Journal ArticleDOI
Ideally Pseudocapacitive Behavior of Amorphous Hydrous Cobalt-Nickel Oxide Prepared by Anodic Deposition
Chi-Chang Hu,Chen-Yi Cheng +1 more
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TLDR
In this article, a binary hydrous oxide with an amorphous structure (denoted as a-(Co + Ni)(OH) 2.nH 2 O) anodically deposited from a CoCl 2.6H 2O + NiCl 2.6H2O solution with its Co:Ni ratio of 4:6 and pH 8.0 exhibited a very large pseudocapacitance of ca. 730 F g -in 1 M NaOH.Abstract:
Binary hydrous cobalt-nickel oxide with an amorphous structure (denoted as a-(Co + Ni)(OH) 2 .nH 2 O) anodically deposited from a CoCl 2 .6H 2 O + NiCl 2 .6H 2 O solution with its Co:Ni ratio of 4:6 and pH 8.0 exhibited a very large pseudocapacitance of ca. 730 F g - in 1 M NaOH. The electrochemical reversibility of this material was examined at various charging-discharging currents in 1 M NaOH with different temperatures. This binary hydrous oxide exhibiting ideally pseudocapacitive behavior (i.e., high reversibility, high specific capacitance, and high power property) has been demonstrated to be a potential candidate for the application of electrochemical supercapacitors. The morphology and rough nature of this deposit were demonstrated through means of atomic force microscopy.read more
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A Cost-Effective Supercapacitor Material of Ultrahigh Specific Capacitances: Spinel Nickel Cobaltite Aerogels from an Epoxide-Driven Sol–Gel Process
TL;DR: This work reported the first successful preparation of nickel cobaltite aerogels with the epoxide-driven sol–gel process, which showed an extremely high-specific capacitance of 1400 F g under a mass loading of 0.4 mg cm 2 at a sweep rate of 25mV s.
Journal ArticleDOI
Metal oxide thin film based supercapacitors
TL;DR: In this paper, the performance data of metal oxide thin-film electrodes have been presented, and the supercapacitors exhibited the specific capacitance values between 50 and 1100 F g-1, which are quite comparable with bulk electrode values.
Journal ArticleDOI
How to Achieve Maximum Utilization of Hydrous Ruthenium Oxide for Supercapacitors
TL;DR: In this paper, a composite consisting of activated carbon (AC) and RuO x.nH 2 O coated on graphite (denoted as AC-RuO x /G) was obtained from high-resolution transmission electron microscopy.
Journal ArticleDOI
Facile approach to prepare nickel cobaltite nanowire materials for supercapacitors
TL;DR: Nickel cobalt nanowire is prepared by hydrothermal and thermal decomposition processes, with mesoporous characteristics and nanocrystal structure that results from the coexistence of nickel and cobalt ions.
Journal ArticleDOI
Enhancing electrochemical reaction sites in nickel-cobalt layered double hydroxides on zinc tin oxide nanowires: a hybrid material for an asymmetric supercapacitor device.
TL;DR: The facile synthesis of nickel cobalt layered double hydroxides (LDHs) on conducting Zn(2)SnO(4) (ZTO) and the application of this material to a supercapacitor is reported and the first report of an enhancement of the active faradic reaction sites (electroactive sites) resulting from the heterostructure is presented.
References
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Book
Atlas of Electrochemical Equilibria in Aqueous Solutions
TL;DR: The Atlas of Electrochemical Equilibria in Aqueous solutions as discussed by the authors is the most complete and complete work on aqueous solvents, which includes a detailed description of the properties of the solvers.
Journal ArticleDOI
Supercapacitor Behavior with KCl Electrolyte
Hee Y. Lee,John B. Goodenough +1 more
TL;DR: Amorphous MnO2·nH2O in a mild 2 M KCl aqueous electrolyte proves to be an excellent electrode for a faradaic electrochemical capacitor cycled between −0.2 and +1.0 V versus SCE.
Journal ArticleDOI
Characterization of Sol‐Gel‐Derived Cobalt Oxide Xerogels as Electrochemical Capacitors
TL;DR: Very fine cobalt oxide xerogel powders were prepared using a unique solution chemistry associated with the sol-gel process as mentioned in this paper, and the effect of thermal treatment on the surrace area, pore volume, crystallinity, particle structure, and corresponding electrochemical properties was investigated and found to have significant effects on all of these properties.
Journal ArticleDOI
An Electrochemical Route for Making Porous Nickel Oxide Electrochemical Capacitors
TL;DR: In this paper, the authors demonstrate the versatility of fabricating a wide range of porous metal oxide films using this electrochemical route for use in capacitor applications, including porous cobalt oxide films.
Journal ArticleDOI
The Limitations of Energy Density for Electrochemical Capacitors
Jim P. Zheng,J. Huang,T.R. Jow +2 more
TL;DR: In this paper, a formula describing the dependence of energy density on specific capacitance, operating voltage, and salt concentration is given based on the optimized weight (or volume) ratio of the electrode material and the electrolyte.