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Ma, Xiaoxia
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article
Modified KBBF-like Material for Energy Storage Applications
Abstract
Not only are new and novel materials sought for electrode material development, but safe and nontoxic materials are also highly being intensively investigated. Herein, we prepare ZnNiBO<sub>3</sub>(OH) (ZNBH), a modified and Be-free KBe<sub>2</sub>BO<sub>3</sub>F<sub>2</sub> (KBBF) family member as an effective electrode material. The novel ZNBH resembles the KBBF structure but with reinforced structure and bonding, in addition to well-incorporated conductive metals benefiting supercapacitor applications. The enhanced electronic properties of ZNBH are further studied by means of density functional theory calculations. The as-prepared ZNBH electrode material exhibits a specific capacity of 746 C g<sup>-1</sup> at a current density of 1 A g<sup>-1</sup>. A hybrid supercapacitor (HSC) device is fabricated and successfully illuminated multiple color LEDs. Interestingly, even after being subjected to long charge-discharge for 10 000 cycles, the ZNBH//AC HSC device retains 97.2% of its maximum capacity, indicating the practicality of ZNBH as an electrode material.