{"title":"Bismuth Vacancies Induced Lattice Strain in BiVO4 Photoanodes Boosting Charge Separation For Water Oxidation","authors":"Boyan Liu, Xin Wang, Yingjuan Zhang, Kang Wan, Liangcheng Xu, Siqing Ma, Ruoting Zhao, Songcan Wang, Wei Huang","doi":"10.1002/aenm.202403835","DOIUrl":null,"url":null,"abstract":"Photoelectrochemical (PEC) water splitting is a promising technology for green hydrogen production. However, severe charge recombination in the photoelectrode materials is one of the key obstacles to achieving high performance. Herein, a BiVO₄ photoanode with lattice strain (Str-BVO) is constructed by generating Bi vacancies to promote charge separation in the bulk. The optimized Str-BVO photoanode achieves a photocurrent density of 6.20 mA cm⁻<sup>2</sup> at 1.23 V versus the reversible hydrogen electrode under AM 1.5 G illumination, with an impressive charge separation efficiency close to 100%. Systematical experiments and density functional theory reveal that the surface Bi vacancies induced strain causes the distortion of a small number of VO<sub>4</sub> tetrahedra, which increases the antibonding state energy of most normal VO<sub>4</sub> tetrahedra and creates more electronic vacancy states, thereby significantly promoting electron–hole separation. By surface loading with a FeNiO<sub>x</sub> co-catalyst, the photoanode exhibits excellent PEC water-splitting performance and stability.","PeriodicalId":111,"journal":{"name":"Advanced Energy Materials","volume":null,"pages":null},"PeriodicalIF":24.4000,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Advanced Energy Materials","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1002/aenm.202403835","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Photoelectrochemical (PEC) water splitting is a promising technology for green hydrogen production. However, severe charge recombination in the photoelectrode materials is one of the key obstacles to achieving high performance. Herein, a BiVO₄ photoanode with lattice strain (Str-BVO) is constructed by generating Bi vacancies to promote charge separation in the bulk. The optimized Str-BVO photoanode achieves a photocurrent density of 6.20 mA cm⁻2 at 1.23 V versus the reversible hydrogen electrode under AM 1.5 G illumination, with an impressive charge separation efficiency close to 100%. Systematical experiments and density functional theory reveal that the surface Bi vacancies induced strain causes the distortion of a small number of VO4 tetrahedra, which increases the antibonding state energy of most normal VO4 tetrahedra and creates more electronic vacancy states, thereby significantly promoting electron–hole separation. By surface loading with a FeNiOx co-catalyst, the photoanode exhibits excellent PEC water-splitting performance and stability.
光电化学(PEC)水分离技术是一种前景广阔的绿色制氢技术。然而,光电极材料中严重的电荷重组是实现高性能的关键障碍之一。在此,我们通过产生铋空位来促进块体中的电荷分离,从而构建了具有晶格应变的BiVO₄光阳极(Str-BVO)。优化后的 Str-BVO 光阳极在 AM 1.5 G 光照下,相对于可逆氢电极,在 1.23 V 电压下的光电流密度达到 6.20 mA cm-2,电荷分离效率接近 100%,令人印象深刻。系统实验和密度泛函理论表明,表面 Bi 空位诱导的应变会导致少量 VO4 四面体变形,从而增加大多数正常 VO4 四面体的反键态能量,产生更多的电子空位态,从而显著促进电子-空穴分离。通过表面负载 FeNiOx 助催化剂,光阳极表现出卓越的 PEC 分水性能和稳定性。
期刊介绍:
Established in 2011, Advanced Energy Materials is an international, interdisciplinary, English-language journal that focuses on materials used in energy harvesting, conversion, and storage. It is regarded as a top-quality journal alongside Advanced Materials, Advanced Functional Materials, and Small.
With a 2022 Impact Factor of 27.8, Advanced Energy Materials is considered a prime source for the best energy-related research. The journal covers a wide range of topics in energy-related research, including organic and inorganic photovoltaics, batteries and supercapacitors, fuel cells, hydrogen generation and storage, thermoelectrics, water splitting and photocatalysis, solar fuels and thermosolar power, magnetocalorics, and piezoelectronics.
The readership of Advanced Energy Materials includes materials scientists, chemists, physicists, and engineers in both academia and industry. The journal is indexed in various databases and collections, such as Advanced Technologies & Aerospace Database, FIZ Karlsruhe, INSPEC (IET), Science Citation Index Expanded, Technology Collection, and Web of Science, among others.