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Oxygen-Deficient Zirconia (ZrO2-x): A New Material for Solar Light Absorption

Title
Oxygen-Deficient Zirconia (ZrO2-x): A New Material for Solar Light Absorption
Authors
Sinhamahapatra, A[Sinhamahapatra, Apurba]Jeon, JP[Jeon, Jong-Pil]Kang, J[Kang, Joonhee]Han, B[Han, Byungchan]Yu, JS[Yu, Jong-Sung]
DGIST Authors
Sinhamahapatra, A[Sinhamahapatra, Apurba]; Jeon, JP[Jeon, Jong-Pil]; Kang, J[Kang, Joonhee]; Yu, JS[Yu, Jong-Sung]
Issue Date
2016-06-06
Citation
Scientific Reports, 6
Type
Article
Article Type
Article
ISSN
2045-2322
Abstract
Here, we present oxygen-deficient black ZrO2-x as a new material for sunlight absorption with a low band gap around ∼1.5 eV, via a controlled magnesiothermic reduction in 5% H2/Ar from white ZrO2, a wide bandgap(∼5 eV) semiconductor, usually not considered for solar light absorption. It shows for the first time a dramatic increase in solar light absorbance and significant activity for solar light-induced H2 production from methanol-water with excellent stability up to 30 days while white ZrO2 fails. Generation of large amounts of oxygen vacancies or surface defects clearly visualized by the HR-TEM and HR-SEM images is the main reason for the drastic alteration of the optical properties through the formation of new energy states near valence band and conduction band towards Fermi level in black ZrO2-x as indicated by XPS and DFT calculations of black ZrO2-x. Current reduction method using Mg and H2 is mild, but highly efficient to produce solar light-assisted photocatalytically active black ZrO2-x.
URI
http://hdl.handle.net/20.500.11750/2262
DOI
10.1038/srep27218
Publisher
Nature Publishing Group
Related Researcher
  • Author Yu, Jong Sung Light, Salts and Water Research Group
  • Research Interests Materials chemistry; nanomaterials; electrochemistry; carbon and porous materials; fuel cell; battery; supercapacitor; sensor and photochemical catalyst
Files:
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Collection:
ETC1. Journal Articles
Energy Science and EngineeringETC1. Journal Articles


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