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| Type |
Symposium |
| Area |
Recent Advances in Analytical Chemistry I: Advanced Materials and Instrument in Analytical Chemistry |
| Room No. |
303호 |
| Time |
THU 15:00-: |
| Code |
ANAL1-5 |
| Subject |
Application of Electroanalytical Methods in Artificial Photosynthesis |
| Authors |
안현서
연세대학교 화학과, Korea |
| Abstract |
Conversion of solar energy into transportable liquid fuels has been an important research theme in physical sciences for the last decade. Many artificial photosynthetic devices have been built with numerous iterations and enhancements, yet all fall short of the biological machinery. In the current presentation, two major problems in artificial photosynthesis will be discussed: 1) limited lifetime of the photo-absorber due to oxidative degradation and 2) deficient understanding of the complex oxygen evolution reaction (OER). In the first part of the presentation, a proof-of-concept photo-anodic device for OER will be demonstrated. Prolonged use of corrosion sensitive n-type silicon was made possible in water by application of an electrodeposited thin passivating layer of TiO2. A rare metal/insulation/semiconductor junction was employed for solution electrochemistry boasting an OER current density of 19 mA/cm2 that is indefinitely stable. In the second part of the talk, an investigation of the catalytic OER surface processes will be presented. By use of a redox titration experiment, the redox processes occurring at the surface of metal oxides during OER were investigated. The unique surface selectivity of the analytical technique employed here allowed for the selective data analyses of the processes occurring exclusively at the solid-solution interface independent from the participation of the signals from the bulk of the catalyst material. The results pertaining to the OER kinetic parameters and the key intermediates will be presented. |
| E-mail |
ahnhs@yonsei.ac.kr |
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119th General Meeting of the KCS