Journal
COMPOSITES PART B-ENGINEERING
Volume 245, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2022.110174
Keywords
Composite; Graphene oxide (GO); MOF; Supercapacitor; pH stable MOF
Funding
- CSIR, New Delhi, India [09/081(1330)/2019-EMR-I]
- SERB, New Delhi [CRG/2019/001034, EEQ/2020/000481]
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A highly capacitive two-dimensional nickel-metal organic framework was developed and combined with graphene oxide to create an effective supercapacitor device with high energy and power densities, and excellent cycle life retention.
Supercapacitors are projected as one of the most promising candidates for next-generation energy storage devices. Herein, we strategically developed a microporous two-dimensional Ni-metal organic framework (MOF: IITKGP-20A, IITKGP stands for the Indian Institute of Technology Kharagpur) which is highly scalable and thermodynamically stable over a wide pH range (2-10), intended for energy storage applications. Graphene oxide (GO) with different wt% (3, 5, and 7) was introduced with the MOF precursors to form in-situ MOF@GO composites (IITKGP-20A-GO3, IITKGP-20A-GO5, and IITKGP-20A-GO7 respectively), out of which IITKGP-20A-GO3 exhibits significantly high specific capacitance value (similar to 840 F g(-1) at 2 A g(-1)), which is one of the highest among the bare MOFs and their composites/derived materials. To verify its practical potentiality as positive electrode material, an asymmetric supercapacitor (ASC) device was fabricated displaying the specific capacitance of 111.4 F g(-1) at a current density of 2 A g(-1) while maintaining a high specific capacity of 65 F g(-1) even at a higher current density of 10 A g(-1). Moreover, the device produced 30.7 W h kg(-1) (0.031 W h cm(-3)) energy density with a very high power density of 388.5 W kg(-1) (0.394 W cm(-3)) with excellent retention of 84% cycle life up to 7000 cycles.
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