Hydrothermal synthesis of a graphene‐based composite enabling the fabrication of a current collector‐free microsupercapacitor with improved energy storage performance

Adnane Bouzina, René Meng, Françoise Pillier, Hubert Perrot, O. Sel, Catherine Debiemme-Chouvy
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Abstract

Herein, the development and the characterization of an all‐solid state symmetrical and current collector‐free microsupercapacitor based on a new reduced graphene oxide‐polydopamine (rGO‐PDA) composite are reported. The rGO‐PDA composite is synthesized by a facile, eco‐friendly and scalable hydrothermal approach in the presence of dopamine which can not only contribute to the oxygen functional groups removal from graphene oxide but also polymerize onto the rGO sheets reducing their restacking and improving the wettability of the electrode. The optimized rGO‐PDA composite material exhibits excellent capacitance and cycling stability as well as an improved rate capability compared to the pristine rGO in Na2SO4 solution. This performance enhancement can be linked to the higher transfer kinetic and lower transfer resistance values of the ions involved in the charge storage process of rGO‐PDA, as determined by ac‐electrogravimetry. Furthermore, an all‐solid‐state microsupercapacitor was prepared employing the optimized rGO‐PDA composite as electrode material. Interdigitated electrodes were obtained thanks to a CO2 laser and a Na2SO4/PVA hydrogel was employed, no current collector was used. This device achieves a noteworthy energy density of 6.2mWh·cm‐3 at a power density of 0.22W·cm‐3. Moreover, it exhibits exceptional cycling stability, retaining 104% of its initial capacity even after undergoing 10,000 cycles at 2V·s‐1.

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水热法合成石墨烯基复合材料,从而制造出具有更佳储能性能的无集流器微型超级电容器
本文报告了基于新型还原氧化石墨烯-多巴胺(rGO-PDA)复合材料的全固态对称无集流器微型超级电容器的开发和表征。多巴胺不仅能促进氧官能团从氧化石墨烯中脱除,还能聚合到 rGO 片上,减少它们的重新堆积,改善电极的润湿性。与 Na2SO4 溶液中的原始 rGO 相比,优化后的 rGO-PDA 复合材料表现出优异的电容性和循环稳定性,并提高了速率能力。这种性能的提高与 rGO-PDA 在电荷存储过程中离子的较高转移动力学值和较低转移电阻值有关,这是由交流电重分析法确定的。此外,采用优化的 rGO-PDA 复合材料作为电极材料制备了全固态微型超级电容器。利用 CO2 激光和 Na2SO4/PVA 水凝胶获得了相互咬合的电极,没有使用集流器。在功率密度为 0.22W-cm-3 的情况下,该装置实现了 6.2mWh-cm-3 的显著能量密度。此外,它还表现出卓越的循环稳定性,即使在 2V-s-1 下循环 10,000 次,仍能保持 104% 的初始容量。
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