CoNi bimetallic engineering on porous carbon for high energy density hybrid supercapacitors
- Authors
- Pallavolu, Mohan Reddy; Sowjanya, V.; Dhananjaya, M.; Reddy, N. Ramesh; Jyothi, Nallapureddy; Jung, Jae Hak; Joo, Sang W.
- Issue Date
- Jun-2023
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Fryum-derived carbon; CoNi bimetallic; Supercapacitor; Energy density; Cyclic durability
- Citation
- JOURNAL OF ALLOYS AND COMPOUNDS, v.947
- Journal Title
- JOURNAL OF ALLOYS AND COMPOUNDS
- Volume
- 947
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/87674
- DOI
- 10.1016/j.jallcom.2023.169464
- ISSN
- 0925-8388
- Abstract
- Rationally designed, structurally stable, and high-capacity transition metal alloy decorated carbon composites have attracted considerable attention as electrode materials for high-performance hybrid super-capacitors (HSCs). A unique electrode material composed of mixed transition metals (Co and Ni) on fryums-derived porous carbon was synthesized using a facile one-step pyrolysis approach. The CoNi@C composite exhibited rich redox kinetics and good electrochemical performance in an aqueous alkaline electrolyte. In particular, the CoNi@C composite delivered a maximum specific capacity of 390 mA h g(-1) at 1 A g(-1) with good capacitance retention of 91 % over 5000 cycles. The gravimetric specific capacity of the CoNi@C composite was 1.3 times better than that of the single alloy composite. Moreover, the HSC fabricated with CoNi@C, and activated carbon electrodes exhibited a high energy density of 57.6 Wh kg(-1) at a power density of 742 W kg(-1) and good cycling stability with a low-capacity loss of 8 % after 5000 cycles. Utilizing high-voltage and energy density, the HSCs can power light-emitting diodes of different wavelengths, demonstrating its practical applicability in energy storage technologies. The structural verification of fryum-derived carbon revealed a good graphitization degree, ensuring its remarkable adaptability for device fabrication. (c) 2023 Elsevier B.V. All rights reserved.
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