Abstract In this work, electrodes based on reduced graphene oxide for supercapacitors are prepared via a simple and environmental friendly electrochemical reduction method. The carbon fiber felts (CFFs) with a bunch of carbon fibers (CFs) sewn in them are used as substrates to load the graphene oxide (GO) suspension, and the GO sheets loaded on the CFFs are then reduced by constant voltage method to obtain the electrode (ErGO/CFF-CFs). By studying the effect of different ErGO loadings on the electrode's performance, we can find that when the mass loading is 2.5 mg cm−2, the assembled capacitor has the best overall performance in KOH/polyvinyl alcohol (PVA) gel electrolyte. According to the two-electrode system, the capacitance of the optimized electrode can reach 334.7 mF cm−2 (133.9 F g−1) at 2 mV s−1. The specific capacitance of the device can get 167.4 mF cm−2 (33.5 F g−1) at 2 mV s−1 and the energy density of the cell can reach 20.5 μWh cm−2 (4.1 Wh kg−1) at 0.2 W cm−2 (49.3 W kg−1). Additionally, after 10,000 cycles, the device's capacitance can still maintain 96.1% of the initial capacitance. Furthermore, the testing results show that the devices also exhibit excellent electrochemical performances when H2SO4/PVA is used as electrolyte. This method can be used as a convenient route to produce electrode with large amount of rGO load.

中文翻译：

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通过滴下电化学还原制备具有高度降低的氧化石墨烯负载的超级电容器电极

摘要 在这项工作中，通过一种简单且环保的电化学还原方法制备了基于还原氧化石墨烯的超级电容器电极。将其中缝有一束碳纤维 (CFs) 的碳纤维毡 (CFFs) 作为基材加载氧化石墨烯 (GO) 悬浮液，然后将加载在 CFFs 上的 GO 片材通过恒压法还原以获得电极（ErGO/CFF-CFs）。通过研究不同 ErGO 负载量对电极性能的影响，我们可以发现当质量负载为 2.5 mg cm-2 时，组装的电容器在 KOH/聚乙烯醇 (PVA) 凝胶电解质中具有最佳的整体性能。根据双电极系统，优化后的电极在 2 mV s-1 时的电容可以达到 334.7 mF cm-2 (133.9 F g-1)。该器件的比电容在 2 mV s-1 时可以达到 167.4 mF cm-2 (33.5 F g-1)，在 0.2 W 时电池的能量密度可以达到 20.5 μWh cm-2 (4.1 Wh kg-1) cm−2 (49.3 W kg−1)。此外，经过 10,000 次循环后，器件的电容仍可保持初始电容的 96.1%。此外，测试结果表明，当使用 H2SO4/PVA 作为电解质时，该器件还表现出优异的电化学性能。该方法可作为制备具有大量rGO负载的电极的便捷途径。测试结果表明，当使用 H2SO4/PVA 作为电解质时，该器件也表现出优异的电化学性能。该方法可作为制备具有大量rGO负载的电极的便捷途径。测试结果表明，当使用 H2SO4/PVA 作为电解质时，该器件也表现出优异的电化学性能。该方法可作为制备具有大量rGO负载的电极的便捷途径。