Abstract
BackgroundThe rechargeable zinc-air battery performance relies heavily on its ability to execute oxygen conversion reaction in the air electrode under the charging/discharging process. Thus, developing a robust and highly efficient bifunctional oxygen electrocatalyst is crucial. MethodsHerein, by utilizing the feature of partial transformation for ZIF-67, the unique hybrid architecture of Co3O4 residing inside NiCo layered double hydroxide (Co3O4@NiCo-LDH) decorated on N-doped carbon nanotubes (N-CNTs) is designed. The initial etching of ZIF-67 with Ni2+ creates ZIF-67@NiCo-LDH, which is fully transferred into Co3O4@NiCo-LDH using a reflux process. Significant findingsOriginating from ZIF's porous and enormous surface area and unique dual-site configuration from Co3O4@NiCo-LDH/N-CNT led to the excellent electrocatalytic activity and durability, identical to an increase in the half-wave potential (E1/2=0.81 V) for ORR, exceeding the original N-CNTs performance (E1/2=0.75 V). Furthermore, this structural network as a bifunctional electrocatalyst for air electrodes exhibited a high specific capacity of 602 mAh/g with the stability of up to 55 h, proving its indispensable role Co3O4@NiCo-LDH/N-CNTs configuration.
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