Cubic Prussian blue crystals from a facile one-step synthesis as positive electrode material for superior potassium-ion capacitors
作者： Lei Zhou , Mingyan Zhang , Yanfang Wang , Yusong Zhu , Lijun Fu
DOI: 10.1016/J.ELECTACTA.2017.02.096
关键词:
摘要: Abstract Cubic Prussian blue (PB) crystals are prepared by a facile one-step synsthesis. The structure and morphology of the as-prepared samples characterized X-ray power diffraction, inductively coupled plasma, scanning electron microscopy electrochemical measurement. PB electrode exhibits superior behavior in K 2 SO 4 aqueous solution including high reversible capacity (80 mAh g −1 at current density 0.5 A ), outstanding rate capability good cycling stability. K-ion capacitor (KIC) is also fabricated using as positive commercial activated carbon an negative electrode, it presents maximum energy 28 Wh kg 1 (corresponding to 7.5 mA cm −2 ). Furthermore, KIC excellent stability with retention nearly 98% over 1200 cycles. Our synthesized material provides new way for fabricating performance materials KIC.
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