Understanding supercapacitors based on nano-hybrid materials with interfacial conjugation

By G. Chen. 2013

280 citations recorded by the source corpus.

The recent fast development of supercapacitors, also known scientifically as electrochemical capacitors, has benefited significantly from synthesis, characterisations and electrochemistry of nanomaterials. Herein, the principle of supercapacitors is explained in terms of performance characteristics and charge storage mechanisms, i.e. double layer (or interfacial) capacitance and pseudo-capacitance. The semiconductor band model is applied to qualitatively account for the pseudo-capacitance in association with rectangular cyclic voltammograms (CVs) and linear galvanostatic charging and discharging plots (GCDs), aiming to differentiate supercapacitors from rechargeable batteries. The invalidity of using peak shaped CVs and non-linear GCDs for capacitance measurement is highlighted. A selective review is given to the nano-hybrid materials between carbon nanotubes and redox active materials such as electronically conducting polymers and transition metal oxides. A new concept, “interfacial conjugation”, is introduced to reflect the capacitance enhancement resulting from π–π stacking interactions at the interface between two materials with highly conjugated chemical bonds. The prospects of carbon nanotubes and graphenes for supercapacitor applications are briefly compared and discussed. Hopefully, this article can help readers to understand supercapacitors and nano-hybrid materials so that further developments in materials design and synthesis, and device engineering can be more efficient and objective.

Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Polymers and Plastics

View Paper: https://www.semanticscholar.org/paper/370342f3c37821510c6a2ab779ba8ab09017c51d

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Electrical and Electronic Engineering

1. Linpo Yu
2. L. Guan
3. G. Chen

In Electronic, Optical and Magnetic Materials

1. Linpo Yu
2. L. Guan
3. G. Chen
4. N. Azman
5. Yusran Sulaiman
6. L. H. Ngee

In Polymers and Plastics

1. Linpo Yu
2. G. Chen
3. L. Guan
4. N. Azman
5. Yusran Sulaiman
6. L. H. Ngee

Citations in the corpus

• Effect of doping on the performance of high-crystalline SrMnO3 perovskite nanofibers as a supercapacitor electrode (2018, background): “The near linear range in the triangular GCD curves indicates the electrochemical double-layer capacitance behavior, which may take place at the interface between electrode and electrolyte [55].”
• Capacitive and non-capacitive faradaic charge storage (2016, background): “2b where the voltage of the capacitor is plotted against the 14 plots in (b), tmax = UmaxC/I [4].”
• Supercapacitor and supercapattery as emerging electrochemical energy stores (2017, background): “2τ and 2t: end times of the second charging and discharging cycle, but not necessarily twice of τ and t [3,5,6].”
• Graphene‐based ternary composites for supercapacitors (2018, background): “However, the rectangular shape of CV curves can deviate due to the presence of Faradaic reaction (Figure 3B) that originated from the CPs and metal oxides.(15)”