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Issue 12, 2019
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Coupled nanocomposite Co5.47N–Co3Fe7 inlaid in a tremella-like carbon framework as a highly efficient multifunctional electrocatalyst for oxygen transformation and overall water splitting

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Abstract

Electrocatalysts with high activity, low cost and long-term durability for oxygen transformation and water splitting are highly desirable for realizing large-scale commercial application of renewable energy technologies, such as metal–air batteries and water splitting cells, but finding them remains a great challenge. Herein, a graphene/nanotube-constructed tremella-like carbon framework with 3D open aisles embedded with coupled Co5.47N and Co3Fe7 nanoparticles (Co5.47N@Co3Fe7/N-Cs) was created via a hydrothermal–pyrolysis strategy. The mutual entanglement and connection of the nanosheets and nanotubes creates a carbon network with a hierarchically porous structure and multifarious active centers such as Fe–Co, Co(Fe)–Nx moieties and nitrogen-doped carbon (N-C) co-existing on the surface of the prepared Co5.47N@Co3Fe7/N-Cs, exhibiting excellent trifunctional electrocatalytic performance for the ORR, OER and HER. A primary zinc–air battery assembled with Co5.47N@Co3Fe7/N-C-900 gains an advantage over its Pt/C-based counterparts. Besides, the performance of an overall water splitting device using Co5.47N@Co3Fe7/N-C-900 as the electrode material is comparable to that of a Pt/C–IrO2 pair-assembled cell. To the best of our knowledge, this is a top-notch trifunctional electrocatalyst for the ORR, HER and OER in comparison to those reported so far. This work provides an effective strategy to prepare high-performance trifunctional electrocatalysts with excellent catalytic performance and wide application prospects in the sustainable energy conversion field.

Graphical abstract: Coupled nanocomposite Co5.47N–Co3Fe7 inlaid in a tremella-like carbon framework as a highly efficient multifunctional electrocatalyst for oxygen transformation and overall water splitting

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Publication details

The article was received on 15 Aug 2019, accepted on 01 Oct 2019 and first published on 05 Oct 2019


Article type: Paper
DOI: 10.1039/C9SE00657E
Sustainable Energy Fuels, 2019,3, 3538-3549

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    Coupled nanocomposite Co5.47N–Co3Fe7 inlaid in a tremella-like carbon framework as a highly efficient multifunctional electrocatalyst for oxygen transformation and overall water splitting

    F. Kong, C. Zhang, Y. Qiao, R. Li, A. Kong and Y. Shan, Sustainable Energy Fuels, 2019, 3, 3538
    DOI: 10.1039/C9SE00657E

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