Self-motivated,thermally oxidized hematite nanoflake photoanodes:Effects of pre-polishing and ZrO_(2) passivation layer

作     者：Love Kumar Dhandole Hyun Hwi Lee Weon-Sik Chae Jum Suk Jang Jae Sung Lee Love Kumar Dhandole;Hyun Hwi Lee;Weon-Sik Chae;Jum Suk Jang;Jae Sung Lee

作者机构：Department of Energy EngineeringSchool of Energy and Chemical EngineeringUlsan National Institute of Science and Technology(UNIST)Ulsan 44919Republic of Korea Division of BiotechnologyCollege of Environmental and Bioresource SciencesChonbuk National UniversityIksan 54596Republic of Korea Pohang Accelerator LaboratoryPohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Daegu CenterKorea Basic Science InstituteDaegu 41566Republic of Korea 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2022年第31卷第2期

页      面：415-423页

核心收录：

学科分类：081702[工学-化学工艺] 07[理学] 070205[理学-凝聚态物理] 08[工学] 0817[工学-化学工程与技术] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：supported by the Climate Change Response Project(NRF-2019M1A2A2065612) the Basic Science Grant(NRF2019R1A4A1029237) Korea-China Key Joint Research Program(2017K2A9A2A11070341)funded by the Ministry of Science and ICT the 2019 Research Fund(1.190013.01)of UNIST support by the Basic Science Research Programs through the National Public Technology Program based on Environmental Policy(2014000160001) the SRC program through the National Research Foundation of Korea(NRF2015R1A5A1009962) 

主　　题：Fe foil Thermal oxidation Nanoflakes Photoelectrochemical water splitting Surface modifications 

摘      要：High-temperature thermal oxidation of an Fe foil produces a high-quality,crystalline hematite nanoflake suitable as a photoanode for the photoelectrochemical(PEC)water *** pre-polishing of the foil surface has a profound effect in the formation of a vertically-aligned nanoflakes of hematite phase with extended(110)planes by removing the loosely-bonded oxide *** the surface of the photoanode is modified with a ZrO_(2) passivation layer and a cobalt phosphate co-catalyst,the charge recombination at the photoanode-electrolyte interface is greatly suppressed to improve its overall PEC *** a result,the photocurrent density at 1.10 VRHE under 1 sun condition is enhanced from 0.22 mA cm^(-2) for an unmodified photoanode to 0.59 mA cm^(-2) for the fully modified photoanode,and the photocurrent onset potential is shifted cathodically by 400 ***,the photoanode demonstrates outstanding stability by showing steady production of H_(2) and O_(2) gases in the stoichiometric ratio of 2:1 in a continuous PEC operation for 10 h.