Hybrid bimetallic phosphonates as cathode materials for miniaturized in-plane asymmetric supercapacitor device

Rupali Ipsita Mohanty, Ayan Mukherjee, Piyali Bhanja, Bikash Kumar Jena

Research output: Contribution to journalArticlepeer-review

Abstract

The utilization of wearable electronic devices facilitates the development of smart and flexible technology as a superior energy storage device that minimizes the dimension of wearable devices. The simple vacuum filtration method was employed to fabricate the micro-supercapacitor device (MSC) using the as-synthesized bimetallic nickel cobalt phosphonate (NiCoNPO) on the PVDF membrane as substrate. Novel microporous bimetallic metal phosphonates (NiCoNPO, Ni2CoNPO, NiCo2NPO) have been synthesized in a hydrothermal reaction condition by varying the molar ratio (Ni1:Co1; Ni2:Co1; Ni1:Co2) of metal sources without any employment of templating agent. Among these, NiCoNPO exhibits the remarkable specific capacitance of 2308 F g−1 at 1 mV s−1 and long-term cyclic stability up to the 5000th cycle with 99.6 % capacity retention in the three-electrode system. In addition, the electrode material demonstrates an exceptional capacitance of 574 F g−1 with stability (87.6 % retention) in a two-electrode system. Also, it displays excellent performance as a flexible MSC device with an areal capacitance of 123.5 mF cm−2. Notably, the MSC demonstrates long-term stability up to the 5000th cycle with a capacity retention of 85.6 %, suggesting the electrode material has excellent mechanical flexibility and superior electrochemical performance.

Original languageEnglish
Article number110313
JournalJournal of Energy Storage
Volume80
DOIs
StatePublished - 1 Mar 2024
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2023

Keywords

  • Asymmetric
  • Flexible
  • Micro-supercapacitor
  • Microporous
  • Nickel cobalt phosphonate

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