Abstract
Ni-Co binary hydroxide grown on nickel foam was synthesized through a facile one-step process for pseudocapacitive electrode application. The morphology of the fabricated binary hydroxide, evolving from nanosheet to nanowire, was highly controllable by tuning the Ni:Co ratio. In systematical electrochemical measurements, the prepared binary material on nickel foam could be employed as a binder-free working electrode directly. The optimal composition obtained at the Ni:Co ratio of 5:5 in integrated nanosheet/nanowire geometry exhibited high specific capacitances of 2807 and 2222 F/g at current densities of 1 and 20 A/g, equivalent to excellent rate capability. The capacitance loss was 19.8% after 2000 cycles, demonstrating good long-term cyclic stability. The outstanding supercapacitors behaviors benefited from unique structure and synergistic contributions, indicating the great potential of the obtained binary hydroxide electrode for high-performance energy storage devices.
Highlights
The enormously increasing energy requirements and the limited availability of energy sources motivate the development of efficient and safe energy storage devices [1,2]
We report a novel approach to directly grow Ni-Co binary hydroxides at different
By tailoring the cation ratio in preparation, the morphology of the binary system evolved from nanosheet to nanowire straightforwardly, as a consequence, giving rise to different supercapacitor behaviors
Summary
The enormously increasing energy requirements and the limited availability of energy sources motivate the development of efficient and safe energy storage devices [1,2]. Supercapacitors, as next-generation high-performance energy storage devices, significantly make up the shortfall of conventional physical capacitors and batteries, and are extremely suitable for superior power density and high charge/discharge rate required applications [3,4,5], such as electrical vehicles and stop-go driving models [6,7]. Supercapacitors possess an ultralong service life of up to. Two types of supercapacitors, divided by energy storage mechanisms, are termed as electric double-layer capacitors and pseudocapacitors, respectively [10,11]. The electric double-layer capacitors, by operating reversible ions’
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