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Electrosprayed BiVO4 nanopillars coated with atomic-layer-deposited ZnO/TiO2 as highly efficient photoanodes for solar water splitting
- Authors
- Kim, Min-Woo; Kim, Karam; Ohm, Tae Yoon; Yoon, Hyun; Joshi, Bhavana; Samuel, Edmund; Swihart, Mark T.; Choi, Sung Kyu; Park, Hyunwoong; Yoon, Sam S.
- Issue Date
- 1-2월-2018
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Bismuth vanadate nanopillar; Photoanode; Water splitting; Photocurrent density; Atomic layer deposition; Heterostructure
- Citation
- CHEMICAL ENGINEERING JOURNAL, v.333, pp.721 - 729
- Indexed
- SCIE
SCOPUS
- Journal Title
- CHEMICAL ENGINEERING JOURNAL
- Volume
- 333
- Start Page
- 721
- End Page
- 729
- ISSN
- 1385-8947
- Abstract
- We report the fabrication and the performance in photoelectrochemical water splitting of thin films of electrostatically sprayed nanotextured bismuth vanadate (BiVO4) pillars coated with thin ZnO/TiO2 passivation layers formed by atomic layer deposition. The thin ZnO and TiO2 layers deposited on the BiVO4 nanopillars formed a heterostructure that promoted electron-hole separation and the migration of electrons toward the ITO substrate. The photocurrent density (PCD) of the ZnO/TiO2 coated BiVO4 was 2.5 times higher (2.25 mA/cm(2) at 1.2 V (versus Ag/AgCl)) than that of pristine BiVO4 (0.9 mA/cm(2) at 1.2 V (versus Ag/AgCl)). We present incident/absorbed photon-to-current efficiency and electrochemical impedance measurements confirming that this improvement is a result of the heterojunction produced by the conformal ZnO/TiO2 coating and discuss the mechanism of this dramatic enhancement of PCD.
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Collections - College of Engineering > Department of Mechanical Engineering > 1. Journal Articles
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