Abstract
Conversion of waste energy into useful energy has become imperative to meet the current need of energy requirements and to build a clean and sustainable world. Thermal energy as heat is an abundant and ubiquitous source of energy wasted or scattered around us in the form of sun light, wind, human motion, and various other forms of heating and cooling systems (heater, vehicle exhaust, etc.). In this regard, pyroelectric nanogenerators (PENGs) are potential candidates for designing energy harvesters using the wasted thermal energy. Therefore, the present chapter portrays an overview of the PENG as energy harvesting system using the thermal fluctuations from the green and mechanical energy sources. First, we briefly discuss the pyroelectric materials, pyroelectric effect, and the working principle of PENGs. Furthermore, different synthesis approaches used to fabricate polymer-based PENGs (PPENGs) and ceramic-based PENGs (CPENGs), and their advanced applications in energy technology are summarized. Furthermore, the challenges and future directions regarding the PENGs are also highlighted.
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