Chanho Shin, Eun Hye Lee, Hyeong Ju Eun, Jinwook Jung, Jong H. Kim, Tse Nga Ng
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引用次数: 0
摘要
聚苯胺(PANI)的氧化还原活动受到过新苯胺盐(PS)状态不稳定的阻碍,PS 会降解成低聚苯胺。在这项工作中,我们研究了如何使用原生添加剂来减轻容量衰减并提高 PANI 在非水电解质中的利用率。原生添加剂丙二醇具有氢键功能,可稳定 PS PANI 并促进可逆氧化还原反应,从而提高容量并延长循环寿命,适用于金属离子超级电容器。在 PANI-zinc 器件中使用这种原生非水电解质,可使能量密度达到 255 Wh kg-1,功率密度为 1.8 kW kg-1,循环寿命长达 3,850 次充放电循环。在 6.5 mA cm-2 的高电流密度下,PANI 的容量达到 257 mAh g-1,相当于其理论容量的 87%,显示了原生添加剂在提高电化学超级电容器容量和循环寿命方面的有效性。
Protic Stabilization Engenders High Energy Density and Long Cycle Life in Polyaniline–Zinc Supercapacitors
The redox activities of polyaniline (PANI) are hindered by the instability of pernigraniline salt (PS) state which degrades into oligo-aniline. In this work, the use of protic additives is examined to mitigate capacity fading and increase utilization of PANI in nonaqueous electrolytes. The protic additive propylene glycol, with its hydrogen-bonding capabilities, stabilizes the PS PANI and promotes reversible redox reactions, facilitating high capacity and an extended cycle lifetime for applications in metal ion supercapacitors. The use of this protic nonaqueous electrolyte in a PANI–zinc device results in an energy density of 255 Wh kg−1 at a power density of 1.8 kW kg−1 and a robust cycle lifetime of 3,850 charge/discharge cycles. The PANI at a high current density of 6.5 mA cm−2 reaches a capacity of 257 mAh g−1, equivalent to 87% of the its theoretical capacity, showcasing the effectiveness of the protic additive in improving both capacity and cycle life in electrochemical supercapacitors.
期刊介绍:
Small Science is a premium multidisciplinary open access journal dedicated to publishing impactful research from all areas of nanoscience and nanotechnology. It features interdisciplinary original research and focused review articles on relevant topics. The journal covers design, characterization, mechanism, technology, and application of micro-/nanoscale structures and systems in various fields including physics, chemistry, materials science, engineering, environmental science, life science, biology, and medicine. It welcomes innovative interdisciplinary research and its readership includes professionals from academia and industry in fields such as chemistry, physics, materials science, biology, engineering, and environmental and analytical science. Small Science is indexed and abstracted in CAS, DOAJ, Clarivate Analytics, ProQuest Central, Publicly Available Content Database, Science Database, SCOPUS, and Web of Science.