Peng Shan, Xie Binglin, Wang Yanlei, Wang Mi, Chen Xiaoxin, Ji Xiaoyu, Zhao Chenyang, Lu Gang, Wang Dianyu, Hao Ruiran, Wang Mingzhan, Hu Nan, He Hongyan, Ding Yulong, Zheng Shuang
Department of Inorganic Chemistry, College of Chemistry and Materials Science, Key Laboratory of Medicinal Chemistry and Molecular Diagnosis of Ministry of Education, Key Laboratory of Analytical Science and Technology of Hebei Province, Hebei University, Baoding, Hebei 071002, China.
School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China.
Proc Natl Acad Sci U S A. 2023 Sep 19;120(38):e2303466120. doi: 10.1073/pnas.2303466120. Epub 2023 Sep 11.
Low-grade wind with airspeed < 5 m/s, while distributed far more abundantly, is still challenging to extract because current turbine-based technologies require particular geography (e.g., wide-open land or off-shore regions) with year-round > 5 m/s to effectively rotate the blades. Here, we report that low-speed airflow can sensitively enable directional flow within nanowire-anchored ionic liquid (IL) drops. Specifically, wind-induced air/liquid friction continuously raises directional leeward fluid transport in the upper portion, whereas three-phase contact line (TCL) pinning blocks further movement of IL. To remove excessive accumulation of IL near TCL, fluid dives, and headwind flow forms in the lower portion, as confirmed by microscope observation. Such stratified circulating flow within single drop can generate voltage output up to ~0.84 V, which we further scale up to ~60 V using drop "wind farms". Our results demonstrate a technology to tap the widespread low-grade wind as a reliable energy resource.
风速小于5米/秒的微风虽然分布更为广泛，但由于目前基于涡轮机的技术需要特定的地理条件（如开阔的陆地或近海区域）且全年风速大于5米/秒才能有效转动叶片，因此提取这种微风仍具有挑战性。在此，我们报告低速气流能够灵敏地在纳米线锚定的离子液体（IL）液滴内实现定向流动。具体而言，风致气/液摩擦持续增强上部背风方向的流体传输，而三相接触线（TCL）钉扎作用则阻止了离子液体的进一步移动。为消除离子液体在三相接触线附近的过度积聚，流体下沉，显微镜观察证实下部形成逆风流动。单液滴内的这种分层循环流动可产生高达约0.84伏的电压输出，我们使用液滴“风电场”进一步将其扩大至约60伏。我们的结果展示了一种利用广泛存在的微风作为可靠能源的技术。
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