Exploring highly efficient non-precious metal based catalysts for bifunctional oxygen electrode is crucial for rechargeable metal-air batteries.In this study,with MOFs as precursors,a facile coprecipitation method is designed to realize in-situ growth of the CoNi anchored carbon nanoparticle/nanotube(CoNi/N-CNN)hybrid,which can achieve the simultaneous maximum exposure of both oxygen evolution reaction(OER)and oxygen reduction reaction(ORR)active centers.Benefiting from the unique structure,the CoNi/N-CNN catalyst exhibits excellent electrocatalytic performance for ORR(Eonset=1.183 V,E1/2=0.819 V)and a low operating voltage of 1.718 V at 10 mA cm-2(Ej-10)for OER.Delightfully,the home-made rechargeable Zn-air battery with CoNi/N-CNN delivers a high discharge power density up to 209 mW cm-2,and an outstanding charge-discharge cycling stability.The boosted bifunctional elec-trocatalytic activity can be ascribed to the strong coupling effect between Co/Ni center sites and defect-rich N-anchored carbon featured with porous and nanotube structure,which can introduce uniformly dispersed active sites,tailored electronic configuration,superb conductivity and convenient charge trans-fer process.The hybrid non-precious bimetal based electrocatalyst provides the possibility to develop the low-cost and high-efficient ORR/OER bifunctional electrocatalysts in rechargeable metal-air battery.

Jun Li;Yongxia Wang;Zhengyu Yin;Rui He;Yihao Wang;Jinli Qiao

State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,College of Environmental Science and Engineering,Donghua University,Shanghai 201620,China;Shanghai Institute of Pollution Control and Ecological Security,Shanghai 200092,China

能源化学

[1]Jun Li;Yongxia Wang;Zhengyu Yin;Rui He;Yihao Wang;Jinli Qiao-.In-situ growth of CoNi bimetal anchored on carbon nanoparticle/nanotube hybrid for boosting rechargeable Zn-air battery)[J].能源化学,2022(03):348-355

Delightfully

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