Nano-Micro Letters

Bifunctional Oxygen Electrocatalyst of Mesoporous Ni/NiO Nanosheets for Flexible Rechargeable Zn–air Batteries

Peitao Liu1, Jiaqi Ran1, Baorui Xia1, Shibo Xi2, Daqiang Gao1, *, John Wang3

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Nano-Micro Lett. (2020) 12: 68

First Online: 09 March 2020 (Article)

DOI:10.1007/s40820-020-0406-6

*Corresponding author. E-mail: gaodq@lzu.edu.cn (D. Q. Gao)

 

Abstract

 


Toc

One approach to accelerate the stagnant kinetics of both the oxygen reduction and evolution reactions (ORR/OER) is to develop a rationally designed multiphase nanocomposite, where the functions arising from each of the constituent phases, their interfaces, and the overall structure are properly controlled. Herein, we successfully synthesized an oxygen electrocatalyst consisting of Ni nanoparticles purposely interpenetrated into mesoporous NiO nanosheets (porous Ni/NiO). Benefiting from the contributions of the Ni and NiO phases, the well-established pore channels for charge transport at the interface between the phases, and the enhanced conductivity due to oxygen-deficiency at the pore-edges, the porous Ni/NiO nanosheets show a potential of 1.49 V (10 mA cm-2) for the OER and a half-wave potential of 0.76 V for the ORR, outperforming their noble-metal counterparts. More significantly, a Zn–air battery employing the porous Ni/NiO nanosheets exhibit an initial charge-discharging voltage gap of 0.83 V (2 mA cm-2), specific capacity of 853 mAh gZn-1 at 20 mA cm-2, and long-time cycling stability (120 h). In addition, the porous Ni/NiO-based solid-like Zn–air battery shows excellent electrochemical performance and flexibility, illustrating its great potential as a next-generation rechargeable power source for flexible electronics.


 

Keywords

Porous Ni/NiO; Oxygen reduction reaction; Oxygen evolution reaction; Electrocatalysis; Flexible Zn–air battery

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