Figure 1. Setups for the photocatalytic production of hydrogen by irradiation with sunlight, and with blue light from LED. The reaction mixture is stirred magnetically, and the evolving hydrogen is pneumatically collected in a flexible tube of silicone

From

Hydrogen Goes Green - Model Experiments for Artificial Photosynthesis

Richard Kremer, Michael W. Tausch

World Journal of Chemical Education. 2021, 9(4), 111-120 doi:10.12691/wjce-9-4-3