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UIO‐66‐NH 2 ‐Derived Mesoporous Carbon Catalyst Co‐Doped with Fe/N/S as Highly Efficient Cathode Catalyst for PEMFCs
Author(s) -
Zheng Long,
Dong Yuanyuan,
Chi Bin,
Cui Zhiming,
Deng Yijie,
Shi Xiudong,
Du Li,
Liao Shijun
Publication year - 2019
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201803520
Subject(s) - catalysis , proton exchange membrane fuel cell , mesoporous material , materials science , membrane electrode assembly , inorganic chemistry , carbon fibers , reversible hydrogen electrode , cathode , chemical engineering , electrochemistry , electrolyte , electrode , chemistry , working electrode , composite material , composite number , organic chemistry , engineering
Efficient, low‐cost catalysts are desirable for the sluggish oxygen reduction reaction (ORR). Herein, UIO‐66‐NH 2 ‐derived multi‐element (Fe, S, N) co‐doped porous carbon catalyst is reported, Fe/N/S‐PC, with an octahedral morphology, a well‐defined mesoporous structure, and highly dispersed doping elements, synthesized by a double‐solvent diffusion‐pyrolysis method (DSDPM). The morphology of the UIO‐66‐NH 2 precursor is perfectly inherited by the derived carbon material, resulting in a high surface area, a well‐defined mesoporous structure, and atomic‐level dispersion of the doping elements. Fe/N/S‐PC demonstrates outstanding catalytic activity and durability for the ORR in both alkaline and acidic solutions. In 0.1 m KOH, its half‐potential reaches 0.87 V (vs reversible hydrogen electrode (RHE)), 30 mV more positive than that of a 20 wt% Pt/C catalyst. In 0.1 m HClO 4 , it reaches 0.785 V (vs RHE), only 65 mV less than that of Pt/C. The catalyst also exhibits excellent performance in acidic hydrogen/oxygen proton exchange membrane fuel cells. A membrane electrode assembly (MEA) with the catalyst as the cathode reaches 700 mA·cm ‐2 at 0.6 V and a maximum power density of 553 mW·cm ‐2 , ranking it among the best MEAs with a nonprecious metal catalyst as the cathode.