Journal article
Reflection Optical Imaging to Study Oxygen Evolution Reactions
Journal of the Electrochemical Society, Vol.169(5), 057507
05/05/2022
DOI: 10.1149/1945-7111/ac690a
Abstract
Discovery of high-efficiency water-splitting catalysts is critical for clean hydrogen fuel generation. Quantitative and reliable chemical imaging methods can play a crucial role in providing critical catalyst efficiency information for materials development and screening. Here, we developed a reflection optical imaging method to map the performance of transition metal oxide catalysts for oxygen evolution reaction (OER). The generated high concentration of oxygen in the electrolyte will decrease the refractive index of the solutions near the electrode and change the reflectivity of optical images. We successfully imaged and measured the OER on cobalt oxide, and the localized current density and overpotential distribution maps have been extracted. The oxidation and reduction of cobalt oxide can be imaged with our reflection optical imaging method as well. These maps showed that the catalytic activities are quite different at different locations, and some regions showed much higher activities. This is due to the non-uniformity created by the catalyst synthesis process and demonstrates the importance of using the optical imaging method to map the localized catalytic efficiency. In addition, the NiFe alloy's OER catalytic activities have been studied as well. The proposed reflection optical imaging method could find many applications in catalyst activity measurement and screening.
Details
- Title: Subtitle
- Reflection Optical Imaging to Study Oxygen Evolution Reactions
- Creators
- Xu Yang - University of HoustonJonathan G Koonce - University of IowaYing-Chau Liu - University of HoustonGuangxia Feng - University of HoustonYaping Shi - University of HoustonXiaoliang Li - University of HoustonSyed Mubeen - University of IowaXiaonan Shan - University of Houston
- Resource Type
- Journal article
- Publication Details
- Journal of the Electrochemical Society, Vol.169(5), 057507
- Publisher
- IOP Publishing
- DOI
- 10.1149/1945-7111/ac690a
- ISSN
- 0013-4651
- eISSN
- 1945-7111
- Number of pages
- 7
- Grant note
- DE-FE-0032092; DEFE0031704 / Department of Energy
- Language
- English
- Date published
- 05/05/2022
- Academic Unit
- Civil and Environmental Engineering; Chemical and Biochemical Engineering
- Record Identifier
- 9984256868902771
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