Journal
NANO ENERGY
Volume 100, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2022.107466
Keywords
Anion exchange membrane fuel cells; Oxygen reduction reaction; Fe-N-C catalysts; Ag nanoparticles; Synergistic effect
Categories
Funding
- National Key Research and Development Project of China [2019YFA0210300]
- Outstanding Talent Fund from BUCT
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This study constructs a composite catalyst of AgNPs@Fe-N-C, which demonstrates outstanding ORR performance and durability in alkaline condition. AEMFC based on this composite catalyst shows high peak power density and long-term device durability, surpassing Fe-N-C-based AEMFC.
Anion exchange membrane fuel cells (AEMFCs) are hopeful clean energy equipment due to the mild reaction condition and the possibility of using Pt-free catalysts for cathodic oxygen reduction reaction (ORR). Developing excellent Pt-free ORR catalysts for AEMFC is still of great significance. Here, we construct a composite catalyst (AgNPs@Fe-N-C) of Ag nanoparticles (NPs) surrounded by the atomically dispersed Fe-N-C porous carbon. The AgNPs@Fe-N-C demonstrates outstanding ORR performance and enhanced durability, and its half-wave potential obviously exceeds AgNPs-N-C and Fe-N-C counterparts in alkaline condition. Impressively, the AgNPs@Fe-N-Cbased AEMFC exhibits not only the ultrahigh peak power density of 0.848 W cm-2, but also long-term device durability of 200 h in H2/air (CO2-free) system, which is obviously better than that of the Fe-N-C-based AEMFC. Density functional theory (DFT) calculations further reveal the synergistic effect of Ag NPs and Fe-N-C for ORR. In short, this work provides a new route to develop high activity and robust Pt-free ORR catalysts for AEMFCs.
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