Two-dimensional materials for intercalation/surface-enabled hybrid metal ion capacitors

Supervisory team: Dr Dawei Wang and Dr Kuang Hsu Wu

Description: Driven by the need to maintain the power capability as well as enhance the capacitance and energy density performance, hybrid electrochemical capacitors (HECs) with a different asymmetric configuration have been developed in recent years. HECs are generally composed of a battery-type Faradaic anode as energy source and a capacitor-type cathode as power source, which can enhance the cell voltage, further improving the energy and power capabilities. A particular example is lithium-ion capacitors (LICs), which combine Li-alloying anodes with supercapacitor cathodes. But LICs suffer from the high cost of lithium because of the scarcity in earth crust. Whereafter sodium-ion capacitors (SICs) emerge as an attractive alternative of Li-ion capacitors for the sake of the relative abundance of sodium. However, safety issue is a critical concern for either LICs or SICs because the metal anodes are extremely reactive and the organic solvents are flammable. Consequently, there is an urgent need to search for more favourable alternative metal-ion capacitor.

This project will devote to developing new generation aqueous metal-ion capacitor by deploying intercalation-based or surface-based fast Faradaic metal ion storage. These promising materials are mainly two-dimensional carbon or semiconductor materials, and their composites.

Suitable for: Chemical Engineers and Industrial Chemistry students. 

Level of difficulty: Challenging