Fig. 2From: Photocatalytic Applications of Heterostructure Graphitic Carbon Nitride: Pollutant Degradation, Hydrogen Gas Production (water splitting), and CO2 ReductionThe systematic representation of the type II heterojunction semiconductor. Reproduced with permission [25]. Copyright 2015 WILEY-VCH Verlag GmbH & Co. KGaA, WeinheimBack to article page