Deformation mechanism of hydrogen-assisted ionic polymer metal composite actuator
Deformation mechanism of hydrogen-assisted ionic polymer metal composite actuator
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DOI：
10.1080/15376494.2021.2011990
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发表时间：
2021-12
影响因子：
2.8
通讯作者：
M. Omiya;M. Kurokawa
中科院分区：
文献类型：
--
作者：
M. Omiya;M. Kurokawa
氢能源有望成为未来可持续社会的主要动力来源。因此，开发适应氢气使用的机械部件或系统是一个关键问题。离子聚合物金属复合材料（IPMC）执行器是由涂有电极的电解质聚合物膜构成的。由于其重量轻、灵活和易于小型化，IPMC执行器是小型机器人、微阀或人造肌肉中用作微执行器的有希望的候选者。研制了一种氢辅助IPMC致动器，并对其变形机理进行了研究。水裂解产生的氢吸收和电解质中水合阳离子的运动是该执行器的驱动力。研究了施加电压、钯电极厚度和致动器长度对致动器性能的影响。此外，还分别阐明了水合阳离子运动弯矩和氢吸收弯矩对弯曲变形的贡献。结果表明，氢辅助IPMC致动器的变形机制与外加电压、钯电极厚度和致动器长度有关。氢离子的辅助作用随外加电压的增加而减小，而水合阳离子的运动作用则增加。此外，试样长度越短，氢致弯矩比越大。这些结果表明，氢对具有更短、更薄钯电极的IPMC致动器的弯曲变形辅助作用更有效。
Abstract Hydrogen power sources are expected to be the main power source for a sustainable society in the future. Therefore, the development of mechanical parts or systems to adapt to the usage of hydrogen is a key issue. Ionic polymer metal composite (IPMC) actuators are composed of an electrolyte polymer membrane coated with electrodes. Owing to their light weight, flexibility, and ease of miniaturization, IPMC actuators are promising candidates for use as micro-actuators in small robots, microvalves, or artificial muscles. In this study, a hydrogen-assisted IPMC actuator is developed, and its deformation mechanism is investigated. The hydrogen absorption produced by water splitting and the hydrated cation movement in the electrolyte are the driving forces involved in this actuator. The effects of applied voltage, thickness of palladium electrodes, and length of the actuators are studied. Moreover, the contributions of bending moments by a hydrated cation movement and those by hydrogen absorption to the bending deformation are separately clarified. The results indicate that the deformation mechanism of the hydrogen-assisted IPMC actuator depends on the applied voltage, palladium-electrode thickness, and actuator length. The contribution of the hydrogen assistance decreases with the applied voltage, while that of the hydrated cation movement increases. In addition, the specimen with a shorter length exhibits a larger hydrogen-induced moment ratio. These results suggest that the hydrogen assistance to the bending deformation is more effective in IPMC actuators with a shorter and thinner palladium electrode.