News Release

寻找清洁能源的新窍门

Peer-Reviewed Publication

American Association for the Advancement of Science (AAAS)

A New Twist Toward Practical Energy Harvesting

video: Demonstration of how a twistron harvester could be used as a strain sensor. This type of sensor could be used for things such as monitoring breathing, if sewn into a shirt for example. This material relates to a paper that appeared in the Aug. 25, 2017, issue of <i>Science</i>, published by AAAS. The paper, by S.H. Kim at Hanyang University in Seoul, South Korea, and colleagues was titled, "Harvesting electrical energy from carbon nanotube yarn twist." view more 

Credit: S.H. Kim <i>et al., Science</i> (2017)

科学家们研发出了一种由碳纳米管制成的“纱线”,它能通过扭曲或拉伸运动而收集能量。这样一种方法或对研发运动传感器有用或能用于从海洋波涛(或其它来源)收集能量。将机械能转变为电能是一种吸引人的方法,它能用来创建自供电设备及利用源自天然的能量。然而,利用源自拉伸或扭曲运动能量的努力一直局限于电流非常小的电路。在这里,Shi Hyeong Kim和同事发现,在某种材料中增加一些格外的扭曲可持续很久。他们将多壁碳纳米管片纺成高强度纱线。研究人员不只是对它们略加扭曲,而是将这些纳米管片进行极度紧致的扭曲,令它们形成线圈。在分析这些线圈将弹簧样运动转变为能量的能力时,他们发现,这些线圈的能量转化要比那些只被扭曲但没有形成线圈的材料有效得多。少量解除线圈状纱线的扭曲不会导致线圈的丧失,它只是增加了线圈的直径,从而增加了其导电能力。研究人员将线圈状纳米管纳入电池内来创建一个能量收集装置,他们称其为twistron收获器。他们在南韩离岸区域测试了twistron从海洋波涛收集能量的能力;该长10厘米的装置可达到46mV的电压及平均1.79 mW的输出功率。同样地,他们展示了该装置是如何能充当一种运动传感器的,例如,它能被缝入一件衬衫来监测与呼吸相关的运动。

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