Construction of phosphatized cobalt nickel-LDH nanosheet arrays as binder-free electrode for high-performance battery-like supercapacitor device

Liang Xie, Shixia Chen, Yicheng Hu, Yeqian Lan, Xiang Li, Qiang Deng, Jun Wang, Zheling Zeng, Shuguang Deng

Research output: Contribution to journalArticlepeer-review

Abstract

Cobalt-nickel bimetallic phosphide intersectional nanosheet arrays are fabricated on carbon fiber cloth (CoNi-LDH-350P@CFC) via facile one-step hydrothermal synthesis of CoNi-LDH and a sequent phosphating at an optimal temperature (350 °C). Phosphating temperature is proven to be crucial in modulating the morphology and structure of phosphatized LDHs. The CoNi-LDH-350P@CFC nanosheet arrays not only provide sufficient redox-active sites but also boost the electrical conductivity and facilitate the ion and charge transport. Consequently, the CoNi-LDH-350P@CFC as a self-supported electrode could deliver an ultrahigh specific capacity of 803 C g−1 (or 223 mAh g−1) at a current density of 0.5 A g−1 and superior rate retention of 70% at a high rate of 30 A g−1. Furthermore, the assembled CoNi-LDH-350P@CFC//active carbon (AC) asymmetric supercapacitors (ASCs) can exhibit an impressive energy density of 42 Wh kg−1 at a power density of 400.4 W kg−1 with acceptable cycling stability of 87.7% capacitance retention after 3000 cycles at 10 A g−1.

Original languageEnglish (US)
Article number157652
JournalJournal of Alloys and Compounds
DOIs
StateAccepted/In press - 2020

Keywords

  • Asymmetric supercapacitor
  • Nanosheets
  • Self-supported
  • Transition metal phosphides (TMPs)

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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