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

摘要: Although rechargeable zinc-air batteries are one of the promising power sources, commercialization is hindered by a variety technical hurdles, especially low energy efficiency and poor rate capability due to discharge voltage. Herein, we report high-performance composite composed nanoporous NiO/Ni(OH)2 plates incorporated with carbon nanotubes. When used as active material, unlike any single types zinc-based batteries, electrochemical reactions in both nickel-zinc combined. A high voltage 1.7 V obtained battery region capacity over 800 mAh gZn−1 demonstrated region, attributed pseudocapacitance excellent activities electrical conductivity In addition, can be cycled steadily for 192 times at 5 mA cm−2 while maintaining higher than 60%. Moreover, profile obtainable remain unchanged even when charge current density increased 8 (from 2 16 cm−2), demonstrating high-rate capability. The results shed light on further explorations materials hybrid batteries.