Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 22, Issue 14, Pages 7218-7223Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0cp00109k
Keywords
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Funding
- Key Program of the Chinese Academy of Sciences [KFZD-SW-320]
- China Postdoctoral Science Foundation [2019M652155]
- Opened Fund of the State Key Laboratory on Integrated Optoelectronics [IOSKL2017KF08M]
- Ningbo 3315 program
- Science & Technology Innovation Major Program of Ningbo (Ningbo 2025 Program) [2018B10056]
- ICR-iJURC (Institute for Chemical Research-International Joint Usage/Research Center) collaboration program
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A key challenge in carrying out an efficient oxygen reduction reaction (ORR) is the design of a highly efficient electrocatalyst that must have fast kinetics, low cost and high stability for use in an energy-conversion device (e.g. metal-air batteries). Herein, we developed a platinum-free ORR electrocatalyst with a high surface area and pore volume via a molten salt method along with subsequent KOH activation. The activation treatment not only increases the surface area to 940.8 m(2) g(-1) by generating lots of pores, but also promotes the formation of uniform Fe3C nanoclusters within the atomic dispersed Fe-N-x carbon matrix in the final material (A-FeNC). A-FeNC displays excellent activity and long-term stability for the ORR in alkaline media, and shows a greater half-wave potential (0.85 V) and faster kinetics toward four-electron ORR as compared to those of 20 wt% Pt/C (0.83 V). As a cathode catalyst for the Zn-air battery, A-FeNC presents a peak power density of 102.2 mW cm(-2), higher than that of the Pt/C constructed Zn-air battery (57.2 mW cm(-2)). The superior ORR catalytic performance of A-FeNC is ascribed to the increased exposure of active sites, active single-atom Fe-N-C centers, and enhancement by Fe3C nanoclusters.
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