纳微快报（英文）2020，Vol.12Issue(5)：165-176,12.
Bifunctional Oxygen Electrocatalyst of Mesoporous Ni/NiO Nanosheets for Flexible Rechargeable Zn–Air Batteries
摘要
Abstract
One approach to accelerate the stagnant kinetics of both the oxygen reduction and evolution reactions (ORR/OER) is to develop a ration-ally 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 electrocat-alyst 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 exhibits an initial charging–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.关键词
Porous Ni/NiO/Oxygen reduction reaction/Oxygen evolution reaction/Electrocatalysis/Flexible Zn–air batteryKey words
Porous Ni/NiO/Oxygen reduction reaction/Oxygen evolution reaction/Electrocatalysis/Flexible Zn–air battery引用本文复制引用
Peitao Liu,Jiaqi Ran,Baorui Xia,Shibo Xi,Daqiang Gao,John Wang..Bifunctional Oxygen Electrocatalyst of Mesoporous Ni/NiO Nanosheets for Flexible Rechargeable Zn–Air Batteries[J].纳微快报（英文）,2020,12(5):165-176,12.基金项目
This work is supported by the National Natu-ral Science Foundation of China (Grant Nos. 11474137, 11674143) and the Fundamental Research Funds for the Central Universities (Grant No. Lzujbky-2019-cd02). John Wang and team thank for the support of MOE (MOE2016-T2-2-138) for research conducted at the National University of Singapore. （Grant Nos. 11474137, 11674143）
