The development of portable power banks by using triboelectric nanogenerator-based technology has been a subject of great interest. However, when the potential wide range of future applications of such devices is considered, their heavy use of nanomaterials, polymers, and micro/nano fabrication technologies will increase the cost of and the energy consumed during production; moreover, their improper disposal may harm the environment. Here, we demonstrate portable card-type triboelectric nanogenerators (Card-TENGs) assembled by using less problematic, readily available materials through a top-down approach. The Card-TENGs are fabricated mainly from paper, including card paper and printer paper, which can greatly reduce the fabrication cost and the risk to the environment. Electricity can be generated simply by shaking the Card-TENGs, and Card-TENGs can be combined to form single and multilayer structures, which will enhance their electrical output. Furthermore, the as-fabricated Card-TENGs can be easily integrated into packs to increase the total output for lighting LEDs arrays and powering calculators.

通过使用基于摩擦电纳米发电机的技术来开发便携式移动电源已经引起了人们的极大兴趣。但是，当考虑到此类设备未来的潜在广泛应用时，它们对纳米材料，聚合物和微/纳米制造技术的大量使用将增加生产过程中的成本和能耗。此外，它们的不当处置可能会危害环境。在这里，我们演示了通过自上而下的方法使用问题较少，易于获得的材料组装而成的便携式卡式摩擦电纳米发电机（Card-TENGs）。Card-TENGs主要由纸制成，包括证卡纸和打印机纸，可以大大降低制造成本和对环境的风险。只需摇动Card-TENG，即可产生电能，Card-TENG可以组合形成单层和多层结构，这将提高其电输出。此外，预制的Card-TENG可以轻松集成到包装中，以增加照明LED阵列和计算器供电的总输出。