Carbonate-coordinated cobalt co-catalyzed BiVO4/WO3 composite photoanode tailored for CO2 reduction to fuels
SCIE
SCOPUS
- Title
- Carbonate-coordinated cobalt co-catalyzed BiVO4/WO3 composite photoanode tailored for CO2 reduction to fuels
- Authors
- Kim, JH; Magesh, G; Kang, HJ; Banu, M; Kim, JH; LEE, JIN WOO; Lee, JS
- Date Issued
- 2015-07
- Publisher
- ELSEVIER SCIENCE BV
- Abstract
- We report here that cobalt carbonate (Co-Ci) is a tailored oxygen evolution electrocatalyst (OEC) from water on BiVO4/WO3 composite photoanode to drive photoelectrochemical reduction of CO2 to fuels on a Cu cathode. For water oxidation, Co-Ci/BiVO4/WO3 performed best in CO2-saturated KHCO3 (KCi, pH 7) electrolyte recording an exceptional photocurrent of 3.5 mA/cm(2) at 1.23 V-RHE under 1 sun illumination, and an onset potential of 0.2 V-RHE. In the photoanode-driven CO2 reduction, the Co-Ci/BiVO4/WO3 (photoanode)-Cu (cathode) system showed stable photocurrent and 51.9% faradaic efficiency (against water reduction to H-2) for CO and C-1-C-2 hydrocarbons, whereas the best known OEC cobalt phosphate (Co-Pi) was less stable and gave only 22.4% faradaic efficiency. Due to its high stability and CO2 reduction selectivity, the Co-Ci assisted system produced 11 times larger amount of CH4 than the Co-Pi assisted system in a continuous operation. (C) 2015 Elsevier Ltd. All rights reserved.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/35592
- DOI
- 10.1016/J.NANOEN.2015.04.022
- ISSN
- 2211-2855
- Article Type
- Article
- Citation
- NANO ENERGY, vol. 15, page. 153 - 163, 2015-07
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