Solution-free self-assembled growth of ordered tricopper phosphide for efficient and stable hybrid supercapacitor

Nilesh R. Chodankar, Pragati A. Shinde, Swati J. Patil, Seung Kyu Hwang, Ganji Seeta Rama Raju, Kugalur Shanmugam Ranjith, Deepak P. Dubal, Yun Suk Huh, Young Kyu Han

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

Herein, a solution-free dry strategy for the growth of self-assembled ordered tricopper phosphide (Cu3P) nanorod arrays is developed and the product is employed as a high-energy, stable positive electrode for a solid-state hybrid supercapacitor (HSC). The ordered Cu3P nanorod arrays grown on the copper foam deliver an excellent specific capacity of 664 mA h/g with an energy efficiency of 88% at 6 A/g and an ultra-long cycling stability over 15,000 continuous charge–discharge cycles. These electrochemical features are attributed to the ordered growth of the Cu3P nanorod arrays, which offers a large number of accessible electroactive sites, a reduced number of ion transfer paths, and reversible redox activity. The potential of the Cu3P nanorod arrays is further explored by engineering solid-state HSCs in which the nanorods are paired with an activated carbon-based negative electrode. The constructed cell is shown to convey a specific energy of 76.85 Wh/kg at a specific power of 1,125 W/kg and an 88% capacitance retention over 15,000 cycles. Moreover, the superior energy storing and delivery capacity of the cell is demonstrated by an energy efficiency of around 65%. The versatile solution-free dry strategies developed here pave the way towards engineering a range of electrode materials for next-generation energy storage systems.

Original languageEnglish
Pages (from-to)194-202
Number of pages9
JournalEnergy Storage Materials
Volume39
DOIs
StatePublished - Aug 2021

Keywords

  • Dry electrode
  • Energy efficiency
  • Hybrid supercapacitor
  • Self-assembly
  • Solution free

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