Vereshchagin Anatoliy A, Potapenkov Vasiliy V, Vlasov Petr S, Lukyanov Daniil A, Levin Oleg V
Institute of Chemistry, Saint Petersburg University, 199034 St. Petersburg, Russia.
Nanomaterials (Basel). 2022 Jun 3;12(11):1917. doi: 10.3390/nano12111917.
Anionic catechol-containing polymers represent a promising class of functional dopants for the capacity improvement of conductive polymers. For example, sulfonated poly(vinylcatechol) SPVC with outstanding theoretical capacity was used as a dopant for poly(ethylenedixythiophene) (PEDOT) conductive polymer, increasing its energy storage performance. However, such materials suffer from insufficient utilization of the theoretical capacity of SPVC originating from non-optimal morphology. In the present study, we performed systematic optimization of the composition and morphology of the PEDOT:SPVC material as a function of the deposition parameters to overcome this problem. As a result, a capacity of 95 mAh·g was achieved in a thin film demonstrating considerable electrochemical stability: 75% capacity retention after 100 cycles and 57% after 1000 cycles. Since the capacity was found to suffer from thickness limitation, a nanocomposite of PEDOT:SPVC and single-walled carbon nanotubes with high PEDOT:SPVC loading was fabricated, yielding the capacitance 178 F·g or 89 F·cm. The capacity values exceed non-optimized film twofold for thin film and 1.33 times for nanocomposite with carbon nanotubes. The obtained results demonstrate the importance of fine-tuning of the composition and morphology of the PEDOT:SPVC materials to ensure optimal interactions between the redox/anionic and conductive components.
含阴离子儿茶酚的聚合物是一类很有前途的功能掺杂剂，可用于提高导电聚合物的容量。例如，具有出色理论容量的磺化聚（乙烯基儿茶酚）（SPVC）被用作聚（乙撑二氧噻吩）（PEDOT）导电聚合物的掺杂剂，提高了其储能性能。然而，这类材料存在源于非最佳形态的SPVC理论容量利用率不足的问题。在本研究中，我们对PEDOT:SPVC材料的组成和形态进行了系统优化，作为沉积参数的函数，以克服这一问题。结果，在薄膜中实现了95 mAh·g的容量，表现出相当大的电化学稳定性：100次循环后容量保持率为75%，1000次循环后为57%。由于发现容量受厚度限制，制备了高PEDOT:SPVC负载量的PEDOT:SPVC与单壁碳纳米管的纳米复合材料，电容为178 F·g或89 F·cm。对于薄膜，容量值比未优化的薄膜高出两倍，对于含碳纳米管的纳米复合材料则高出1.33倍。所得结果表明，对PEDOT:SPVC材料的组成和形态进行微调以确保氧化还原/阴离子与导电组分之间的最佳相互作用非常重要。
