Citation: CHEN Kunfeng, XUE Dongfeng. Evaluation of Specific Capacitance of Colloidal Ionic Supercapacitor Systems[J]. Chinese Journal of Applied Chemistry, ;2016, 33(1): 18-24. doi: 10.11944/j.issn.1000-0518.2016.01.150308 shu

Evaluation of Specific Capacitance of Colloidal Ionic Supercapacitor Systems

CHEN Kunfeng ,
XUE Dongfeng ^,

1.
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China

Corresponding author: XUE Dongfeng,
Received Date: 25 August 2015
Available Online: 16 November 2015
Fund Project:

Although they show high power density, supercapacitors often suffer from low energy density. As a new kind of supercapacitors, colloidal ion supercapacitors that include various transition metal cations and rare earth cations, such as Mn²⁺, Fe²⁺, Co²⁺, Ni²⁺, Cu²⁺, Sn²⁺, Sn⁴⁺, La³⁺, Ce³⁺, Er³⁺, Yb³⁺, etc, show both high energy density and high power density. Proper evaluation of specific capacitance of colloidal ion supercapacitors can deepen our understanding of the electrochemical mechanism of electroactive cations in pseudocapacitive electrode materials. This review firstly outlines the basic concept of colloidal ion supercapacitors and in situ coprecipitation synthesis methods. Then the specific capacitance based on active cations(named cationic capacitance) is used to evaluate the performance of colloidal ion supercapacitors. We then calculate the specific capacitances on the basis of hydroxides and oxides(named hydroxide capacitance and oxide capacitance), which are traditional evaluation methods for supercapacitors. Compared with three kinds of specific capacitances, cationic capacitance can really reflect the intrinsic reaction mechanism of pseudocapacitive materials. It is expected that colloidal ion supercapacitors can overcome the technical bottleneck of the existing electrochemical energy storage devices and be the next-generation high-energy storage devices.
- capacitance evaluation,
- colloid ionic supercapacitor,
- pseudocapacitance,
- Faradic reaction
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