Vol 3: Ultrahigh capacitive performance from both CoOH2-graphene electrode and K3FeCN6 electrolyte.Report as inadecuate



 Vol 3: Ultrahigh capacitive performance from both CoOH2-graphene electrode and K3FeCN6 electrolyte.


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This article is from Scientific Reports, volume 3.AbstractPseudocapacitance is commonly associated to the reversible redox reactions from electrode materials, but the enhancement in pseudocapacitance that only relies on electrode materials is limited. Here, we explore the possibility of enhancing pseudocapacitance through both CoOH2-graphene nanosheets GNS electrode and K3FeCN6 electrolyte. With a good conductivity and favoring electron transfer, GNS are hybridized with CoOH2 to improve the pseudocapacitance of CoOH2, including enhancing its rate capability and electrochemical stability. Adding K3FeCN6 into KOH electrolyte further enhances the pseudocapacitance via both directly contributing pseudocapacitance to CoOH2-GNS and promoting the electron gain and loss of Co ions. This novel CoOH2-GNS-K3FeCN6-KOH electrode system shows an ultrahigh specific capacitance of 7514 Fg−1 at 16 Ag−1 in mixed 1 M KOH and 0.08 M K3FeCN6, more than 100% coulombic efficiency, and long-term cycling stability the capacitance retention is 75% after 20000 continuous charge-discharge cycles in mixed 1 M KOH and 0.04 M K3FeCN6.



Author: Zhao, Cuimei; Zheng, Weitao; Wang, Xin; Zhang, Hengbin; Cui, Xiaoqiang; Wang, Haoxiang

Source: https://archive.org/







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