Abstract In this work, we have demonstrated, a facile synthesis of the ternary composite of strontium oxide-polyaniline-graphene (SrO-PANI-Gr) for hybrid energy storage applications. The electrochemical performance of the synthesized material is initially characterized in three electrode assembly. This nanomaterial indicates a specific capacity of 164C/g. In order to enhance the electrochemical performance of pristine SrO (S1), it is further physically blended with polyaniline in a 50/50% mass ratio which shows a specific capacity of 200C/g with lower rate capability. To further improve electrochemical performance with no compromise on rate capability, the material (S2) is further blended with graphene and this composition indicates an excellent specific capacity of 296C/g with better rate capability than the S2. To investigate the real device performance, a supercapattery device (S3//activated carbon) is fabricated which exhibits a maximum specific capacity of 151.66C/g. The assembled supercapattery device yields a maximum specific energy of 33.8 Wh.kg-1 along with maximum specific power of 3962.13 W.kg-1. Moreover, the supercapattery device demonstrated an excellent capacity retention of 80% after continuous 3000 charge discharge cycles. To further investigate the performance evaluation a theoretical model proposed by Dunn and co-workers is applied to investigate the capacitive (non-faradaic) and diffusive (faradaic) contribution in the charge storage of the supercapattery. The diffusive contribution is found dominant at lower scan rates whereas the capacitive contribution is dominant at higher scan rates. This variation in the contribution is attributed to the interaction time of the electrolyte charge with the electrode material.

中文翻译：

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用于高性能超级电容器装置的氧化锶/聚苯胺/石墨烯复合材料的简便合成

摘要 在这项工作中，我们展示了用于混合储能应用的氧化锶-聚苯胺-石墨烯 (SrO-PANI-Gr) 三元复合材料的简便合成。合成材料的电化学性能最初以三电极组件为特征。这种纳米材料的比容量为 164C/g。为了提高原始 SrO (S1) 的电化学性能，它进一步与聚苯胺以 50/50% 的质量比物理混合，显示出 200C/g 的比容量和较低的倍率性能。为了在不影响倍率性能的情况下进一步提高电化学性能，材料 (S2) 进一步与石墨烯混合，该组合物具有 296C/g 的优异比容量，具有比 S2 更好的倍率性能。为了研究真实的装置性能，制造了一个超级电容器装置（S3//活性炭），其最大比容量为 151.66C/g。组装后的超级电容器装置产生的最大比能量为 33.8 Wh.kg-1，最大比功率为 3962.13 W.kg-1。此外，该超级电池装置在连续 3000 次充放电循环后表现出优异的容量保持率，可达 80%。为了进一步研究性能评估，Dunn 及其同事提出的理论模型被应用于研究超级电容器电荷存储中的电容（非法拉第）和扩散（法拉第）贡献。发现扩散贡献在较低扫描速率下占主导地位，而电容贡献在较高扫描速率下占主导地位。