Ru-doped all-inorganic lead-halide perovskite quantum dots photoanode with water oxidation catalyst

All-inorganic perovskite quantum dots have attracted much attention in the photovoltaic field due to their tunable bandgap and quantum confinement effect. However, the low photoconversion efficiency and notorious water stability limit its application in photocatalytic water splitting. Herein, we synthesized Ru- CsPbBr3 quantum dots by hot injection and protected them using graphite thermal sheets as photoanodes. The successful doping of ruthenium with high catalytic activity not only improves light absorption but also promotes carrier separation. The photocurrent of Ru-CsPbBr3 QDs is thus increased by three times (1.81 mA cm-2 at 1.23 VRHE) and can be continuously illuminated underwater for 20 minutes. This method provides an idea for studying water splitting of perovskites.