Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 569, Issue -, Pages 267-276Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2020.02.086
Keywords
Metal-organic frameworks; Co-N-x moiety; Metal alloy; Carbon network; Oxygen reduction reaction
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Funding
- National key research and development program of China [2018YFB1502903]
- National Natural Science Foundation of China [21103024, 21603072, 61171008]
- Zhejiang Provincial Natural Science Foundation of China [LY19B060006, LQ20E030016]
- Technology Development Project of Jiaxing University
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Cost-effective electrocatalysts with excellent oxygen reduction reaction (ORR) activity are requisite for the commercial application fuel cells and zinc-air batteries. Herein, we prepare a series of carbon-based nonprecious metal catalysts by simply carbonizing the mixture of FeCo-ZIF, melamine and soya-bean oil. The microstructure and electrochemical activity of the prepared catalysts highly depend on the adding amount of FeCo-ZIF. With proper addition, the FeCo-ZIF are transformed into Co5.47N and Co0.72Fe0.28 alloy nanoparticles, which are embedded in the in situ formed carbon network consisted of nitrogen-doped graphene-like carbon nanosheets and interwoven carbon nanotubes. The resulted catalyst (FeCo@NCs-0.15) with considerable specific surface area and high pore volume demonstrates a superior ORR catalytic activity than commercial Pt/C with a half-wave potential (E-1/2) of 0.83 V (vs. RHE), onset potential (E-onset) of 0.97 V (vs. RHE) and 4-electron dominated reaction path. The durability and methanol resistance are also better than that of commercial Pt/C in alkaline solution. This study provides an inexpensive, facile and scalable strategy to simultaneously realize non-precious metal-based active sites, nitrogen-doping, porosity and highly conductive carbon matrix in one electrocatalyst by one step. (C) 2020 Elsevier Inc. All rights reserved.
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