Hydrogen and Electricity from Carbon in a Coupled Steam-Carbon-Air Fuel Cell

Abstract

A novel hybrid electrochemical conversion scheme for the spontaneous and simultaneous production of carbon-free hydrogen and electric power is proposed and modeled. The design combines a carbon fuel cell and a steam-carbon fuel cell into a steam-carbon-air fuel cell that shares a single solid carbonaceous fuel bed in the anode chamber. A model of the combined cell is developed and a new definition for overall cell efficiency, which accounts for the hydrogen product generated, is produced. Results indicate that the proposed cell can reach efficiencies above 76%, and can also realize a nine-fold increase in hydrogen production rate density compared to a steam-carbon fuel cell with only a doubling of the cell active area.