Metal-organic-framework-derived hierarchical Co/CoP-decorated nanoporous carbon polyhedra for robust high-energy storage hybrid supercapacitors

Vijayakumar Elayappan, Pragati A. Shinde, Ganesh Kumar Veerasubramani, Seong Chan Jun, Hyun Sung Noh, Kihyun Kim, Minkyung Kim, Haigun Lee

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Electrode materials exhibiting nanostructural design, high surface area, tunable pore size, and efficient ion diffusion/transportation are essential for achieving improved electrochemical performance. In this study, we successfully prepared cobalt phosphide and cobalt nanoparticles embedded into nitrogen-doped nanoporous carbon (CoP-CoNC/CC) using a simple precipitation method followed by pyrolysis-phosphatization. Subsequently, we employed CoP-CoNC/CC as the electrode for supercapacitor applications. Notably, the resultant CoP-CoNC/CC displayed a high surface area with tunable porosity. Based on the benefits of the CoP in CoNC/CC, improved electrochemical performance was achieved with a specific capacitance of 975 F g-1 at 1 mA cm-2 in a 2 M KOH electrolyte. The assembled hybrid supercapacitor using CoP-CoNC/CC (positive electrode) and activated carbon (AC) (negative electrode) exhibited a specific capacitance of 144 F g-1, a specific energy of 39.2 W h kg-1 at 1960 W kg-1 specific power, with better cyclic stability. The higher performance can be attributed to the synergetic effect between CoP, Co metal, and the nitrogen-doped nanoporous carbon in three-dimensional carbon cloth (CC). These excellent properties make CoP-CoNC/CC a promising electrode for developing future energy-storage devices.

Original languageEnglish
Pages (from-to)1157-1166
Number of pages10
JournalDalton Transactions
Volume49
Issue number4
DOIs
Publication statusPublished - 2020 Jan 1

ASJC Scopus subject areas

  • Inorganic Chemistry

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