We demonstrate the possibility of direct power generation from waste coffee grounds (WCG) via hightemperature
carbon fuel cell technology. At 900 C, the WCG-powered fuel cell exhibits a maximum
power density that is twice than carbon black. Our results suggest that the heteroatoms and hydrogen
contained in WCG are crucial in providing good cell performance due to its in-situ gasification, without
any need for pre-reforming. As a first report on the use of coffee as a carbon-neutral fuel, this study
shows the potential of waste biomass (e.g. WCG) in sustainable electricity generation in fuel cells.