Triboelectric nanogenerator (TENG) has been proved as a powerful approach to harvest ambient mechanical energy for many technological applications. However, the service lifetime, stability and robustness of TENG are a challenge owing to the wearing and surface degradation. In this manuscript, liquid lubrication is introduced for the first time to increase the anti-wear property of TENG. The influence of the lubricant layer between the surfaces on TENG outputs is studied. It is surprising to find that proper liquid lubrication can not only provide a super wear-resistive TENG, but also can increase the electric outputs. In comparison to a slide-mode TENG with solid-solid contact, the service life of TENG can be greatly improved through liquid lubrication and there is no detected wear even after 36,000 cycles of operation. Specially, the open-circuit voltage and short-circuit current of squalane-lubricated TENG can be both more than 3 times of the unlubricated TENG. For unlubricated TENG, a transfer polymer film adheres to the harder material surface and reduces the contact effectiveness. Liquid lubrication is able to avoid the formation of the transfer film, increase the effective solid-solid contact area and squeeze the air at the interface, thus giving rise to higher electric outputs. Our study opens a new approach for extending the lifetime and stability of TENGs.

摩擦电纳米发电机（TENG）已被证明是一种为许多技术应用收集环境机械能的有效方法。但是，由于磨损和表面退化，TENG的使用寿命，稳定性和坚固性是一个挑战。在此手稿中，首次引入了液体润滑以提高TENG的抗磨性能。研究了表面之间的润滑层对TENG输出的影响。令人惊讶地发现，适当的液体润滑不仅可以提供超强的TENG耐磨性，而且还可以增加电输出。与具有固-固接触的滑模式TENG相比，TENG的使用寿命可以通过液体润滑大大提高，即使经过36,000次操作循环，也没有发现磨损。特别，角鲨烷润滑的TENG的开路电压和短路电流均可以是未润滑的TENG的3倍以上。对于未润滑的TENG，转移聚合物薄膜会粘附在较硬的材料表面，从而降低接触效率。液体润滑能够避免形成转移膜，增加有效的固-固接触面积并挤压界面处的空气，从而产生更高的电输出。我们的研究为延长TENG的寿命和稳定性开辟了一种新方法。增加有效的固-固接触面积并挤压界面处的空气，从而产生更高的电输出。我们的研究为延长TENG的寿命和稳定性开辟了一种新方法。增加有效的固-固接触面积并挤压界面处的空气，从而产生更高的电输出。我们的研究为延长TENG的寿命和稳定性开辟了一种新方法。