Skip to main content
Upcoming Events:

Matls 701/702: Ryan Poon, PhD Candidate

Date & Time:
   Add All to Calendar
Location:

JHE A102

Event Contact:

materials@mcmaster.ca

Fabrication of Advanced Electrode Materials for Electrochemical Supercapacitor Applications

Overview

Electrochemical supercapacitors are emerging energy storage devices for automotive and electronic applications which offer high power density and long cyclic life. Manganese dioxide (MnO2) is a promising candidate as electrode material due to its high theoretical capacitance and low cost. However, the low conductivity and high susceptibility to agglomeration of MnO2 have significantly reduced the capacitance especially at high active mass loadings. For practical applications, it is important to have a high active materials mass to current collector mass ratio for the fabrication of high performance lightweight devices.

In this presentation, the application of conceptually new colloidal processing techniques and advanced dispersants will be discussed. A precursor transfer by complex formation based on liquid-liquid extraction was developed for the fabrication of MnO2 – multiwalled carbon nanotubes (MWCNTs) nanocomposites, which resulted in high areal capacitances. MnO2-MWCNTs composites were also fabricated using a highly concentrated NaMnO4 precursor, and allowed for reduced agglomeration and enhanced mixing of MnO2 with MWCNTs. Charged aromatic dyes were used to fabricate nanocomposite by an electrostatic heterocoagulation, containing  manganese (II,III) oxide (Mn3O4) and MWCNTs. The Mn3O4-MWCNTs composite electrode showed good performance at high active mass loading after the activation procedure.

https://www.eng.mcmaster.ca/sites/default/files/ryan_poon.pdf