Recently, halide perovskites have been widely explored for high-efficiency photocatalysis or photoelectrochemical (PEC) cells. Here, in order to make an efficient photoanode electrode for the degradation of pollutants, concretely 2-mercaptobenzothiazole (MBT), nanoscale cesium lead bromide (CsPbBr3) perovskite was directly formed on the surface of mesoporous titanium dioxide (meso-TiO2) film using a two-step spin-coating process. This photoelectrode recorded a photocurrent of up to 3.02 ± 0.03 mA/cm2 under standard AM 1.5G (100 mW/cm2) illumination through an optimization process such as introducing a thin aluminum oxide (Al2O3) coating layer. Furthermore, to supply high voltage for efficient oxidation of MBT without an external bias, we developed a new photovoltaic/PEC tandem system using a methylammonium lead iodide (MAPbI3) based mini-module consisting of three solar cells interconnected in series and confirmed its successful operation. This approach looks very promising due to its applicability to various PEC reactions.

Center of Materials and Nanotechnologies Faculty of Chemical Technology University of Pardubice Nam Cs Legii 565 53002 Pardubice Czech Republic

Central European Institute of Technology Brno University of Technology Purkynova 123 612 00 Brno Czech Republic

Department of Chemistry and Research Institute of Physics and Chemistry Jeonbuk National University Jeonju 561 756 South Korea

Facultad de Ciencias Instituto de Ciencias Químicas Isla Teja Universidad Austral de Chile Valdivia 5090000 Chile

Institute of Advanced Materials Universitat Jaume 1 12071 Castelló de la Plana Spain

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