MXene-based O/Se-rich bimetallic nanocomposites for high performance solid-state symmetric supercapacitors
- Authors
- Karkuzhali, Rajendran; Manoj, Shanmugasundaram; Shanmugapriya, Karnan; Narendra, Kumar Alam Venugopal; Gopu, Gopalakrishnan; Muniyappan, N.; Jeon, Byong-Hun; Muthu, SubbaiahMuthu
- Issue Date
- Feb-2022
- Publisher
- ACADEMIC PRESS INC ELSEVIER SCIENCE
- Keywords
- MXene; Bimetallic O; Se; Energy storage; Supercapacitor; Symmetric device
- Citation
- JOURNAL OF SOLID STATE CHEMISTRY, v.306, pp.1 - 11
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF SOLID STATE CHEMISTRY
- Volume
- 306
- Start Page
- 1
- End Page
- 11
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/139655
- DOI
- 10.1016/j.jssc.2021.122727
- ISSN
- 0022-4596
- Abstract
- Herein, we developed a novel and high-performance supercapacitor material for by incorporating an electron-rich oxalate-modified cobalt and nickel selenide (CoNi(Ox)Se) on the surface of MXene. The formation of O/Se-loaded CoNi on the MX, affording enhanced electron transport between the electrodes. A high pseudocapacitive charge storage behavior of the CoNi(Ox)Se@MX composite is confirmed, exhibiting a specific capacitance of 1782 F g−1at 5 mV s−1in a KOH (1 M) electrolyte solution. This capacitance value is considerably higher than that of Co-based electrodes reported in the literature. Furthermore, electrochemical cyclic measurements indicated that material stability is retained after 1000 cycles at 5 A g −1. Notably, when set up as a solid symmetric capacitor, the synthesized electrodes exhibit a high energy density of 131.9 Wh kg−1at a power density of 7.2 kW kg−1, along with flexibility. The material possesses an excellent capacitance retention (95%) after 5000 cycles without loss of any metals/Se. The results indicate that the MX-based composite promoted rapid electrolyte diffusion, fast kinetics in terms of electron-transport, and high charge/discharge rates. Thus, CoNi(Ox)Se@MX structures may have the potential for the development of novel energy storage systems suitable for portable, miniaturized, and wearable power devices.
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