Plasma-Assisted Surface Modifcation on the Electrode Interface for Flexible Fiber-Shaped Zn-Polyaniline Batteries
- Plasma-Assisted Surface Modifcation on the Electrode Interface for Flexible Fiber-Shaped Zn-Polyaniline Batteries
- 이중기; 렌렌; 유현진; 심가영; 김지영; 민 후안 트란; Guicheng Liu; Manciang Wang; Dong Jin Byun
- Plasma; Surface modification; Flexible fiber; Zn-plyanline batteries
- Issue Date
- ACS Applied Materials & Interfaces
- VOL 12-5830
- A novel flexible fiber-shaped zinc− polyaniline battery (FZPB) is proposed to enhance the electrochemical performance, mass loading, and stability of polyaniline cathodes. To this end, electron-cyclotron-resonance oxygen plasma-modified carbon fibers are employed. During plasma treatment, on the carbon-fiber surface, O2 + plasma breaks the C− C, C− H, and C− N bonds to form C radicals, while the O2 molecules are broken down to reactive oxygen species (O+, O2+, O2 +, and O2 2+). The C radicals and the reactive oxygen species are combined to homogeneously form oxygen functional groups, such as − OH, − COOH, and − C O. The surface area and total pore volume of the treated carbon fibers increase as the plasma attacks. During electrodeposition, aniline interacts with the oxygen functional groups to form N− O and N− H bonds and π− π stacking, resulting in a homogeneous and high-loading polyaniline structure and improved adhesion between polyaniline and carbon fibers. In an FZPB, the cathode with plasma-treated carbon fibers and a polyaniline loading of 0.158 mg mgCF − 1 (i.e., 2.36 mg cmCF − 1) exhibits a capacity retention of 95.39% after 200 cycles at 100 mA g− 1 and a discharge capacity of 83.96 mA h g− 1 at such a high current density of 2000 mA g− 1, which are ∼1.67 and 1.24 times those of the pristine carbon-fiber-based one, respectively. Furthermore, the FZPB exhibits high flexibility with a capacity retention of 86.4% after bending to a radius of 2.5 mm for 100 cycles as a wearable energy device.
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