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Journal of Colloid and Interface Science

Journal of Colloid and Interface Science

IF: 9.4
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Co/CoO hetero-nanoparticles incorporated into lignin-derived carbon nanofibers as a self-supported bifunctional oxygen electrocatalyst for rechargeable Zn-air?…

Published:7 December 2024 DOI: 10.1016/j.jcis.2024.12.035 PMID: 39657415
Yali Wang,?Ruihui Gan,?Xiaodong Shao,?Binting Dai,?Lin Ma,?Jinzheng Yang,?Jingli Shi,?Xiangwu Zhang,?Chang Ma,?Zhanshuang Jin

Abstract

The large-scale application of rechargeable Zn-air batteries (ZABs) necessitates the development of high-efficiency and cost-effective bifunctional electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Herein, the density functional theory calculations were performed to reveal the charge redistribution induced by the Co/CoO heterojunction integrating with N-doped carbon, which could optimize the d-band center, thereby accelerating O2 transformed into OOH* in the ORR and the conversion of O* into OOH* in OER. Guided by theoretical calculations, Co/CoO hetero-nanoparticles-decorated lignin-derived N-doped porous carbon nanofibers (Co-LCFs-800) were synthesized to use as an advanced self-supported bifunctional oxygen electrocatalyst. Consequently, Co-LCFs-800 shows a half-wave potential of 0.834?V in ORR and an overpotential of 354?mV at 10?mA cm-2 in OER. The Co-LCFs-800-based liquid ZABs afford an admirable performance with a large specific capacity of 780.8 mAh g-1, and the Co-LCFs-800-based solid-state ZABs exhibit satisfactory mechanical flexibility and cycling stability. The results suggest that the integration of hetero-nanoparticles into carbon nanofibers holds promise for oxygen cathode in ZABs.

Substances (5)

Materials
Procduct Name CAS Molecular Formula Supplier Price
N,N-Dimethylformamide 68-12-2 C3H7NO 1313 suppliers $11.20-$12200.00
Oxygen 7782-44-7 O2 822 suppliers $39.00-$6603.14
Poly(vinyl alcohol) 9002-89-5 C2H4O 774 suppliers $13.00-$4353.77
Nitrogen 7727-37-9 N2 385 suppliers $368.00-$6570.80
Nitrogen 7727-37-9 N2 385 suppliers $368.00-$6570.80
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