Solar energy has gained significant interest as a sustainable alternative to fossil fuels, with solar-driven water splitting being a technology aimed at converting and storing solar energy into hydrogen, a clean and high-energy-density fuel. This article discusses the challenges faced by traditional photocatalytic systems in achieving high solar-to-hydrogen (STH) conversion efficiencies due to energy barriers and low light absorption. To overcome these challenges, a Z-scheme photocatalytic water splitting system is proposed, utilizing separate cells for hydrogen and oxygen production and the I3−/I− redox shuttle to achieve an STH efficiency of 2.47%. The use of mixed halide perovskite FPBI with MoSe2 for H2 production and NiFe-LDH/BiVO4 for O2 production enables efficient and scalable water splitting with no backward reactions. The system successfully demonstrates an average STH efficiency of 1.21% over natural sunlight conditions. The integration of particulate perovskite on an acrylic plate substrate allows for the scaling up of photocatalytic systems, showcasing the potential for practical implementation in hydrogen production. Overall, the developed Z-scheme solar water splitting system presents a promising approach for efficient and sustainable hydrogen production from water.