MXene-based O/Se-rich bimetallic nanocomposites for high performance solid-state symmetric supercapacitors

Rajendran Karkuzhali, Shanmugasundaram Manoj, Karnan Shanmugapriya, Alam Venugopal Narendra Kumar, Gopalakrishnan Gopu, N. Muniyappan, Byong Hun Jeon, Subbaiah Muthu Prabhu

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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.

Original languageEnglish
Article number122727
JournalJournal of Solid State Chemistry
StatePublished - Feb 2022
Externally publishedYes

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  • Bimetallic O/Se
  • Energy storage
  • MXene
  • Supercapacitor
  • Symmetric device


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