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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 | Schools: | School of Chemical and Biomedical Engineering | Organisations: | Maritime Institute | 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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