Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/141087
Title: Robust N-doped carbon aerogels strongly coupled with iron – cobalt particles as efficient bifunctional catalysts for rechargeable Zn – air batteries
Authors: Fu, Gengtao
Liu, Yu
Chen, Yifan
Tang, Yawen
Goodenough, John B.
Lee, Jong-Min
Keywords: Engineering::Chemical engineering
Issue Date: 2018
Source: Fu, G., Liu, Y., Chen, Y., Tang, Y., Goodenough, J. B., & Lee, J.-M. (2018). Robust N-doped carbon aerogels strongly coupled with iron – cobalt particles as efficient bifunctional catalysts for rechargeable Zn – air batteries. Nanoscale, 10(42), 19937-19944. doi:10.1039/c8nr05812a
Journal: Nanoscale
Abstract: The rational design of highly-active and stable reversible oxygen electrocatalysts for both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) plays a key role in rechargeable metal–air batteries, yet remains a great challenge. Herein, a novel dual-crosslinked hydrogel strategy is proposed to synthesize a new type of carbon aerogel that anchors the iron–cobalt (FeCo) particles as a bifunctional oxygen catalyst. The proposed hydrogel composed of an organic/inorganic network can be easily obtained by initiating sol–gel polymerization of cyanometalates, chitosan and graphene oxide. After pyrolysis, FeCo nanocrystals can be in situ uniformly immobilized within the N-doped “dual-network” carbon aerogels (FeCo/N-DNC) with a robust 3D porous framework. When used as an electrocatalyst, the newly developed FeCo/N-DNC aerogels exhibit a positive onset potential (0.89 V) and half-wave potential (0.81 V) for the ORR and a low overpotential (0.39 V) at 10 mA cm−2 for the OER, while presenting excellent electrochemical stability after being tested for 10 000 s. More importantly, the FeCo/N-DNC driven Zn–air battery reveals a smaller charge/discharge voltage gap, higher power/energy density and better cycling stability than the costlier Pt/C + RuO2 mixture catalyst. Our findings provide a facile and feasible synthetic strategy for obtaining highly active and stable electrocatalysts.
URI: https://hdl.handle.net/10356/141087
ISSN: 2040-3364
DOI: 10.1039/c8nr05812a
Rights: © 2018 The Royal Society of Chemistry. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:SCBE Journal Articles

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