Ni dispersed ultrathin carbon nanosheets as bi-functional oxygen electrocatalyst induced from graphite-like porous supramolecule

Journal Publication ResearchOnline@JCU
Zhou, Shunfa;Zheng, Guoli;Ji, Feng;Wang, Jiatang;Liu, Zhao;shi, Jiawei;Li, Jing;Hu, Yang;Deng, Chengwei;Fan, Liyuan;Cai, Weiwei
Abstract

Excellent porosity and accessibility are key requirements during carbon-based materials design for energy conversion applications. Herein, a Ni-based porous supramolecular framework with graphite-like morphology (Ni-SOF) was rationally designed as a carbon precursor. Ultrathin carbon nanosheets dispersed with Ni nanoparticles and Ni-Nx sites (Ni@NiNx-N-C) were obtained via in-situ exfoliation during pyrolysis. Due to the hetero-porous structure succeeding from Ni-SOF, the Ni@NiNx-N-C catalyst showed outstanding bifunctional oxygen electrocatalytic activity with a narrow gap of 0.69 V between potential to deliver 10 mA cm−2 oxygen evolution and half-wave potential of oxygen reduction reaction, which even surpassed the Pt/C + IrO2 pair. Therefore, the corresponding zinc-air battery exhibited excellent power output and stability. The multiple Ni-based active sites, the unique 2D structure with a high graphitization degree and large specific surface area synergistically contributed to the excellent bifunctional electrocatalytic activity of Ni@NiNx-N-C. This work provided a novel viewpoint for the development of carbon-based electrocatalyst.

Journal

Journal of Colloid and Interface Science

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Volume

652

ISBN/ISSN

1095-7103

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Pages Count

10

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Publisher

Elsevier

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EISSN

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DOI

10.1016/j.jcis.2023.08.182