Mixed-phase composites derived from cobalt terephthalate as efficient battery-type electrodes for high-performance supercapattery

Ramu Manikandan, Antonysamy Dennyson Savariraj, Goli Nagaraju, A. M. Kale, J. Puigdollers, Hyejin Park, Hyun Soo Kim, Jae Min Oh, C. Justin Raj, Byung Chul Kim

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Interfacial engineering of two-dimensional (2D) monometallic phosphides enables remarkable structural and electrochemical properties in energy storage devices. Herein, 2D nanosheets (NSs) of FeP2/Co2P were grown on Ni-foam (FCP) using a solution-based and phosphorization approach to be used as freestanding for high-performance energy storage devices. An effective phosphorization strategy is successfully developed to improve the overall crystalline phase, tailor the morphology, and boost the electrochemical performances of electrodes. The FCP NSs electrode exhibits a battery-type redox behavior with a maximum high areal capacity of 1.96 C cm–2 at 4 mA cm–2 in 6 M KOH aqueous electrolyte compared to the other counterparts. The superior electrochemical performance was achieved by increasing the electroactive sites and high conductivity via surface tailoring and fast redox reactions. Moreover, a supercapattery was assembled utilizing FCP and activated carbon (AC) electrodes and it revealed maximum specific energy (Es) and specific power (Ps) of 41.2 Wh kg–1 and 7578 W kg–1 with good cycling stability of 91% after 10,000 cycles at 5 A g–1. Eventually, the supercapattery has been explored in practical applications by lighting up light-emitting diodes (LEDs), representing the real-time performance of superior energy storage devices.

Original languageEnglish
Pages (from-to)220-233
Number of pages14
JournalJournal of Materials Science and Technology
Volume157
DOIs
StatePublished - 10 Sep 2023

Keywords

  • 2D nanosheet
  • Battery-type material
  • Energy storage
  • Monometallic phosphide
  • Supercapattery

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