TY  - JOUR
T1  - Low-loading platinum–cobalt electrocatalyst supported on hollow carbon for enhanced oxygen reduction reaction
AU  - Lee, Youngbin
AU  - Lee, Jeong Hee
AU  - Lee, Dongwook
AU  - Oh, Sion
AU  - Park, Jongwook
AU  - Im, Kyungmin
AU  - Yoo, Sung Jong
AU  - Kim, Jinsoo
JO  - Chemical Engineering Journal
VL  - 500
SP  - 157072
PY  - 2024
DA  - 2024/11/15/
SN  - 1385-8947
DO  - https://doi.org/10.1016/j.cej.2024.157072
UR  - https://www.sciencedirect.com/science/article/pii/S1385894724085632
KW  - Platinum
KW  - Ultra-low loading
KW  - Hollow structure
KW  - Oxygen reduction reaction
KW  - PEMFC
AB  - 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.
ER  -