| The world needs to fix two major issues with the increase in population that is energy and environmental issue and photocatalysis of water splitting is a one-of-a-kind technique for dealing with energy and environmental issues. The water splitting method produces the hydrogen gas, which is cleanest from of energy and can be store after the production. However, there is need of photocatalyst which uses solar energy to produce hydrogen gas using this method. A good photocatalytic material should be non-toxic, inexpensive, and very effective in converting light into energy. The two predominant photocatalytic compounds found to be PCN and ZnO. These two semiconductors haven been used as photocatalyst for many purposes, but exhibit low catalytic activity towards hydrogen evolution reaction due to low solar to hydrogen efficiency which is about 10% as the band gap is about 2.7-3.2 eV and not having enough specific surface area for reaction to occur. The efficiency of solar to hydrogen is about 50% for the materials having the band gap in the range of 1.7-2.4 eV that is enough energy is harvested, and at the same time there is enough energy for hydrogen evolution reaction. Therefore, there is a need for materials with high harvesting capacity, but also with high surface active area. The solution of this issue can be resolved, with the modulation of PCN fundamental properties that can be done with the formation of nanocomposite with metal oxides such ZnO and AIOOH-ZrO2. The heterostructuring not only modulates the band gap, enhances surface activity but it also provides thermal stability. |