Unusual effects of vacuum annealing on large-area Ag_(3)PO_(4) microcrystalline film photoanode boosting cocatalyst-and scavengerfree water splitting
作者机构：Key Laboratory of Energy Thermal Conversion and Control of Ministry of EducationSchool of Energy and EnvironmentSoutheast UniversityNanjing210096China Department of Mechanical EngineeringSchool of EngineeringThe University of TokyoTokyo113-8656Japan Laboratory of Advanced MaterialsDepartment of Materials ScienceAnd Collaborative Innovation Center of Chemistry for Energy Materials(iChEM)Fudan UniversityShanghai200438China Guangdong Provincial Key Laboratory of Nano-Micro Materials ResearchSchool of Chemical Biology and BiotechnologyPeking University Shenzhen Graduate SchoolShenzhen518055China Department of ChemistrySchool of ScienceThe University of TokyoTokyo113-8656Japan
出 版 物：《Journal of Materiomics》 (无机材料学学报（英文）)
年 卷 期：2021年第7卷第5期
页 面：929-939页
核心收录：
学科分类：081702[工学-化学工艺] 081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）]
基 金：This work was supported by Fundamental Research Funds for the Central Universities of Ministry of Education of China(Southeast University) Core-to-Core Program(Advanced Research Networks Type A)of Japan Society for the Promotion of Science(JSPS) Q.Cao acknowledges the support of China Scholarship Council(No.201506100018) the START project of Japan Science and Technology Agency(JST) R.Che thanks the support of National Basic Research Program(973 Program No.2018YFA0209102) National Science Fund for Distinguished Young Scholars(No.51725101) National Natural Science Foundation of China(Nos.11727807,51672050,and 61790581)of China
主 题：Orthophosphate Defect engineering Light harvesting Oxygen evolution reaction(OER) Hydrogen production Post-annealing
摘 要：Ag_(3)PO_(4) as a novel photoanode material,despite its arguably highest photoactivity,suffers for its poor light absorption and stability for photoelectrochemical(PEC)water *** this work,4.54.5 cm^(2) Ag_(3)PO_(4) microcrystalline films are grown via a room-temperature solution process,and vacuum annealing is proposed to solve the stability and light absorption *** is found that the major process below 400℃ of vacuum annealing is the|Recovery|process for Ag_(3)PO_(4) microcrystals,when lattice defects and Ag0 surface species get ***,|Recrystallization|stage occurs at40℃.The recovery of native defects of silver vacancies,with both density functional theory calculation and experimental results,could simultaneously improve the light absorption and catalytic activity of Ag_(3)PO_(4).The 400℃-annealed Ag_(3)PO_(4) photoanode,with enhanced light harvesting and crystal quality,exhibits 88% increase in(Jlight-Jdark)value(1.94 mA cm^(-2))than non-annealed photoanode(1.03 mA cm^(-2)).Moreover,it retains99% current density after a 4000-s stability *** results suggest that vacuum annealing can substantially improve the PEC performance of Ag_(3)PO_(4) microcrystalline film photoanodes due to mitigated effects of native defects,improved light harvesting,and inhibited Ag_(3)PO_(4) decomposition during water oxidation reaction.
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