Lee, Youngbin Lee, Jeong Hee Lee, Dongwook Oh, Sion Park, Jongwook Im, Kyungmin Yoo, Sung Jong Kim, Jinsoo 2024-11-27T11:00:26Z 2024-11-27T11:00:26Z 2024-11-24 2024-11 1385-8947 https://pubs.kist.re.kr/handle/201004/151144 The oxygen reduction reaction (ORR) at the cathode of proton exchange membrane fuel cells is very slow. Therefore, platinum (Pt)-based catalysts are only used in practical applications. However, due to the high cost of Pt-based noble electrocatalysts, research is underway to reduce the use of noble metals or replace Pt-based noble catalysts. To reduce the total production cost of catalysts in fuel cells, a simple mass production process is required and the use of noble metals should be reduced. Metal？organic framework (MOF)-derived non-noble metal electrocatalysts have been extensively investigated as ORR catalysts due to their large surface area and open pore structure. However, MOF-based non-noble metal catalysts exhibit low catalytic activity and stability compared to commercial Pt-based catalysts. To address this problem, a small amount of precious metal is added to MOFs to enhance the performance of MOF-based electrocatalysts. In this study, we synthesized an ultra-low-loading Pt electrocatalyst (2.2- wt% Pt) supported on MOF-derived hollow Co, nitrogen-doped carbon (h-Co-NC). h-Co-NC was prepared by carbonizing the MOF@MOF core？shell structure. After carbonization, Pt was loaded using the polyol method, and a hollow and single-atomic Pt/h-Co-NC electrocatalyst was successfully synthesized by annealing. The synthesized hollow Pt/h-Co-NC electrocatalyst exhibited superior ORR performance and stability compared with non-hollow Pt/Co-NC. English Elsevier BV Low-loading platinum-cobalt electrocatalyst supported on hollow carbon for enhanced oxygen reduction reaction Article 10.1016/j.cej.2024.157072 1 Chemical Engineering Journal, v.500 Chemical Engineering Journal 500 N scie scopus 001348771400001 Engineering, Environmental Engineering, Chemical Engineering TEMPERATURE FUEL-CELLS PARTICLE-SIZE CATALYSTS PERFORMANCE EVOLUTION SHELL Platinum Ultra-low loading Hollow structure Oxygen reduction reaction PEMFC