ultrathin overlayer of phosphated nickel-chromium double-metal hydroxide by a photoassisted modification and deposition strategy. The core/shell array photoanode resulted in a large cathodic shift of photocurrent onset potential (≈200 mV). Nearly 100 % oxidative efficiency for PEC water oxidation was achieved over a wide range of potential. Mechanism studies show that the modification of phosphate leads to significantly improved charge separation. The amorphous hydroxide sheath could efficiently inhibit oxygen reduction reactions. Therefore, this strategy enables the simultaneous suppression of surface carrier recombination and back reactions, which is promising to improve the water oxidation efficiency of currently prevailing photoanodes.
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029 (P.R. China).
authors.forename: Wanhong
authors.initials: W
authors.lastname: He
authors.affiliation: Chemical and Materials Science Center, National Renewable Energy Laboratory, Golden, CO 80401 (USA).
authors.forename: Ye
authors.initials: Y
authors.lastname: Yang
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029 (P.R. China).
authors.forename: Liren
authors.initials: L
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029 (P.R. China).
authors.forename: Junjiao
authors.initials: J
authors.lastname: Yang
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029 (P.R. China). xiangxu@mail.buct.edu.cn.
authors.forename: Xu
authors.initials: X
authors.lastname: Xiang
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029 (P.R. China). yandongpeng001@163.com.|Key Laboratory of Theoretical and Computational, Photochemistry Ministry of Education, College of Chemistry, Beijing Normal University, Beijing 100875 (P.R. China). yandongpeng001@163.com.
authors.forename: Dongpeng
authors.initials: D
authors.lastname: Yan
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029 (P.R. China).
authors.forename: Feng
authors.initials: F
authors.lastname: Li
mesh_terms: D002021:Buffers; D002384:Catalysis; D002857:Chromium / Q000737:chemistry; D004563:Electrochemistry; D004566:Electrodes; D006878:Hydroxides / Q000737:chemistry; D009532:Nickel / Q000737:chemistry; D010084:Oxidation-Reduction; D055668:Photochemical Processes; D014867:Water / Q000737:chemistry*
chemical_list: D002021:Buffers; D006878:Hydroxides; D014867:Water; D002857:Chromium; D009532:Nickel
keywords: electrochemistry; nanostructures; oxidation; photochemistry; sustainable chemistry