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Adjusting Competitive Reaction to Control Nucleation and Growth of MnO2 for a High-Stress Output Electrochemical Actuator
Linköping University, Department of Physics, Chemistry and Biology, Sensor and Actuator Systems. Linköping University, Faculty of Science & Engineering. Northeastern Univ, Peoples R China.ORCID iD: 0000-0002-7306-8722
Northeastern Univ, Peoples R China.
Northeastern Univ, Peoples R China.
Northeastern Univ, Peoples R China.
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2023 (English)In: ACS APPLIED ELECTRONIC MATERIALS, ISSN 2637-6113, Vol. 5, no 9, p. 4836-4845Article in journal (Refereed) Published
Abstract [en]

Manganese dioxide (MnO2) with biocompatibility has promising applications in low-voltage electrochemical actuators of implantable medical devices, which can convert electrical energy to mechanical motion. However, the unsatisfactory actuation strain restricts the generation of a larger output stress of MnO2 for practical application. Herein, a competitive reaction-driven-MnO2 (CRD-MnO2) nanorod network was fabricated on a nickel (Ni) thin-film substrate by adjusting the component molar ratios. We find that the competitive reaction between 3,4-ethylene-dioxythiophene (EDOT) polymerization and oxidation of Mn2+ controls the nucleation and growth behavior of MnO2. The variation in the electron environment, newly generated oxygen vacancies, and a higher content of structural water effectively improve the electroactivity of MnO2 and simultaneously cause more serious Jahn-Teller (JT) distortion of the crystal octahedrons. Thus, an excellent output performance simultaneously having a much higher actuating strain of 8.3% and an actuation stress of 390.1 MPa is generated during a redox reaction between Mn4+ and Mn3+ under 0-1 V. Moreover, the CRD-MnO2/Ni composite actuating films assembled on a 3D-printed resin model of a human hand with separated finger joints can perform smooth grasping and releasing actions, demonstrating a huge potential for in vitro rehabilitation exercises and implantability for people with finger dyskinesia. This work provides a strategy for actuator material fabrication by controlling a nucleation and growth process by adjusting a competitive reaction.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2023. Vol. 5, no 9, p. 4836-4845
Keywords [en]
manganese dioxide; competitive reaction; electrochemicalactuator; high output stress; artificial muscle
National Category
Textile, Rubber and Polymeric Materials
Identifiers
URN: urn:nbn:se:liu:diva-198253DOI: 10.1021/acsaelm.3c00634ISI: 001063591600001OAI: oai:DiVA.org:liu-198253DiVA, id: diva2:1801882
Note

Funding Agencies|National Natural Science Foundation of China [51971060, 51671050]; China Scholarship Council [202106080077]

Available from: 2023-10-03 Created: 2023-10-03 Last updated: 2024-04-09Bibliographically approved

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