Facile synthesis of copper hexacyanoferrate/graphene nanocomposite for electrochemical energy storage

Ehsan Targholi | Mohammad Safi Rahmanifar | S. Morteza Mousavi-Khoshdel

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URL :   http://research.shahed.ac.ir/WSR/WebPages/Report/PaperView.aspx?PaperID=85707
Date :  2018/10/18
Publish in :    Applied Organometallic Chemistry
DOI :  https://doi.org/10.1002/aoc.4615
Link :  https://onlinelibrary.wiley.com/doi/10.1002/aoc.4615
Keywords :copper hexacyanoferrate, graphene, nanocomposite, supercapacitors

Abstract :

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A two‐component nanocomposite of copper hexacyanoferrate/reduced graphene oxide (CuHCF/rGO) was successfully synthesized using a solutionbased co‐precipitation process in the presence of graphene oxide solution. Electrochemical measurements indicated a specific capacitance of 548 F g−1 at a current density of 0.5 A g−1 in the potential range of −0.2 to 1 V, versus Ag/ AgCl standard electrode, obtained in an electrolyte of 0.5 M K2SO4 (as a neutral electrolyte) during galvanostatic charge/discharge cycles. This value is higher than the specific capacitance of the raw materials rGO (174 F g−1 at a current density of 0.5 A g−1) and CuHCF (236 F g−1 at a current density of 0.5 A g−1), which is rooted in the activation of copper ions in the electrochemical reaction and some synergistic effects (observed between rGO and CuHCF). The rGO/ CuHCF nanocomposite electrode was able to retain 83 of its initial capacitance after 1000 cycles at a current density of 3 A g−1