Facile ultrasonication synthesis of MXene/HKUST-1 composite as positive electrode for supercapattery

Supercapattery is an energy storage device that can overcome the sustainable energy and environmental crisis with the advantage of enhanced specific power and specific energy. A facile ultrasonication method was used to synthesise a composite of MXene and HKUST-1 (MXene/HKUST-1). MXene/HKUST-1 composite was studied for its morphology, phase, vibration mode, functional groups, chemical composition and surface area that contributed to the electrochemical performance. Pairing MXene/HKUST-1 as a positive electrode with activated carbon (AC) as a negative electrode in a supercapattery device achieved Cs of 19 C g−1 and a specific energy of 4.0 Wh kg−1. The specific power of the device was 348 W kg−1 and the stability was 65% after 10,000 cycles. The highly conductive MXene, large surface area and porosity of HKUST-1 create a remarkable performance of the supercapattery device by mitigating the self-restacking problem in MXene and low conductivity of HKUST-1.

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