title: Fe/W Co-Doped BiVO4Photoanodes with a Metal-Organic Framework Cocatalyst for Improved Photoelectrochemical Stability and Activity.
abstract: BiVO4has been identified as one of the excellent visible light responsive photoanodes for use in photoelectrochemical (PEC) water splitting. However, pristine BiVO4usually exhibits relative low photocatalytic properties owing to insufficient charge separation and transport characteristics. Although the marginal n-type doping of higher valence ions can obviously raise the photocurrent value, it by no means improves the PEC stability. In this work, we successfully enhanced the PEC stability of BiVO4by doping Fe ions in substitution of Bi. Density functional theory calculations have illustrated that Fe-doping would result in an impurity band in the forbidden gap, and thus narrow its energy gap. More importantly, Fe-doping can synergize with other means to further improve the PEC activities of BiVO4. Therefore, we fabricated a nanoporous Fe/W co-doped BiVO4photoelectrode, and then loaded the metal-organic framework (MOF) MIL-100(Fe) as cocatalyst to further promote the separation of charge carriers. To the best of our knowledge, MOFs have not yet been utilized as a cocatalyst to facilitate the charge separation, which could increase the photocurrent density of Fe/W co-doped BiVO4.
authors: State Key Laboratory for Oxo Synthesis and Selective Oxidation, National Engineering Research Center for Fine Petrochemical Intermediates, Lanzhou Institute of Chemical Physics, CAS, Lanzhou, 730000, China. jiaozhb@licp.cas.cn.|Department of Physics, National University of Singapore, Singapore, 117542, Singapore. jiaozhb@licp.cas.cn.
authors: Zhengbo
authors: Z
authors: Jiao
authors: Department of Chemical Engineering, Binzhou University, Binzhou, 256603, China.
authors: Jingjing
authors: J
authors: Zheng
authors: State Key Laboratory for Oxo Synthesis and Selective Oxidation, National Engineering Research Center for Fine Petrochemical Intermediates, Lanzhou Institute of Chemical Physics, CAS, Lanzhou, 730000, China.
authors: Chenchen
authors: C
authors: Feng
authors: Department of Physics, National University of Singapore, Singapore, 117542, Singapore.
authors: Zeli
authors: Z
authors: Wang
authors: Department of Physics, National University of Singapore, Singapore, 117542, Singapore.
authors: Xuesen
authors: X
authors: Wang
authors: State Key Laboratory for Oxo Synthesis and Selective Oxidation, National Engineering Research Center for Fine Petrochemical Intermediates, Lanzhou Institute of Chemical Physics, CAS, Lanzhou, 730000, China.
authors: Gongxuan
authors: G
authors: Lu
authors: State Key Laboratory for Oxo Synthesis and Selective Oxidation, National Engineering Research Center for Fine Petrochemical Intermediates, Lanzhou Institute of Chemical Physics, CAS, Lanzhou, 730000, China. yingpubi@licp.cas.cn.
authors: Yingpu
authors: Y
authors: Bi
mesh_terms: D001729:Bismuth / Q000737:chemistry*; D002384:Catalysis; D055664:Electrochemical Techniques; D004566:Electrodes; D007501:Iron / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D055668:Photochemical Processes; D013056:Spectrophotometry, Ultraviolet; D014414:Tungsten / Q000737:chemistry*; D014638:Vanadates / Q000737:chemistry*
chemical_list: C091754:bismuth vanadium tetraoxide; D014638:Vanadates; D007501:Iron; D001729:Bismuth; D014414:Tungsten
keywords: charge separation; cocatalyst; iron; metal-organic framework; stability