File:Averaged performance metrics and correlations from the experimental campaign testing a solar hydrogen production system using a concentrated integrated photoelectrochemical device.webp

English: "a, Daily performance metrics—input/output energy during operation and efficiencies. For the system fuel efficiency (red) and IPEC device efficiency (blue), the solid and dotted lines denote enthalpy- and Gibbs free energy-based definitions, respectively. b, Device current vs voltage. c, Fuel power vs DNI. d, Heat power vs DNI. For b, c and d, the marker colour denotes the system outlet temperature, and the data have been filtered for steady state (as defined in Supplementary Fig. 10). Simulation results are shown as a dotted black line. For reference, a device current of 50 A corresponds to an EC current density of 1 A cm−2 and a PV current density of 8.4 A cm−2. Source data"