J. Mater. Sci. Technol. ›› 2023, Vol. 157: 220-233.DOI: 10.1016/j.jmst.2023.02.019

• Research Article • Previous Articles     Next Articles

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

Ramu Manikandana, Antonysamy Dennyson Savarirajb, Goli Nagarajuc, A.M. Kaled, J. Puigdollerse, Hyejin Parkf, Hyun-Soo Kimf, Jae-Min Oha,*, C. Justin Rajg,*, Byung Chul Kimd,*   

  1. aDepartment of Energy and Materials Engineering, Dongguk University-Seoul, Seoul 04620, Republic of Korea;
    bAdvanced Functional Nanohybrid Material Laboratory, Department of Chemistry, Dongguk University Seoul-Campus, Jung-gu, Seoul, 04620, Republic of Korea;
    cDepartment of Materials, Imperial College London, London SW72AZ, United Kingdom;
    dDepartment of Advanced Components and Materials Engineering, Sunchon National University, 255, Jungang-ro, Suncheon-si, Jellanamdo, 57922, Republic of Korea;
    eDepartment of Enginyeria Electrònica, Universitat Politècnica Catalunya, Barcelona 08034, Spain;
    fNext Generation Battery Research Center, Korea Electrotechnology Research Institute (KERI), Changwon, 51543, Republic of Korea;
    gPhysics Division, School of Advanced Sciences, Vellore Institute of Technology (VIT), Chennai Campus, Chennai, 600127, Tamil Nadu, India
  • Received:2023-01-12 Revised:2023-02-21 Accepted:2023-02-21 Published:2023-09-10 Online:2023-09-07
  • Contact: *E-mail addresses: jmoh.nbml@gmail.com (J.-M. Oh), cjustinraj@gmail.com (C.J. Raj), bckim@scnu.ac.kr (B.C. Kim).

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 asnd 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.

Key words: 2D nanosheet, Monometallic phosphide, Battery-type material, Supercapattery, Energy storage