Details

Autor(en) / Beteiligte

• Wang, Qian
• Li, Yanbo
• Hisatomi, Takashi
• Nakabayashi, Mamiko
• Shibata, Naoya
• Kubota, Jun
• Domen, Kazunari

Titel

Z-scheme water splitting using particulate semiconductors immobilized onto metal layers for efficient electron relay

Ist Teil von

• Journal of catalysis, 2015-08, Vol.328, p.308-315

Ort / Verlag

San Diego: Elsevier Inc

Erscheinungsjahr

2015

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• [Display omitted] •HEP/M/OEP devices show high photocatalytic activity for overall water splitting.•Metal layers transfer photogenerated carriers in an effective manner.•HEP/M/OEP systems operate efficiently in neutral solutions without redox couples.•The choice of materials is not limited by the signs of surface charges.•HEP/M/OEP devices allow to overcome the limitations of earlier Z-scheme systems. A major challenge in developing high-performing Z-scheme water splitting systems lies in achieving efficient transfer of electrons between the H2 and O2 evolution photocatalysts. Here, we report a Z-scheme system consisting of H2 evolution photocatalyst (HEP)/metal layer (M)/O2 evolution photocatalyst (OEP), taking SrTiO3:La,Rh/Au/BiVO4 as a prototype. SrTiO3:La,Rh/Au/BiVO4 systems exhibit photocatalytic activities for overall water splitting that are 6 and 20 times higher than powder suspensions and SrTiO3:La,Rh/BiVO4 systems without metal layers, respectively. The SrTiO3:La,Rh/Au/BiVO4 system achieves an apparent quantum yield of 5.9% under monochromatic light irradiation at 418nm and a solar-to-hydrogen conversion efficiency of 0.2%. The high performance of this system is due to the presence of the Au layer that transfers photogenerated electrons from BiVO4 to SrTiO3:La,Rh in an effective manner. The present study offers a new design concept for HEP/M/OEP solid-state devices to overcome the limitations of earlier Z-scheme systems and thus enable efficient photocatalytic water splitting.