Hybrid energy storage: high voltage aqueous supercapacitors based on activated carbon–phosphotungstate hybrid materials
By Jullieth Suárez-Guevara, V. Ruiz, P. Gómez‐Romero. 2014
143 citations recorded by the source corpus.
The use of hybrid electrodes prepared from phosphotungstic acid (H3PW12O40, PW12) and activated carbon (AC) allows the fabrication of highly durable aqueous supercapacitors operating at a superior voltage (1.6 V) thanks to the high overpotential of PW12 towards H2 generation. The combination of the double-layer capacitance plus the redox activity of the polyoxometalate clusters leads to an intrinsic increase in specific capacitance (from 185 F g−1 for AC to 254 F g−1 for AC–PW12) and a 60% increase in the operating voltage (compared to conventional AC supercapacitors with aqueous electrolytes, e.g. 1 M sulphuric acid). The hybrid energy storage mechanism and the increased operating voltage converge to yield improved specific energy and power. Moreover, the hybrid AC–PW12 electrode material showed an outstanding stability even after 30 000 cycles (0 to 1.6 V) with 98% retention of the initial capacitance, much superior to the stability of the parent supercapacitor based on plain AC under the same conditions.
Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/7f3cc74535245b168d5613347d4337d518fe51a5
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Citations in the corpus
- Polyoxometalate modified inorganic–organic nanocomposite materials for energy storage applications: A review (2015, methodology): “A number of reports describe the use of POMs to fabricate inorganic–organic composite electrodes for EC devices [14–25,33,46,60,78].”