Byeon, Ayeong Lee, Kyung Jin Lee, Min Jae Lee, Ju Sung Lee, In Hyuk Park, Hee-Young Lee, So Young Yoo, Sung Jong Jang, Jong Hyun Kim, Hyoung-Juhn Kim, Jin Young 2024-01-19T22:31:22Z 2024-01-19T22:31:22Z 2021-09-03 2018-07 2196-0216 https://pubs.kist.re.kr/handle/201004/121215 Owing to the high cost of technologies utilizing the oxygen reduction reaction (ORR) in fuel cell applications, considerable efforts have been recently made to develop non-precious metal electrocatalysts for the commercialization of the low-temperature polymer electrolyte membrane fuel cells (LT-PEMFCs). By extension, non-precious-metal electrocatalysts can be a cost-effective solution for the commercialization of high-temperature PEMFCs (HT-PEMFCs). However, no previous reports have been published regarding the applicability. Herein, we demonstrate that a hierarchical mesoporous iron and nitrogen co-doped carbon (Fe/N/C) electrocatalyst is able to efficiently electrocatalyze the ORR in a phosphoric acid electrolyte with a half-wave potential of 0.72 V (only 170 mV deviation from conventional Pt/C) and high selectivity (electron-transfer number > 3.95) with a mild overpotential. Furthermore, we fabricated HT-PEMFC devices on the basis of hierarchical mesoporous Fe/N/C electrocatalysts and non-aqueous electrolytes, which exhibited a high performance, over 20 mW/cm (2). Besides, the optimal hierarchical porosity of the mesoporous Fe/N/C catalyst contributes to its high ORR activity. It is considered that it provides a large surface area for electrocatalytic ORR, and improves the proton and oxygen transport properties. English WILEY-V C H VERLAG GMBH Effect of Catalyst Pore Size on the Performance of Non-Precious Fe/N/C-Based Electrocatalysts for High-Temperature Polymer Electrolyte Membrane Fuel Cells Article 10.1002/celc.201800093 1 CHEMELECTROCHEM, v.5, no.14, pp.1805 - 1810 CHEMELECTROCHEM 5 14 1805 1810 N scie scopus 000438339200006 2-s2.0-85047436048 Electrochemistry Electrochemistry Article OXYGEN REDUCTION REACTION CATHODE CATALYST ACTIVE-SITES IRON POLYBENZIMIDAZOLE NANOSPHERES PEMFC LEVEL HT-PEMFC non-precious metal catalysts oxygen reduction reaction oxygen transport resistance proton transport resistance