Are there some materials that can not work in the symmetric supercapacitors device and should therefore be coupled with another electrode to work as Asymmetric supercapacitors? and why ?
Supercapacitors can be classified into three different types: EDLCs, pseudocapacitors, and asymmetric supercapacitors. Asymmetric supercapacitors are classified into two types: systems with two capacitive electrodes or hybrid capacitors. The Hybrid capacitors have come to be identified as devices in which one electrode stores charge by faradaic process ( battery-type) while the other electrode stores charge based on a capacitive mechanism.
However, asymmetric supercapacitors can take full advantage of the different potential windows of the two electrodes to maximize the operating voltage of the full device. For instance, while the voltage of an aqueous- based symmetric system is limited to ∼1.2 V, the operating voltage of an asymmetric supercapacitor can be extended beyond 2.0 V. Thereby, increasing the energy density (Ed = 0.5 *C* V^2).
** Design and Mechanisms of Asymmetric Supercapacitors; Chem. Rev. 2018, 118, 9233−9280.
Supercapacitors can be classified into three different types: EDLCs, pseudocapacitors, and asymmetric supercapacitors. Asymmetric supercapacitors are classified into two types: systems with two capacitive electrodes or hybrid capacitors. The Hybrid capacitors have come to be identified as devices in which one electrode stores charge by faradaic process ( battery-type) while the other electrode stores charge based on a capacitive mechanism.
However, asymmetric supercapacitors can take full advantage of the different potential windows of the two electrodes to maximize the operating voltage of the full device. For instance, while the voltage of an aqueous- based symmetric system is limited to ∼1.2 V, the operating voltage of an asymmetric supercapacitor can be extended beyond 2.0 V. Thereby, increasing the energy density (Ed = 0.5 *C* V^2).
** Design and Mechanisms of Asymmetric Supercapacitors; Chem. Rev. 2018, 118, 9233−9280.
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