期刊
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
卷 45, 期 10, 页码 15534-15543出版社
WILEY
DOI: 10.1002/er.6796
关键词
bimetallic CoFe‐ NC; leaf‐ shaped ZIF; oxygen– reduction reaction; PEMFC; stability
资金
- Korea Institute of Science and Technology [2E30380, 2Z06370-20-232]
- National Research Foundation of Korea [2018M1A2A2061975, 2019R1A2B5B03004854, 2019R1A2C1090693]
- Korea Institute of Energy Technology Evaluation and Planning [20203020030010]
- National Research Foundation of Korea [2019R1A2B5B03004854, 2019R1A2C1090693] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The study synthesized core-shell-type leaf-shaped CoFe-NC catalysts, achieving highly dispersed CoFe-doped carbon with excellent performance and durability in acidic medium. When applied as a cathode in PEMFC, the catalyst demonstrated significant effectiveness.
Platinum-free electrocatalysts for oxygen-reduction reactions in acidic medium are challenging as the cathode of PEMFC. Here, we synthesized core-shell-type leaf-shaped CoFe-NC (L-CoFe-NC) catalysts using 2D ZIFs as cores and 3D ZIFs as shells. The amounts of Co and Fe were carefully controlled to obtain highly dispersed CoFe-doped carbon. This strategy made it easy to tune the catalyst while maintaining the advantages of the 2D structures. The prepared L-CoFe-NC showed a half-wave potential (E-1/2) of 0.77 V and an onset potential (E-onset) of 0.88 V in 0.5 M H2SO4. In addition, the results confirmed high durability even after 10 000 tests while retaining excellent performance. This outstanding stability was achieved owing to the high dispersion of Co and Fe in the 2D carbon frame. Furthermore, PEMFC was evaluated using an MEA containing L-CoFe-NC catalysts as a cathode.
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