A high-nucleus
silver nanopolycluster as a new type of silver-based
polymer supercapacitor (SSc) by a simple and single-step synthesis
process was designed and synthesized. The structural, optical, and
electrochemical properties of SSc-2 were determined. This highly stable
conductive 3D nanopolycluster shows great cycling stability, large
capacity, and high energy density without any modification or doping
process and so acts as an excellent SSc (412 F g–1 at 1.5 A g–1). In addition, there was a stable
cycling performance (94% capacitance) following 7000 cycles at 3 A
g–1 current density. The presence of fluorinated
groups, 3D expansion of high-nucleus metallic clusters, and porosity
are the advantages of SSc-2 that lead to stability, conductivity,
and high capacity, respectively. These results lead to the development
of a novel kind of SSc by overcoming the low conductivity and limited
capacity challenges without any modification.
The
current study aims to examine the charge storage mechanism
of an amine-decorated metal–organic framework (TMU-60), as
a supercapacitor electrode material, and explore the effect of proton
conductivity on the supercapacitive performance of this electrode.
To investigate the role of proton conductivity in charge storage capacity,
Na2SO4 was selected as the base electrolyte
at two pH levels (3 and 6). A high specific capacitance of 530 F·g–1 was achieved at 7 A·g–1 for
the aqueous electrolyte at pH = 3, while the specific capacitance
of the electrolyte decreased by 30% at pH = 6. The smaller sphere
radius of H+ than Na+ and its higher ionic mobility
in the narrow TMU-60 pores boosted charge transfer due to the higher
ion penetration into the electrolyte/electrode interface. Furthermore,
the presence of amines in proper orientation within the pores enhanced
ion transport and ion mobility. The results obtained from cyclic voltammetry
(CV) and electrochemical impedance spectroscopy for the electrodes
at both pH values revealed that increasing the pH level elevated charge-transfer
resistance. The constructed framework could tolerate high ranges of
scan rates (200–1000 mV·s–1), and its
semi-rectangular CV curves displayed a capacitance retention of 92.3%
after over 4000 cycles.
A novel 2D high nucleus silver nano-cluster was designed and synthesized by the combination of two synthesis methods (ultra-sonication and solvothermal) and was used as a supercapacitor electrode.
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