Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 143, Issue 10, Pages 4017-4023Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.1c00666
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Funding
- National Key R&D Program of China [2018YFB1304700, 2017YFA0701101]
- National Natural Science Foundation of China [62071463, 62071462, 61801473, 51702354]
- Youth Promotion Association of Chinese Academy of Sciences [2020320]
- Innovative and Entrepreneurial Doctor (World-Famous Universities) in Jiangsu Province
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A two-dimensional conductive metal-organic framework based electrochemical actuator with improved actuation performance, high diffusion rate, and low interfacial resistance was developed. This actuator demonstrated a broad-band frequency response and long-term cycling performance, offering new opportunities for bioinspired artificial actuators and overcoming current limitations in electrode materials for soft robotics and bionics.
Electrically activated soft actuators capable of large deformation are powerful and broadly applicable in multiple fields. However, designing soft actuators that can withstand a high strain, provide a large actuation displacement, and exhibit stable reversibility are still the main challenges toward their practical application. Here, for the first time, we report a two-dimensional (2D) conductive metal-organic framework (MOF) based electrochemical actuator, which consists of vertically oriented and hierarchical Ni-CAT NWAs/CNF electrodes through the use of a facile one-step in situ hydrothermal growth method. The soft actuator prepared in this study demonstrated improvements in actuation performance and benefits from both the intrinsically ordered porous architecture and efficient transfer pathways for fast ion and electron transport; furthermore, this actuator facilitated a considerably high diffusion rate and low interfacial resistance. In particular, the actuator demonstrated a rapid response (<19 s) at a 3 V DC input, large actuation displacement (12.1 mm), and a correspondingly high strain of 0.36% under a square-wave AC voltage of +/- 3 V. Specifically, the actuator achieved a broad-band frequency response (0.1-20 Hz) and long-term cyclability in air (10000 cycles) with a negligible degradation in actuation performance. Our work demonstrates new opportunities for bioinspired artificial actuators and overcomes current limitations in electrode materials for soft robotics and bionics.
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