Fig. 8.
a Typical H2 and O2 production from water under visible-light irradiation. b Wavelength-dependent QE (red dots) of water splitting by composite catalyst. c QE for different concentrations of carbon dots/g-C3N4 catalysts in a fixed mass of composite catalyst. d QE for different catalyst loads with a constant carbon dot concentration in 150 ml of ultra-pure water. Reproduced with permission from Ref. [95]. Copyright 2015 American Association for the Advancement of Science. (Color figure online)