Lead-free perovskites have been found to be much more resistant to degradation in water and air than more conventional lead based materials. Here we propose to use lead-free perovskites as photocatalysts in a water splitting experiment. Our group has found that natural double and triple perovskites, using transition metals as the B groups can absorb light, separate charges and donate charges to other molecules in redox reactions. The photoactive nanocrystals will be synthesized by the hot-injection method and characterized by TEM. In the reaction, these NCs are excited using a UV-blue laser or solar simulator and the evolution of hydrogen and oxygen will be monitored by gas chromatography in semi-home built steady-state reaction chamber.