Abstract
HighlightsA facile and effective epitaxial-like growth strategy is applied to fabricate the NiSe2/Ni(OH)2 heterojunction composite.The assembled asymmetric supercapacitor based on the heterojunction composite surpasses most of the reported results. It is the first time that the powdered electrode materials can have such large capacity, high rate, and extreme long cycle life.
Highlights
Due to the severe consumption of fossil energy and envi‐ ronmental issues, it is urgent to develop novel clean-energy technologies, including solar, wind, and tide [1]
An asymmetric supercapacitor is composed of an electric double-layer capacitive (EDLC) electrode, enabling the fast energy delivery, and a pseudocapacitive/battery-type electrode, ensuring large energy stor‐ age [20,21,22]
The asymmetric supercapacitor composed of NiSe2/Ni(OH)2 cathode and p-phenylenediamine-functional reduced graphene oxide (PPD-rGO) anode exhibits ultrahigh specific capacity of 303 C g−1 and remarkable energy density of 76.1 Wh kg−1 at the power density of 906 W kg−1, as well as the excellent cycling stability of 82% capacity retention after 8000 cycles, demonstrating it a promising supercapacitor device
Summary
Due to the severe consumption of fossil energy and envi‐ ronmental issues, it is urgent to develop novel clean-energy technologies, including solar, wind, and tide [1]. Supercapacitors are attractive due to their high safety, long cycle lives, large power densities, and low cost [11,12,13] Their low energy densities, compared with other electrochemical energy technologies, limit their further applications [14,15,16]. N iSe2 sin‐ gle-crystal nano-octahedra can be obtained and are expected to perform good conductivity with high mechanical strength due to its single-crystal feature. The obtained NiSe2/Ni(OH) electrode material exhibits the following advantages: (1) the heterojunction can improve electron transfer by DFT calculations; (2) large specific surface areas and suitable microporous structure ensure the abundant elec‐ trochemical active sites which are accessed by the electrolyte and rapid ion migration within the electrode; (3) the highly crystallized NiSe2 nano-octahedra foundations provide high mechanical strength, the good cycling sta‐ bility was obtained. The asymmetric supercapacitor composed of NiSe2/Ni(OH) cathode and p-phenylenediamine-functional reduced graphene oxide (PPD-rGO) anode exhibits ultrahigh specific capacity of 303 C g−1 and remarkable energy density of 76.1 Wh kg−1 at the power density of 906 W kg−1, as well as the excellent cycling stability of 82% capacity retention after 8000 cycles, demonstrating it a promising supercapacitor device
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