聚3,4-乙烯二氧噻吩/聚4-乙烯基苯磺酸(PEDOT/PSS)水分散体因具有众多优点被公认为是最有前途的商业导电聚合物之一,但由于绝缘的PSS会包裹在其颗粒表面使电荷传递能垒变高,影响导电性。合成的聚3,4-乙烯二氧噻吩/聚丙烯腈-b-聚4-乙烯基苯磺酸(PEDOT/PAN-b-PSS)在水中能形成具有核壳结构的胶束,这种核壳结构以PAN为核,PSS为壳,导电聚合物PEDOT堆积在壳上,增加了颗粒之间PEDOT的接触,可以有效降低电荷传递能垒,提高电导率(8.1S/cm→59.2S/cm),改善电化学性能,并有良好的成膜性(均方根粗糙度≤1.53nm)。将PEDOT/PAN-b-PSS应用于固态电容器中,相对于传统的PEDOT/PSS,能有效降低等效串联电阻(16.1mΩ→6.9mΩ),提高容量引出率(88.3%→95.0%)。为生产企业合成高品质PEDOT水分散体和下游企业选择更合适的PEDOT水分散体提供了技术参考。
Poly(3,4-ethylenedioxythiophene)/poly(sodium-p-styrenesulfonate)(PEDOT/PSS) aqueous dispersion was widely recognized as one of the most promising commercial conductive polymers due to its numerous advantages.However,the insulating PSS tends to wrap around its particle surface,increasing the charge transfer energy barrier and negatively affecting conductivity.The poly(3,4-ethylenedioxythiophene)/polyacrylonitrile-b-poly(sodium-p-styrenesulfonate)(PEDOT/PAN-b-PSS) synthesized in this article could form micelles with a core-shell structure in water.This core-shell structure had PAN as the core and PSS as the shell,and the conductive polymer PEDOT was stacked on the shell,increasing the contact between PEDOT particles.It could effectively reduce the charge transfer energy barrier,improve conductivity (8.1S/cm→59.2S/cm),enhance electrochemical performance,and offer good film-forming properties (root mean square roughness ≤1.53nm).Applying PEDOT/PAN-b-PSS to solid-state capacitors could effectively reduce the equivalent series resistance (16.1mΩ→6.9mΩ) and improve the capacity extraction rate (88.3%→95.0%) compared to traditional PEDOT/PSS.This provided technical reference for the synthesis of high-quality PEDOT aqueous dispersions for production enterprises and the selection of more suitable PEDOT aqueous dispersions for downstream enterprises.
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