Assessing the Feasibility of Implementing Porous Carbon Foam Electrodes Derived from Coal in Redox Flow Batteries

Abstract

The feasibility of carbon foam electrodes derived from coal for the vanadium redox flow battery (VFB) is assessed as a pathway to repurpose mining waste for use in renewable energy storage technologies. Three-electrode, half-cell, and full-cell measurements provide proof-of-concept for coal foam as an electrode material for VFBs. Similarities in physical and chemical properties between the coal foam used here and other VFB electrode materials is characterised via SEM, micro-CT, XPS, MRI, and Raman spectroscopy. We show that significant improvement in electrochemical performance of the coal foam electrodes can be achieved via simple techniques to improve material wetting and remove impurities. The overall characteristics and electrochemical behaviour indicate that coal-derived foam can be feasibly utilised as an electrode material, and with further electrode activation, may provide a competitive solution to both cost-efficient VFBs and waste reduction.