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

Content Provider	Semantic Scholar
Author	Liu, Peitao Ran, Jiaqi Xia, Baorui Xi, Shibo Gao, Daqiang Wang, Jinsong
Copyright Year	2020
Abstract	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 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.
Starting Page	1
Ending Page	12
Page Count	12
File Format	PDF HTM / HTML
DOI	10.1007/s40820-020-0406-6
Alternate Webpage(s)	http://www.nmletters.org/images/pdf/v12/12_68_supporting_info.pdf
Alternate Webpage(s)	http://www.nmletters.org/images/pdf/v12/12_68.pdf
Alternate Webpage(s)	https://doi.org/10.1007/s40820-020-0406-6
Volume Number	12
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article