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Title: Nanoporous NiO/Ni(OH)(2) plates incorporated with carbon nanotubes as active materials of rechargeable hybrid zinc batteries for improved energy efficiency and high-rate capability
Authors: Tan, P 
Chen, B 
Xu, HR 
Cai, WZ 
Liu, ML
Shao, ZP
Ni, M 
Issue Date: 2018
Publisher: Electrochemical Society
Source: Journal of the Electrochemical Society, 2018, v. 165, no. 10, p. A2119-A2126 How to cite?
Journal: Journal of the Electrochemical Society 
Abstract: Although rechargeable zinc-air batteries are one of the promising power sources, the commercialization is hindered by a variety of technical hurdles, especially the low energy efficiency and poor rate capability due to the low discharge voltage. Herein, we report a high-performance composite composed of nanoporous NiO/Ni(OH)(2) plates incorporated with carbon nanotubes. When used as the active material, unlike any single types of zinc-based batteries, the electrochemical reactions in both nickel-zinc and zinc-air batteries are combined. A high voltage of 1.7 V is obtained in the nickel-zinc battery region and a high capacity of over 800 mAh gZn(-1) is demonstrated in the zinc-air battery region, attributed to the high pseudocapacitance and excellent activities of NiO/Ni(OH)(2) nanoporous plates and the high electrical conductivity of carbon nanotubes. In addition, the battery can be cycled steadily for over 192 times at 5 mA cm(-2) while maintaining the capacity at the energy efficiency of higher than 60%. Moreover, the discharge voltage profile and obtainable capacity remain unchanged even when the charge current density is increased by 8 times (from 2 to 16 mA cm(-2)), demonstrating excellent high-rate charge capability. The results shed light on further explorations of active materials for high-performance rechargeable hybrid batteries.
ISSN: 0013-4651
EISSN: 1945-7111
DOI: 10.1149/2.0481810jes
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