Fabrication of Nanostructured Electrodes for Artificial Photosynthesis : Hematite and CoOx /Tantalum Oxynitride Composite Thin Films as Photoanode and Cathode
- 발행기관 서강대학교 일반대학원
- 지도교수 강영수
- 발행년도 2016
- 학위수여년월 2016. 2
- 학위명 석사
- 학과 및 전공 일반대학원 화학과
- 실제URI http://www.dcollection.net/handler/sogang/000000058727
- 본문언어 영어
- 저작권 서강대학교 논문은 저작권보호를 받습니다.
초록/요약
Chapter 1. Enhanced Photocurrent Density of Hematite Thin Films on FTO Substrates: Effect of Post-Annealing Temperature Fluorine doped tin oxide (FTO) is widely used substrate in synthesizing photo-reactive semiconductor electrode for solar water splitting. Hematite film on the surface of FTO substrate annealed at 700 °C showed an enhanced photocurrent value as maximum photocurrent of 0.39 mA/cm2 at 1.23 V vs. RHE under 1 sun illumination. This is much enhanced photocurrent value of the hematite films than those annealed at lower temperature than 700 oC. This is a promising approach for the enhancement of photoelectrochemical properties of metal oxide thin films. This work reports on the mechanism of the annealing process of the synthesized hematite film to enhance the photocurrent value. This can be used for the enhanced efficiency of solar water splitting reaction furthermore.
more초록/요약
Chapter 2. Photoelectrochemical Reduction of CO2 to Formic Acid using CoOx /Tantalum Oxynitride Composite as Cathode Among various solar energy conversion studies, artificial photosynthesis has been regarded as one of the most promising way to utilize the solar energy. Tantalum oxynitride (TaON) electrode was synthesized with dispersed cobalt oxide as a cathode of the CO2 reduction reaction. As the conduction band edge of TaON is -0.4 V vs. NHE (pH=0) and the band gap is about 2.4 eV, it could be used as appropriate material as an electrode. Artificial photosynthesis reaction was carried out with synthesized CoOx/TaON film as a cathode and formic acid was produced. This work reported about the possibility of CoOx/TaON electrode as a promising cathode for CO2 reduction reaction.
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