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Raha, Himadri
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article
Ni<sub>6</sub>Se<sub>5</sub>, an unexplored transition metal chalcogenide of formula M<sub>(n+1)</sub>X <sub>n</sub> (2 ≤ n ≤ 8), for high-performance hybrid supercapacitor and Li-ion battery application
Abstract
<jats:title>Abstract</jats:title><jats:p>This work reports an <jats:italic>in situ</jats:italic>, one-step hydrothermal preparation procedure of a binder-free electrode growth of Ni<jats:sub>6</jats:sub>Se<jats:sub>5</jats:sub> on nickel foam (Ni<jats:sub>6</jats:sub>Se<jats:sub>5</jats:sub>/NF) with a rod-like structure. Ni<jats:sub>6</jats:sub>Se<jats:sub>5</jats:sub> is an enveloped transition metal chalcogenides of formula M<jats:sub>(<jats:italic>n</jats:italic>+1)</jats:sub>X<jats:italic><jats:sub>n</jats:sub></jats:italic> (where 2 ≤ <jats:italic>n</jats:italic> ≤ 8, M is a transition metal and X is chalcogen) of the nickel selenide family. The Ni<jats:sub>6</jats:sub>Se<jats:sub>5</jats:sub>/NF electrode described here demonstrates an exceptional lifetime of 81% capacitance retention over 20000 cycles and a high specific capacitance of 473.5 Fg<jats:sup>−1</jats:sup> at a current density of 4 Ag<jats:sup>−1</jats:sup>. The Ni<jats:sub>6</jats:sub>Se<jats:sub>5</jats:sub>/NF/activated carbon asymmetric supercapacitor (SC) exhibits a remarkable 97.3 Whkg<jats:sup>−1</jats:sup> energy density and a 2325 Wkg<jats:sup>−1</jats:sup> power density. Ni<jats:sub>6</jats:sub>Se<jats:sub>5</jats:sub> served as an active electrode material in SC applications and offered exceptional power density and long cycle life. Ni<jats:sub>6</jats:sub>Se<jats:sub>5</jats:sub>/NF, used as an anode for Li-ion batteries, has a lithium storage capacity of 939.7 mAhg<jats:sup>−1</jats:sup> at 100 mAg<jats:sup>−1</jats:sup> current density. Ni<jats:sub>6</jats:sub>Se<jats:sub>5</jats:sub>’s (active electrode material) excellent energy storage capability, which was previously unreported, is particularly beneficial for electrochemical energy storage device applications.</jats:p>