Fig. 5: Performance of two-electrode system.
From: Acidic enol electrooxidation-coupled hydrogen production with ampere-level current density

a Physical picture of flow cell. b Schematic diagram of the internal structure of flow cell. c Polarization curves for flow cell at 25 and 60 °C in 1 M AA solution. d Faraday rate of hydrogen production with 1 M AA solution. e A comparison of electricity expense for hydrogen production with water electrooxidation49,50,51,52 and biomass electrooxidation53,54,55,56 systems. Orange, green and blue regions represent electrooxidation for biomass, water and AA.