산소 생성 반응 효율 향상을 위한 전해질 ∣ 패턴화된 CoBi ∣ 헤마타이트로 구성된 광전기화학적 계면에 대한 연구

다국어 초록 (Multilingual Abstract)

Photoelectrochemical Interface consists of Electrolyte ∣ Patterned CoBi ∣ Hematite for Efficient Water Oxidation Suyeon Lee Department of Chemistry, Kyung Hee University The reliance on fossil fuels significantly causes the acceleration of global warming, prompting an urgent need for renewable energy sources such as solar irradiation. The conversion of solar energy into chemical fuels is enabled by photoelectrochemical cells (PECs). However, the overall solar-to-chemical efficiency is still far from a prerequisite for the wide commercialization of PEC. One of the main reasons is that complex and inefficient processes from photon absorption by the semiconductors to the selective photogenerated charge transfer to chemicals in electrolytes. Our study presented herein includes an approach to improving the efficiency of photoelectrochemical reactions at the electrolyte ∣ catalyst ∣ semiconductor interface utilizing three-dimensionally patterned catalysts on the solution-processed metal oxide semiconductors. By introducing patterned catalysts, CoBi on the hematite (α−Fe2O3) nanorods utilizing photomask-free, light-guided electrodeposition, the location and distribution of catalyst on the photoelectrode could be directly controlled without any aids of the photolithography procedures. The electrolyte ∣ patterned catalyst ∣ α−Fe2O3 not only allows sufficient light absorption by the hematite in front-illumination configuration but also optimizes transport and transfer of photogenerated holes along the interface while minimizing the carrier recombination and parasitic light absorption/scattering by the catalytic layers. In this way, we could demonstrate the efficient design of PEC, especially for photoanodes that could be part of self-biased photoelectrodes in water electrolysis. Our research aims to better understand the photoelectrochemical interface consisting of the electrolyte ∣ catalyst ∣ semiconductor and the intricate photoelectrochemical mechanisms, potentially leading to improved PEC performance for widespread utilization. Keyword: Photoelectrochemical cells, Patterning, CoBi, Hematite, Mechanisms, Water splitting, Oxygen evolution reaction

목차 (Table of Contents)

• 제1장 서론 1
• 1.1 연구 배경 1
• 제2장 실험 ７
• 2.1 시약 및 기기 7
• 2.1.1 시약 7
• 2.1.2 기기 7
• 2.2 실험 방법 10
• 2.2.1 전극 제작 10
• 2.2.2 전기화학적 성능 평가 13
• 제3장 결과 및 고찰 15
• 3.1 전극 전기도금 및 표면 분석 15
• 3.1.1 전기도금 양상 확인 및 표면 분석 15
• 3.1.2 전극 전기도금 조건 최적화 20
• 3.1.3 촉매 덮임률 최적화 26
• 3.2 전극 성능 평가 29
• 3.2.1 산소 발생 성능 평가 29
• 3.2.2 정공의 긴거리 이동 효과 34
• 제4장 결론 37
• 참고문헌 41