금속 산화물 지지체를 이용한 산소환원반응에 대한 전기화학 촉매 연구 동향

• Published in: 대한금속재료학회지 Vol. 61; no. 4; pp. 231 - 241
• Main Authors: 조유진, Yoo-jin Jo, 정원석, Won Suk Jung, 임보영, Boyoung Lim
• Format: Journal Article
• Language: Korean
• Published: 대한금속재료학회 05.04.2023
• Subjects: catalytic activity; metal oxide; oxygen reduction reaction; proton exchange membrane fuel cells; stability
• ISSN: 1738-8228

Global warming and air pollution have forced greater attention to new energy sources to replace fossil fuels. Among several eco-friendly energy sources, polymer electrolyte membrane fuel cells have been increasingly investigated since they have zero emissions, high energy density, and high energy efficiency. Carbon-supported Pt catalyst is generally used for the cathodic catalyst in polymer electrolyte membrane fuel cells. However, Pt/C catalysts corrode under start-up/shut-down conditions. Pt agglomeration, separation, and loss can occur due to the carbon corrosion, which results in a rapid performance loss. Metal oxide is a promising candidate as an alternative support since it shows high stability in the high potential. Of several metal oxides, titanium oxides and tin oxides have been widely investigated. Their performance is comparable to the Pt/C catalyst, and they have shown even higher durability than the Pt/C catalyst in accelerated stress tests simulating start-up/shut-down conditions. In this paper, we summarize the development of metal oxide supports for the Pt catalyst in the five most recent years. In recent studies, the characteristics of metal oxides have been varied using new synthesis methods, annealing temperature, precursors, and dopants, which results in enhanced ORR activity and durability. Advanced metal oxides have shown high durability and exhibited acceptable performance compared to the state-of-the-art Pt/C catalysts. (Received 16 October, 2022; Accepted 3 January, 2023)