태양광 조사하에서의 유기 오염 물질 및 박테리아의 광전기화학적 분해 및 불활성을 향상시키기 위한 NiFeOx 조촉매가 포함된 Ge/Zr 공동 도핑 α-Fe2O3 광음극 소재에 관한 연구 = Study on Ge/Zr Co-Doped α-Fe2O3 Photoanode Modified with NiFeO? Cocatalyst for Enhanced Photoelectrochemical Degradation and Inactivation of Organic Pollutants and bacteria under Solar Light

다국어 초록 (Multilingual Abstract)

Ge/Zr co-doped α-Fe2O3 photoanodes decorated with NiFeOx cocatalysts were fabricated for enhanced visible-light-driven photocatalytic degradation of organic dyes and bacterial contaminants. Incorporating Ge4+ increased carrier density and electrical conductivity, facilitating bulk charge transport, while Zr4+ modulated surface states and suppressed surface recombination. NiFeOx cocatalysts further promoted surface charge separation by accelerating the utilization of holes through the oxygen evolution reaction (OER). In dye degradation experiments, adding Cu2+ ions significantly boosted reactive oxygen species (ROS) generation via a Fenton-like redox cycle between Cu2+/Cu+, leading to increased production of ∙O2– and ∙OH radicals. Under optimized conditions, the NiFeOx/Zr–Ge–Fe2O3 electrode achieved > 75% degradation of Orange II dye, > 65% degradation of BPA and bacterial inactivation up to 98% under simulated sunlight. Scavenger experiments confirmed that ∙O2– was the dominant reactive species, with ∙OH and photogenerated holes contributing synergistically. Electrochemical impedance spectroscopy revealed that Cu2+ introduction improved interfacial charge, highlighting the combined role of cocatalyst and redox mediator in optimizing charge transport and reaction kinetics. This work demonstrates a synergistic strategy that integrates elemental co-doping, cocatalyst decoration, and redox mediation for the efficient photoelectrochemical degradation of pollutants.

목차 (Table of Contents)

• Abstract II
• 제1장 Introduction 1
• 제2장 Experimental Section 6
• 제3장 Results and Discussion 11
• 제4장 Conclusions 51
• 제5장 References 52