title: BiVO4 {010} and {110} Relative Exposure Extent: Governing Factor of Surface Charge Population and Photocatalytic Activity.
abstract: The {010} and {110} crystal facets of monoclinic bismuth vanadate (m-BiVO4) has been demonstrated to be the active reduction and oxidation sites, respectively. Here, we show using dual-faceted m-BiVO4 with distinctly different dominant exposed facets, one which is {010}-dominant and the other {110}-dominant, contrary to prediction, the former m-BiVO4 exhibits superior photooxidation activities. The population of photogenerated electrons and holes on the surface are revealed to be proportional to the respective surface areas of {010} and {110} exposed on m-BiVO4, as evidenced by steady-state photoluminescence (PL) measurements in the presence of charge scavengers. The better photoactivity of {010}-dominant m-BiVO4 is attributed to prompt electron transfer facilitated by the presence of more photogenerated electrons on the larger {010} surface. Additionally, the greater extent of electron trapping in {110}-dominant m-BiVO4 also deteriorates its photoactivity by inducing electron-hole pair recombination.
authors.affiliation: Particles and Catalysis Research Group, School of Chemical Engineering, and ‡Australian Centre for Advanced Photovoltaics, School of Photovoltaic and Renewable Energy Engineering, The University of New South Wales , Sydney, New South Wales 2052, Australia.
authors.forename: Hui Ling
authors.initials: HL
authors.lastname: Tan
authors.affiliation: Particles and Catalysis Research Group, School of Chemical Engineering, and ‡Australian Centre for Advanced Photovoltaics, School of Photovoltaic and Renewable Energy Engineering, The University of New South Wales , Sydney, New South Wales 2052, Australia.
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Wen
authors.affiliation: Particles and Catalysis Research Group, School of Chemical Engineering, and ‡Australian Centre for Advanced Photovoltaics, School of Photovoltaic and Renewable Energy Engineering, The University of New South Wales , Sydney, New South Wales 2052, Australia.
authors.forename: Rose
authors.initials: R
authors.lastname: Amal
authors.affiliation: Particles and Catalysis Research Group, School of Chemical Engineering, and ‡Australian Centre for Advanced Photovoltaics, School of Photovoltaic and Renewable Energy Engineering, The University of New South Wales , Sydney, New South Wales 2052, Australia.
authors.forename: Yun Hau
authors.initials: YH
authors.lastname: Ng