@article { ISI:000227046400028, title = {Preparation and characterization of composite electrodes of coconut-shell-based activated carbon and hydrous ruthenium oxide for supercapacitors}, journal = {Journal of Power Sources}, volume = {141}, number = {1}, year = {2005}, month = {FEB}, pages = {198-203}, publisher = {ELSEVIER SCIENCE BV}, type = {Article}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

The relationship between the structure-specific capacitance (F g(-1)) of a composite electrode consisting of activated coconut-shell carbon and hydrous ruthenium oxide (RuOx(OH)(y)) has been evaluated by impregnating various amounts of RuOx(OH)(y) into activated carbon that is specially prepared with optimum pore-size distribution. The composite electrode shows an enhanced specific capacitance of 250 F g(-1) in 1 M H2SO4 with 9 wt.\% ruthenium incorporated. Chemical and structural characterization of the composites reveals a homogeneous distribution of amorphous RuOx(OH)(y) throughout the porous network of the activated carbon. Electrochemical characterization indicates an almost linear dependence of capacitance on the amount of ruthenium owing to its pseudocapacitive nature. (C) 2004 Elsevier B.V. All rights reserved.

}, keywords = {activated carbon, Composite, Electrochemical characterization, pseudocapacitance, specific capacitance, supercapacitor}, issn = {0378-7753}, doi = {10.1016/j.powsour.2004.09.008}, author = {Dandekar, M. S. and Arabale, G. and Vijayamohanan, K.} } @article {48413, title = {Ultrahigh capacitance of NiCo2O4/CeO2 mixed metal oxide material for supercapacitor applications}, journal = {Journal of Alloys and Compounds}, volume = {899}, year = {2022}, month = {APR}, pages = {163312}, type = {Article}, abstract = {

Pertaining to research on energy consumption and energy storage systems, new and efficient mixed metal oxides of NiCo2O4/CeO2 as pseudo-capacitor materials have been successfully prepared by sol-gel combustion method. The synthesized unique spinel nanomaterials have been analyzed for structural and morphological characterization by FT-IR, XRD, XPS and electron microscopy techniques. The mesoporous structure and large specific surface area of the synthesized nanomaterials provide an easy channel for ion mobility rendering an effortless redox process at the electrode electrolyte interface. As a consequence, it is observed that NiCo2O4 mixed with 10\% of CeO2 exhibits an excellent specific capacitance of 1355 Fg(-1) at 5 Ag-1 along with a high cycling stability with only 4.7\% capacity loss at the end of 6000 cycles at a charge-discharge current density of 10 Ag-1. The results obtained are in par with some of the recent electrode materials used for supercapacitors suggesting the possible employment of NiCo2O4/CeO2 mixed metal oxides in energy storage applications. (C) 2021 Elsevier B.V. All rights reserved.

}, keywords = {Charge-discharge, cyclic voltammetry, NiCo2O4/CeO2, specific capacitance, supercapacitor}, issn = {0925-8388}, doi = {10.1016/j.jallcom.2021.163312}, author = {Santhosh, G. and Nayaka, G. P. and Bhatt, Aarti S.} } @article {48988, title = {Evaluation of Fe3O4 incorporated functionalized carbon nanotube self-standing buckypaper as electrodes for solid-state symmetric supercapacitor}, journal = {Journal of Energy Storage }, volume = {73}, year = {2023}, month = {DEC }, pages = {109-101}, type = {Article}, abstract = {

Iron (II, III) oxide and carbonaceous materials drawn considerable attention in energy storage owing to their special features. In this study, simple reverse co-precipitation, acid functionalization and vacuum filtration methods adopted to synthesis Fe3O4 nanoparticles of size 11 nm and -COOH acid functionalized multi-wall carbon nanotubes (FMWCNT). And further used them to prepare and optimize Fe3O4 in FMWCNT as 15 wt\% and 25 wt\% self-standing buckypapers of around 30-mu m thickness as electrodes for solid-state symmetric capacitor in the form of coin cell. The results show that 15 wt\% and 25 wt\% of Fe3O4-FMWCNT buckypapers hybrid nanostructures have Fe3O4 nanoparticles successfully incorporated in FMWCNT. The 25 wt\% Fe3O4-FMWCNT electrodes with charge transfer resistance of 140 Ohm showed high areal specific capacitance (Cs) 78.5 mF/cm2 and retained 80 \% of its Cs until 800 cycles even at high current density of 1 mA/cm2, scan rate of 100 mV/s whereas 15 wt\% Fe3O4-FMWCNT showed low Cs of 47 mF/cm2 and retained 80 \% of its Cs over 5000 cycles whereas only FMWCNT show Cs is 36 mF/cm2 with 54 Ohm. Finally, a solid-state symmetric supercapacitor coin cell with self-standing 25 wt\% Fe3O4-FMWCNT buckypaper showed an excellent power density of 129.5 mW cm-3 and energy density of 3.6 mWh cm-3 is the innovation of the current work. This is mainly attributed to the combined effect of pseudocapacitive behavior from Fe3O4 by faradaic reaction with additional charge transfer resistance and electric double layer (EDLC) behavior from FMWCNTs by non-faradaic of electronic, ionic transport during charging-discharging. As-made solid-state symmetric supercapacitor appears as a high-performance storage device without extra support of current collectors for practical applications and for fabri-cation of planar capacitors.

}, keywords = {Buckypaper, Power density, specific capacitance, Symmetric supercapacitor}, issn = {2352-152X}, doi = {10.1016/j.est.2023.109101}, author = {Bhaviripudi, Vijayabhaskara Rao and Dwivedi, Pravin K. and Pabba, Durga Prasad and Aepuru, Radhamanohar and Nakate, Umesh T. and Espinoza-Gonzalez, Rodrigo and Shelke, V, Manjusha} }