The new technologies underlying self-powering gadgets made especially for gas sensing applications are examined in this chapter. Autonomous gas sensors that can function without external power sources are becoming more and more necessary as the Internet of Things (IoT), smart cities, and environmental monitoring systems expand quickly. In order to meet this need, self-powered gas sensors combine sensitive detecting platforms with energy harvesting technologies, allowing for long-term, maintenance-free operation even in harsh or remote situations. The basic ideas of self-powered sensing systems and the driving forces behind their creation are presented at the beginning of the chapter. After that, it looks at a number of energy harvesting techniques, such as piezoelectric, triboelectric, thermoelectric, and photovoltaic approaches, that can be used to power gas sensors. The working principle, material requirements, output performance, and ability to integrate with gas-sensing components are all covered for each technique. Triboelectric and piezoelectric nanogenerators (TENGs and PENGs) are specifically highlighted since they have shown great promise in generating electricity from ambient mechanical energy to power low-energy gas sensors. Additionally, the chapter highlights advancements in multifunctional materials that combine both energy generation and gas detection capabilities, enabling more compact and efficient sensor designs. Challenges such as low power output, stability, and energy storage integration are critically discussed, along with strategies to overcome these issues through advanced materials and system-level optimization. The chapter concludes by outlining future directions and research opportunities in the field, emphasizing the role of self-powered gas sensors in enabling sustainable, scalable, and intelligent sensing systems for next-generation applications.
