Perylene diimide anchored graphene 3D structure via π-π interaction for enhanced photoelectrochemical degradation performances

Perylene diimide (PDI) anchored graphene three-dimensional (3D) structure was constructed via a simple electrodeposition-impregnation strategy. The photoelectrochemical catalysis removal rate is 8.2 or 4.5 times that of the only photo- or electro- catalysis. In dynamic degradation, the methylene blue removal ratio is 88.5 % for PDI/rGO catalyst, much higher than pure PDI (56.3 %). The stability is very high, and the activity did not decrease over 55 h. The enhanced photoelectrochemical degradation ability is mainly attributed to the pi-pi interaction between PDI and rGO. PDI nanorods as photocatalytic building blocks are anchored uniformly on the surface of 3D graphene via pi-pi stacking. The promoted separation and mobility of carriers are related to the extended electron delocalization along the pi-pi stacking direction. Besides, the 3D structure with a high BET area (176 m(2)/g) enables the adsorption-enrichment capability and possesses the advantage of separation free and high stability.