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Electrolyzer current by power supply (initial experiment) and now provided by an efficient CPV in lab under 1 kW Xenon, daylight color (5600K) AM1(air mass) illumination. Left side is the 0.3074 cm2 Envoltek ESRD055 CPV situated under the air‐cooled AM1 filter. Middle top: the Fresnel concentrator above the AM1 filter. Middle bottom: the unattached CPV under the secondary optical concentrator. Right side: typical (550 sun) photocurrent–voltage plot of the CPV.
