Cubic Prussian blue crystals from a facile one-step synthesis as positive electrode material for superior potassium-ion capacitors

Lei Zhou, Mingyan Zhang, Yanfang Wang, Yusong Zhu, Lijun Fu, Xiang Liu, Yuping Wu, Wei Huang

Research output: Contribution to journalArticlepeer-review

118 Scopus citations

Abstract

Cubic Prussian blue (PB) crystals are prepared by a facile one-step synsthesis. The structure and morphology of the as-prepared samples are characterized by X-ray power diffraction, inductively coupled plasma, scanning electron microscopy and electrochemical measurement. The PB electrode exhibits superior electrochemical behavior in K2SO4 aqueous solution including high reversible capacity (80 mAh g−1 at the current density of 0.5 A g−1), outstanding rate capability and good cycling stability. The K-ion capacitor (KIC) is also fabricated by using PB as a positive electrode and commercial activated carbon as an negative electrode, and it presents a maximum energy density of 28 Wh kg−1 at the current density of 1 A g−1 (corresponding to 7.5 mA cm−2). Furthermore, the KIC also exhibits excellent cycling stability at the current density of 2 A g−1 with capacity retention of nearly 98% over 1200 cycles. Our synthesized electrode material provides a new way for fabricating high performance electrode materials for superior KIC.

Original languageEnglish
Pages (from-to)106-113
Number of pages8
JournalElectrochimica Acta
Volume232
DOIs
StatePublished - 1 Apr 2017

Keywords

  • K-ion capacitor
  • Prussian blue
  • activated carbon
  • electrochemical behavior
  • one-step synsthesis

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