Modern triboelectric and piezoelectric nanogenerators (TENG and PENG) stand at the forefront of sustainable energy harvesting technologies, addressing the global challenge of eco-friendly and efficient power solutions. These systems leverage mechanical energy from ambient sources, converting it into electrical energy with remarkable efficiency. The integration of noble metal-based hybrid composites, utilizing materials like gold, silver, and platinum, has dramatically enhanced their functionality. These metals, renowned for their exceptional electrical conductivity, chemical inertness, and plasmonic properties, enable TENG and PENG systems to achieve energy conversion efficiencies exceeding 90% under controlled conditions, while specific configurations demonstrate power densities surpassing 200 µW/cm2. Innovative fabrication techniques such as 3D printing, hydrothermal synthesis, and stereoscopic membrane fabrication have allowed the development of flexible, stretchable, and robust nanogenerators. These systems have demonstrated transformative applications in optoelectronics, with surface plasmon resonance (SPR) facilitating unprecedented enhancements in LED brightness and photodetector sensitivity. For example, noble metal-enhanced photodetectors exhibit a 300% increase in sensitivity under low-light conditions compared to traditional devices. In IoT ecosystems, noble metal-based TENG and PENG technologies enable self-powered sensors for real-time environmental monitoring, coupled with machine learning algorithms for dynamic energy optimization. These hybrid systems also hold promise for next-generation quantum optics, high-speed telecommunications, and photonic computing, where precise control of light-matter interactions is paramount. However, challenges such as the high cost of noble metals and the scalability of production techniques persist, necessitating ongoing research into cost-effective materials and scalable fabrication methods. This chapter underscores the transformative potential of noble metal-based hybrid composites in energy and optical applications, paving the way for sustainable innovation across industries. By addressing current limitations and leveraging advanced technologies, these systems are poised to redefine global energy solutions and foster advancements in emerging technological frontiers.