Fig. 3From: Photocatalytic Applications of Heterostructure Graphitic Carbon Nitride: Pollutant Degradation, Hydrogen Gas Production (water splitting), and CO2 ReductionThe roadmap of the evolution of z-scheme photocatalytic system. Reproduced with permission from [3] with slight modifications. Copyright 2017 WILEY-VCH Verlag GmbH & Co. KGaA, WeinheimBack to article page