Cobalt Oxide Nanoparticles Embedded in N‐Doped Porous Carbon as an Efficient Electrode for Supercapacitor

Energy Technology - Tập 7 Số 4 - 2019
Maiyong Zhu1, Qi Chen1, Jiarui Kan1, Jingjing Tang1, Wenjing Wei1, Jinkun Lin1, Songjun Li1
1School of Materials Science & Engineering Jiangsu University Zhenjiang Jiangsu Province 212013 P. R. China

Tóm tắt

Herein, a sequential pyrolysis and oxidation strategy is developed to prepare Co3O4 nanoparticles embedded in N‐doped porous carbon (Co3O4@N‐pC) using a bimetal zeolitic imidazolate framework (ZIF‐67@ZIF‐8) as precursors, which is first obtained via a simple wet‐chemical process. The electrochemical performances of Co3O4@N‐pC, ZIF‐67@ZIF‐8 precursors, and Co@N‐Pc intermediates (the direct pyrolysis products from ZIF‐67@ZIF‐8) are studied as supercapacitor electrodes in comparison. The results reveal that the specific capacitance of the optimized Co3O4@N‐pC electrode can reach up to 422.8 F g−1 at 1 A g−1 with a good rate capability (256 F g−1 at 5 A g−1) and excellent long‐term cycling stability (87.9% retention after 5000 cycles). Such performance is superior over ZIF‐67@ZIF‐8 precursors (232 F g−1 at 1 A g−1, 168.9 F g−1 at 5 A g−1, and 82.7% retained after 5000 cycles) and Co@N‐pC intermediates (218.4 F g−1 at 1 A g−1, 171 F g−1 at 5 A g−1, and 76.3% retained after 5000 cycles). The findings in this work are expected to provide a new avenue to explore other metal oxide/carbon materials for various applications.

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Energy Technology

Tập 7 Số 4

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