Nowadays, getting energy from natural resources has become an area of interest for researchers with the increasing demand for renewable energy sources. Like triboelectric (TENG) and piezoelectric nanogenerators (PENG), which generate electrical energy from mechanical energy, pyroelectric nanogenerators (PyNG) can also convert the waste heat in the environment into electrical energy through pyroelectric materials. Especially with the integration of PyNG into wearable electronics, the wasted heat in the environment can easily and effortlessly be made ready for use. Besides, PyNGs can be integrated into masks that have become an indispensable part of our lives with the Covid-19 pandemic, which has become a global health problem today and affected the whole world. Wearable electronics' energy requirement can be met by converting waste heat into electrical energy without any extra effort. In this paper, the theory of the pyroelectric effect, pyroelectric materials, and the structure of PyNGs, and the latest developments in micro/nanoscale devices are presented; efficient materials and future challenges opportunities are discussed.

如今，随着对可再生能源的需求不断增长，从自然资源中获取能源已成为研究人员关注的领域。像摩擦电（TENG）和压电纳米发电机（PENG）可以从机械能中产生电能一样，热电纳米发电机（PyNG）也可以通过热电材料将环境中的废热转化为电能。特别是通过将PyNG集成到可穿戴电子设备中，可以轻松，轻松地准备好环境中浪费的热量。此外，PyNG可以集成到口罩中，而Covid-19大流行已成为人们生活中不可或缺的一部分，而Covid-19大流行已成为当今全球健康问题，并影响了整个世界。穿戴式电子产品 通过将废热转化为电能可以满足能源需求，而无需任何额外的努力。本文介绍了热电效应的理论，热电材料，PyNGs的结构以及微/纳米器件的最新进展。讨论了高效材料和未来挑战的机会。