Synthesis of nickel cobalt sulfide on Ni foam for improved electrochemical energy storage: Effect of binder-free reverse pulse potentiostatic electrodeposition and redox additive

N. C. Maile, S. K. Shinde, D. –Y Kim, K. C. Devarayapalli, Dae Sung Lee

Research output: Contribution to journalArticlepeer-review

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Abstract

Nickel cobalt sulfide (Ni-Co-S) was grown on 3D conductive Ni foam (NF) using binder-free electrochemical deposition to serve as a positive electrode (NCS@NF) for electrochemical energy storage application. Multiple cycles of reverse pulse potentiostatic electrochemical deposition (RPP-ED) were systematically applied to study their influence on the physico-chemical properties of NCS@NF. During the 300 optimized RPP-ED cycles uniform mesoporous interconnected nanoflakes of Ni-Co-S were formed on NF. The NCS@NF electrode demonstrated remarkable electrochemical storage performance, achieving a maximum areal capacity of 0.590 C cm−2 (590 C g−1) in 2 M KOH electrolyte. This remarkable property of NCS@NF can be associated with the improved ionic diffusion at the interconnected nanoflake structure and improved redox transitions at the active sites of nanoflakes. Moreover, the addition of K4(CN)6 as a redox additive improved the areal capacity of NCS@NF to 2.56 C cm−2 (2560 C g−1). Furthermore, an aqueous hybrid supercapacitor was assembled by integrating activated carbon on NF as the negative electrode, while employing NCS@NF as the positive electrode. The aqueous hybrid supercapacitor exhibited an enhanced charge-discharge potential of 1.5 V and demonstrated remarkable stability, maintaining 89% of its performance over 10,000 cycles. Notably, it achieved maximum energy and power densities, 33 μWh cm−2 and 6019 μW cm−2, respectively. These results establish its suitability for hybrid supercapacitor applications.

Original languageEnglish
Article number171845
JournalJournal of Alloys and Compounds
Volume967
DOIs
StatePublished - 10 Dec 2023

Keywords

  • Electrodeposition
  • Hybrid supercapacitor
  • Nickel cobalt sulfide
  • Redox additive
  • Reverse pulse electrodeposition

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