期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 141, 期 27, 页码 10744-10750出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.9b03561
关键词
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资金
- Center for Alkaline-Based Energy Solutions (CABES)
- Center for Energy Materials at Cornell (emc2), Energy Frontier Research Center (EFRC) program - U.S. Department of Energy [DE-SC-0019445]
- DOE [DE-SC-0019445]
- National Science Foundation Materials Research Science and Engineering Center NSF MRSEC program [DMR-1719875]
The oxygen reduction reaction (ORR) is considered the cornerstone for regenerative energy conversion devices involving fuel cells and electrolyzers. The development of non-precious-metal electrocatalysts is of paramount importance for their large-scale commercialization. Here, Co-Fe binary alloy embedded bimetallic organic frameworks (BMOF)s based on carbon nanocomposites have been designed with a compositionally optimized template, by a facile host-guest strategy, for ORR in alkaline media. The electrocatalyst exhibits promising electrocatalytic activity for ORR with a half-wave potential of 0.89 V in 0.1 M NaOH, comparable to state-of-the-art Pt/C electrocatalysts. More importantly, it exhibits robust durability after 30 000 potential cycles. Scanning transmission electron microscopy (STEM) and quantitative energy-dispersive Xray (EDX) spectroscopy suggest that the Co-Fe alloy nanoparticles have a homogeneous elemental distribution of Co and Fe at the atomic-scale optimized BMOF and Co/Fe ratio of 9:1. The long-term durability is attributed to its ability to maintain its structural and compositional integrity after the cycling process, as evidenced by STEM-EDX analysis. This work provides valuable insights into the design and fabrication of novel platinum-group-metals-free highly active ORR electrocatalysts in alkaline media.
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