镍基金属有机骨架材料对电化学驱动器的二维效应,ACS Applied Electronic Materials

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镍基金属有机骨架材料对电化学驱动器的二维效应
ACS Applied Electronic Materials ( IF 4.3 ) Pub Date : 2023-11-28 , DOI: 10.1021/acsaelm.3c01170
Zhi-Xiang Guo ₁ , Jing-Rui Zhang ₁ , Yi-Ren Liu ₁ , Hui-Chan Deng ₁ , Peng-Hui Meng ₁ , Yang Li ₁ , Ying Wei ₁ , Yu-He Kan ₂ , Sha-Sha Wang ₁ , Ling-Hai Xie ₁

Affiliation

电化学执行器的性能主要取决于电子/离子的迁移路径、离子存储空间和机械强度。尽管许多研究致力于开发电极材料的精细分层结构以实现更好的驱动效果，但材料尺寸与驱动特性之间的潜在关系却很少被研究。在此，将具有相同组成和晶相的三种不同尺寸的Ni-1,4-苯二甲酸微结构引入到PEDOT:PSS电极层中。通过比较它们的电导率、电容和机械性能，二维Ni-1,4-苯二甲酸样品表现出最好的电导率（175.1 S cm ^–1）、离子电导率（1.07 × 10 ^–4 S cm ^–1）、电荷转移电阻（3.48 Ω）、电容（12.64 mF cm ^–2）、响应速度（1.02 mm s ^–1）、杨氏模量（34.89 MPa）和应力（0.195 mN）。在±3 V低电压测试条件下，偏转位移达到17.6 mm，是纯PEDOT:PSS电极（4.2 mm）的四倍。驱动应变高达0.57%（PEDOT:PSS的驱动应变为0.2%），机电转换效率为2.78%，这归因于二维纳米结构为电化学反应提供了大的表面积和丰富的活性位点。独特的二维层促进了离子在整个电极上更快的扩散和积累，缩短了电化学反应过程中离子的扩散距离。

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Two-Dimensional Effects of Ni-Based Metal–Organic Framework Materials on Electrochemical Actuators

The performance of electrochemical actuators is mainly based on the migration path of the electron/ion, the ion storage space, and the mechanical strength. Despite many studies devoted to developing elaborate hierarchical architectures of electrode materials to achieve a better actuation effect, the underlying relationship between the dimensions of materials and the actuation properties has been seldom investigated. Herein, three different dimensions of Ni-1,4-benzenedicarboxylic acid microstructures sharing the same composition and crystal phase were introduced into the PEDOT:PSS electrode layer. By comparing their conductivity, capacitance, and the mechanical properties, the two-dimensional Ni-1,4-benzenedicarboxylic acid sample exhibited the best electrical conductivity (175.1 S cm^–1), ion conductivity (1.07 × 10^–4 S cm^–1), charge transfer resistance (3.48 Ω), capacitance (12.64 mF cm^–2), response speed (1.02 mm s^–1), Young’s modulus (34.89 MPa), and stress (0.195 mN). Under low-voltage testing conditions of ±3 V, the deflection displacement reached 17.6 mm, which is four times higher than that of the pure PEDOT:PSS electrode (4.2 mm). The driving strain was as high as 0.57% (PEDOT:PSS’s driving strain was 0.2%), and the electromechanical conversion efficiency was 2.78%, attributed to two-dimensional nanostructures providing a large surface area and abundant active sites for electrochemical reaction. The unique two-dimensional layer promotes a faster diffusion and accumulation of ions on the entire electrode and shortens the diffusion distance of ions in the electrochemical reaction process.

更新日期：2023-11-28

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