Extended Data Fig. 5: Long-term records of the field test of the 100-m2 photocatalyst panel reactor at Kakioka Research Facility from 22 September to 21 December 2020.
From: Photocatalytic solar hydrogen production from water on a 100-m2 scale
a–f, Solar radiation (a), ultraviolet power (b), oxyhydrogen gas production rate (c), ambient temperature (d), daily STH value (e) and proportion of ultraviolet energy (f). The oxyhydrogen gas was not produced in late December 2020, because of the cold weather freezing the panel reactor units and other equipment. On 2, 6 and 30 October, the gas was directed to the gas separation equipment, without delivery to the gas flowmeter. On 9 and 10 October, the daily STH values were abnormally high. These values are not reliable because of bad weather and the low solar radiation. On 9 and 10 October, the daily STH values were abnormally high. These values are not reliable because of bad weather and the low solar radiation. The data on 18 November and 8 December were not reliable either, owing to malfunction of the soap-film flowmeter.
