Photodeposited CoOx as highly active phases to boost water oxidation on BiVO4/WO3 photoanode |
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| Affiliation: | 1. School of Engineering, University of Applied Sciences, Goebenstrasse 40, 66117 Saarbrücken, Germany;2. Laboratory Materials for Energy Conversion, Empa, Überlandstrasse 129, 8600 Dübendorf, Switzerland;3. Laboratory of Advanced Analytical Technologies, Empa, Überlandstrasse 129, 8600 Dübendorf, Switzerland;1. Institute of Environmental and Analytical Sciences, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, Henan, 475004, PR China;2. College of Environment and Chemical Engineering, Dalian University, Dalian, 116622, PR China;1. Division of Biotechnology, Safety, Environment and Life Science Institute, College of Environmental and Bioresource Sciences, Chonbuk National University, Iksan, 54596, Republic of Korea;2. Korea Basic Science Institute, Jeonju, Jeollabuk-do, 54907, Republic of Korea;3. Pohang Accelerator Laboratory (PAL), Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea;4. Daegu Center, Korea Basic Science Institute, Daegu, 41566, Republic of Korea;1. School of Materials Science and Engineering, Tianjin Chengjian University, 300384, Tianjin, China;2. Tianjin Key Laboratory of Building Green Functional Materials, 300384, Tianjin, China;3. School of Civil Engineering and Architecture, Xinxiang University, Xinxiang, 453003, China;1. Department of Materials Science and Engineering, Zhejiang Normal University, Jinhua, 321004, China;2. Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua, 321004, China |
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| Abstract: | Surface decoration of photoanodes with oxygen evolution cocatalysts is an efficient approach to improve the photoelectrochemical water splitting performance. Herein, ultrafine CoOx was selectively immobilized on the surface of BiVO4/WO3 photoanode by using the photogenerated holes to in-situ oxidize Co4O4 cubane. The composited photoanode (CoOx/BiVO4/WO3) displayed an enhanced photoelectrochemical (PEC) water oxidation performance, with a photocurrent density of 2.3 mA/cm2 at 1.23 VRHE under the simulated sunlight irradiation, which was 2 times higher than that of bare BiVO4/WO3. The characterization results for the morphological, optical and electrochemical properties of the photoelectrodes revealed that, the enhanced PEC performances could be attributed to the improved charge carrier separation/transport behaviors and the promoted water oxidation kinetics when the photoelectrodes were loaded with CoOx. |
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| Keywords: | Photodeposition Cocatalyst Water splitting |
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