![]() In order to improve the voltage limits of current supercapacitors, we have incorporated Ketjen black (KB) as an electrode material. However, even state-of-the-art supercapacitors developed in laboratories are superior to or competitive with AECs only in low voltage applications (<∼40 V). Replacement of AECs with supercapacitors can lead to miniaturization of electronic devices. We believe that this demonstration of high-performance supercapacitors made from low-cost carbon materials is both scientifically interesting and important for practical applications.Ībstract = "Supercapacitors are generally more compact than conventional bulky aluminum electrolytic capacitors (AECs). On the other hand, KBs are much less expensive than carbon materials previously demonstrated for AC line filtering and hence are very attractive for practical applications. In addition, we demonstrate that an AC line filtering circuit with three supercapacitors connected in series can extend the application voltage without significant sacrifice in rate capability (ϕ ∼ −77° at 120 Hz). ![]() The KB supercapacitor exhibits excellent areal capacitance, cell voltage, and phase angle values of ∼574 μF cm −2, 2.8 V, and ∼−80°, respectively. Utilizing the open pore structure and the graphitic nature of KB, we demonstrate that the voltage limit can be extended to 53 V. ![]() Supercapacitors are generally more compact than conventional bulky aluminum electrolytic capacitors (AECs). ![]()
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