To overcome the ultraviolet-only limitations of conventional titanium dioxide (TiO₂) photocatalysts, this project developed a novel visible-light-responsive composite for solar-driven hydrogen production. High-surface-area silicon nanowires (SiNWs) were fabricated via a metal-assisted chemical etching (MACE) process from recycled silicon wafer scraps, creating an efficient light-absorbing scaffold while minimizing material waste. These SiNWs were then uniformly coated with molybdenum disulfide (MoS₂) by drop casting to form a robust photocatalytic composite. MoS₂, a transition metal dichalcogenide, provides abundant active sites for the hydrogen evolution reaction, complementing the light-harvesting capability of SiNWs. Material characterization by scanning electron microscopy (SEM) and energy- dispersive X-ray spectroscopy (EDS) confirmed the formation of dense SiNW arrays with successful MoS₂ coating, while Raman spectroscopy verified the presence and crystalline quality of the MoS₂ layer. Photocatalytic water-splitting experiments demonstrated that increasing the MoS₂ deposition significantly enhanced the hydrogen evolution rate. Under simulated solar illumination, the SiNW–MoS₂ electrodes achieved significantly higher hydrogen production compared to dark conditions, confirming effective visible-light utilization. Furthermore, the addition of co-catalysts—namely gold nanoparticles and a high-entropy alloy (AgAlCuNiTi)— further boosted the catalytic performance. The highest hydrogen output was observed in samples incorporating both MoS₂ and the high-entropy alloy under illumination, highlighting a strong synergistic effect between the SiNW and MoS₂ components. Overall, the SiNW/MoS₂ composite represents a cost-effective and scalable strategy for efficient hydrogen generation using the broad visible spectrum of sunlight. By repurposing waste silicon and employing visible-light-active catalysts, this innovation addresses sustainability and aligns with United Nations Sustainable Development Goal 7 (Affordable and Clean Energy), offering a promising green energy solution.