Influence of loading Pt, RhO2 co-catalysts on photocatalytic overall water splitting over H1.9K0.3La0.5Bi0.1Ta2O7

• RhO2 was loaded by an in situ photodeposition method without heat treatment.
• HKLBT loaded on RhO2 showed the higher O2 evolution activity and H2/O2 reached 2.
• RhO2 probably works as O2 active sites by reducing the overpotential of O2 evolution.

Pt and Rh (oxides) were loaded on protonated layered pervoskite H1.9K0.3La0.5Bi0.1Ta2O7 by an in situ photodeposition method. It was found that, compared to Pt loading, the Rh loading facilitated the O2 evolution and the ratio of H2/O2 was close to stoichiometric ratio (≈ 2). The HRTEM and XPS analysis indicated that the Rh species loaded on HKLBT were Rh0 and RhO2. The RhO2 loaded on HKLBT could provide the active sites for O2 evolution by means of reducing the overpotential of O2 evolution.

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