Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong SAR, China.
Thrust of Sustainable Energy and Environment, The Hong Kong University of Science and Technology (Guangzhou), Nansha, Guangzhou, 511400, Guangdong, China.
Nat Commun. 2023 Feb 23;14(1):1023. doi: 10.1038/s41467-023-36675-x.
Surface wear is a major hindrance in the solid/solid interface of triboelectric nanogenerators (TENG), severely affecting their output performance and stability. To reduce the mechanical input and surface wear, solid/liquid-interface alternatives have been investigated; however, charge generation capability is still lower than that in previously reported solid/solid-interface TENGs. Thus, achieving triboelectric interface with high surface charge generation capability and low surface wear remains a technological challenge. Here, we employ metallic glass as one triboelectric interface and show it can enhance the triboelectrification efficiency by up to 339.2%, with improved output performance. Through mechanical and electrical characterizations, we show that metallic glass presents a lower friction coefficient and better wear resistance, as compared with copper. Attributed to their low atomic density and the absence of grain boundaries, all samples show a higher triboelectrification efficiency than copper. Additionally, the devices demonstrate excellent humidity resistance. Under different gas pressures, we also show that metallic glass-based triboelectric nanogenerators can approach the theoretical limit of charge generation, exceeding that of Cu-based TENG by 35.2%. A peak power density of 15 MW·m is achieved. In short, this work demonstrates a humidity- and wear-resistant metallic glass-based TENG with high triboelectrification efficiency.
表面磨损是摩擦纳米发电机（TENG）固/固界面的主要障碍，严重影响其输出性能和稳定性。为了减少机械输入和表面磨损，已经研究了固/液界面替代物；然而，电荷产生能力仍然低于之前报道的固/固界面 TENG。因此，实现具有高表面电荷产生能力和低表面磨损的摩擦电界面仍然是一项技术挑战。在这里，我们采用金属玻璃作为一个摩擦电界面，并展示了它可以将摩擦电效率提高高达 339.2%，从而提高输出性能。通过机械和电气特性分析，我们表明金属玻璃具有较低的摩擦系数和更好的耐磨性，优于铜。由于其低原子密度和没有晶界，所有样品的摩擦电效率都高于铜。此外，这些器件还表现出优异的耐湿性。在不同的气压下，我们还表明，基于金属玻璃的摩擦纳米发电机可以接近电荷产生的理论极限，比基于 Cu 的 TENG 高出 35.2%。实现了 15 MW·m 的峰值功率密度。总之，这项工作展示了一种具有高摩擦电效率、耐湿性和耐磨性的基于金属玻璃的 TENG。
