Publication date: 10th October 2023
Sunlight-driven water splitting systems that are highly efficient, scalable, and cost-competitive show promise for practical solar hydrogen fuel production. The Z-scheme water splitting system, consisting of a hydrogen evolution photocatalyst (HEP) and an oxygen evolution photocatalyst (OEP), is particularly promising for hydrogen production due to the smaller band structure limitations of each photocatalyst compared to single photocatalyst systems. The key challenge in developing an effective Z-scheme system lies in ensuring efficient electron transfer between HEP and OEP[1].
Photocatalyst sheets comprising HEP and OEP particles and a continuous conductive layer, such as Au[2] and sputtered carbon[3], facilitated efficient and scalable photocatalytic Z-scheme water splitting due to the promoted interparticle electron transfer. However, the use of vacuum processes in preparing these sheets raises the device cost. Hence, it is crucial to explore a more cost-effective electron mediator and incorporate it into the photocatalyst sheet using a more accessible approach.
In this work, we introduce photocatalyst sheets based on Rh-doped SrTiO3 (SrTiO3:Rh) and Mo-doped BiVO4 (BiVO4:Mo) integrated with reduced graphene oxide (rGO) serving as an electron mediator. These sheets were prepared using a vacuum-free and easily accessible drop-casting method. Scanning electron microscope images demonstrated that rGO bridged SrTiO3:Rh and BiVO4:Mo, indicating the potential for efficient electron transfer between the two species. This sheet exhibited water-splitting activity 15 times and 10 times higher than that of the powder suspension system and the sheet without rGO, respectively.
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