Harvesting solar energy via pyroelectric technology is highly desired because it is a sustainable and clean solution to yield electricity. However, the low power output (below 5mW/m²) and bulky device design of traditional devices hinder their practical applicability. Herein, we demonstrate a highly efficient sunlight-triggered pyroelectric nanogenerator (S-PENG) design that achieves unprecedented performance of 21.3 mW/m² under one sun. This is achieved via enhancing both the solar harvesting properties and the pyroelectric efficiencies rationally by employing polyethyleneimine (PEI) chemically modified reduced graphene oxide (rGO-PEI), and a pyroelectric layer based on a polarized polyvinylidene fluoride (PVDF) film respectively. Moreover, we demonstrate its practical application by adapting the S-PENG into a wearable outdoor bracelet. Using a facile hand-waving motion to replace the traditional bulky sunlight-alternating device, our compact bracelet can charge a fitness tracker after only 1 h of outdoor exposure, demonstrating its capability to be seamlessly integrated with outdoor sports activities. We expect our rational design to promote the development of S-PENG and pave the way for the utilization of sunlight as a viable on-the-go electrical source.

迫切需要通过热电技术来收集太阳能，因为这是一种可持续且清洁的发电方式。但是，传统设备的低功率输出（低于5mW / m ²）和笨重的设备设计阻碍了它们的实用性。本文中，我们演示了一种高效的阳光触发式热电纳米发电机（S-PENG）设计，该设计可实现21.3 mW / m ^2的空前性能在一个阳光下。通过分别采用聚乙烯亚胺（PEI）化学改性的还原氧化石墨烯（rGO-PEI）和基于极化聚偏二氟乙烯（PVDF）膜的热电层，可以合理地提高太阳能的收集性能和热电效率，从而实现这一目标。此外，我们通过将S-PENG适配到可穿戴的户外手镯中来展示其实际应用。我们的紧凑型手镯可以通过轻柔的挥手动作来代替传统的笨重的阳光交替装置，仅在户外暴露1小时后即可为健身追踪器充电，这表明它可以与户外运动活动无缝集成。我们期望我们合理的设计能够促进S-PENG的发展，并为利用阳光作为可行的移动电源铺平道路。