Ionic Polymer Metal Composites is a new type of smart material. IPMC's drive performance is very similar to that of biomuscular, so it is called "artificial muscle." It has the advantages of simple structure, easy miniaturization, flexibility, no noise, flexible operation, large output-to-weight ratio, high energy conversion efficiency, etc. It can be widely used in bionic robots, micro medical devices, microfluidics, human-computer interaction, etc. Industrial medicine.
At present, the smart material is mainly composed of a cation exchange membrane and a precious metal electroless plating method such as platinum. The precious metal electrode used is expensive and raw materials are rare. Therefore, finding cheap and large-scale materials that can replace noble metal electrodes has become a hot topic for scholars at home and abroad. It also has important application value.
The latest research results show that carbon nanotubes and graphene are one-dimensional and two-dimensional nanomaterials with special structures and properties, with excellent anisotropic electrical, thermal, and thermal properties. The 3D carbon nanostructures formed by them have highly stable electrical, electrochemical, mechanical properties and rich surface functionalization pathways, showing obvious advantages in the field of bionic smart materials.
However, carbon nanotubes and graphene electrode materials prepared by the redox method are still difficult to compare with metal electrodes because of their conductive properties, which makes the electrochemical driving frequency response of the materials unable to be further improved. The main reason is that the conductivity of the electrode material is not only related to the electrical conductivity of the carbon nanomaterial itself, but also more importantly embodied in the construction of an effective conductive channel in the composite material.
Recently, the research group of Chen Wei of the Suzhou Institute of Nanotechnology, Chinese Academy of Sciences, designed and prepared electrodes coated with graphene nanoparticles, and successfully obtained a new electrochemically stable ion-polymer composite electric driving device. Although the traditional silver material has good conductivity, it is also a relatively abundant material resource in the natural world. However, due to its redox reaction during electrochemical charge and discharge, it is difficult to be used as a stable electrochemical electrode material. The graphene and carbon nanotube materials have relatively inert electrochemical properties and have high reversible characteristics during electrochemical charge and discharge. Therefore, in order to use not only the high conductivity of silver, but also to avoid electrochemical erosion, the research group designed and prepared a two-dimensional graphene-coated Ag nanoparticle electrode material.
The following results show that the nano-silver composite electrode is coated with graphene surface during electrochemical charge and discharge, thereby forming a stable double-layer capacitance with the electrolyte, which effectively utilizes the highly conductive properties of silver and realizes Broad-band (0.01-10Hz) large-displacement stable electrochemical driving characteristics of graphene-coated Ag nanoparticles against Redox electrodes. Related results have been published online at Adv. Mater. (DOI: 10.1002/adma.201203655).
This work has received strong support from the National Natural Science Foundation of China, the Ministry of Science and Technology and the Natural Science Foundation of Jiangsu Province.
Electrode preparation schematic, SEM image, electrochemical, electromechanical characterization and electrochemical process schematic
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