Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 242, Issue -, Pages 209-217Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2018.09.044
Keywords
Non-precious metal electrocatalyst; Cytochrome c oxidase; Al-air batteries; Oxygen reduction reaction; Density functional theory calculations
Funding
- National Nature Science Foundation of China [21571189, 21671200]
- Hunan Provincial Science and Technology Plan Project, China [2016TP1007, 2017TP1001]
- Innovation-Driven Project of Central South University [2016CXS009]
- High Performance Computing Center of CSU, China
- Guangdong Special Fund for Science and Technology Development (Hong Kong Technology Cooperation Funding Scheme) [201604030012, 201704030019, 201704030065]
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Iron and nitrogen co-doped carbon materials (Fe-N-C) have been widely investigated as one of the most promising electrocatalysts with low cost and excellent catalytic activity towards oxygen reduction reaction (ORR). Herein, inspired by the cytochrome c oxidase (CcO), we have proposed a high-performance bimetal Cu/Fe-regulating nitrogen-doped carbon (Cu-Fe-N-C) electrocatalyst via using partial copper substitution to iron in Fe-N-C. The optimized Cu-Fe-N-C composite displays much better catalytic activity than the pristine Fe-N-C indicated by 20 mV positive shift of onset potential (0.967 V vs RHE), 25 mV positive shift of half-wave potential (0.864 V vs RHE) and higher limiting-current density. The significantly enhanced performance is also manifested by a higher discharging cell voltage and better stability in practical Al-air batteries at a constant current density. Both experimental and computational results confirm that the significantly enhanced performance should be mainly ascribed to the synergistic effects of the bimetallic doping in Cu-Fe-N-C catalysts.
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