首页|ZIF-derived zinc decorated cobalt nanoparticles for efficient oxygen reduction and Zn-air batteries
ZIF-derived zinc decorated cobalt nanoparticles for efficient oxygen reduction and Zn-air batteries
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NSTL
Elsevier
? 2022 Elsevier B.V.Cobalt-nitrogen-doped carbon (Co-N-C) materials are regarded as promising candidates to replace Pt-based catalysts for oxygen reduction reaction (ORR). Introducing Zn species with a small electronegativity to form Co/Zn-N-C catalysts could promote the electron transfer and enhance the ORR activity. Herein, we report Zn-anchored Co nanoparticles encapsulated in porous N-doped carbon ((Zn, Co)/NC) derived from Zn/Co-ZIF-67. Compared with the catalyst without Zn, (Zn, Co)/NC exhibits higher ORR catalytic activities in alkaline and acidic media with outstanding methanol tolerance and stability. The assembled Zn-air battery used (Zn, Co)/NC presents higher peak power density (186 mW·cm?2) and specific capacity (807 mAh·g?1) than those of Pt/C. The density functional theory (DFT) calculations demonstrate Zn atoms on Co NPs induce more charges transfer from inner metal NPs to carbon shell, leading to more charges accumulation around N-C active sites to activate O2 and reducing the energy barrier of (Zn, Co)/NC for ORR.
Wang X.、Sun Y.、Jiang Z.、Zhang L.、Li D.、Zhao X.、Yang D.、Cai R.、Ren J.
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School of Environmental Science and Engineering State Key Laboratory of Bio-fibers and Eco-textiles Shandong Collaborative Innovation Center of Marine Bio-based Fibers and Ecological Textiles Qingdao University
Nanoscale Physics Research Laboratory School of Physics and Astronomy University of Birmingham
School of Chemical and Environmental Engineering North University of China
NSTL
Elsevier
