Redox‐Active Organic Sodium Anthraquinone‐2‐Sulfonate (AQS) Anchored on Reduced Graphene Oxide for High‐Performance Supercapacitors,Advanced Energy Materials

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Redox‐Active Organic Sodium Anthraquinone‐2‐Sulfonate (AQS) Anchored on Reduced Graphene Oxide for High‐Performance Supercapacitors
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2018-09-27 , DOI: 10.1002/aenm.201802088
Ruiying Shi _{1,

2} , Cuiping Han ₃ , Huan Duan ₁ , Lei Xu _{1,

2} , Dong Zhou ₄ , Hongfei Li ₁ , Junqin Li ₃ , Feiyu Kang _{1,

2} , Baohua Li ₁ , Guoxiu Wang ₄

Affiliation

Redox active organic quinones are potentially low cost, sustainable, and high‐energy pseudocapacitive materials due to their fast and reversible redox reactivity. However, their electrically insulating nature prevents any practical application. Herein, for the first time, sodium anthraquinone‐2‐sulfonate (AQS) is examined as an organic redox‐active compound and highly conductive graphene nanosheets are incorporated to enhance the electronic conductivity. The SO₃⁻ functional group of AQS offers excellent hydrophilicity, which promotes the molecular level binding of AQS with reduced graphene oxide (rGO) and leads to a 3D interconnected xerogel (AQS@rGO). The composite exhibits a high specific capacitance of 567.1 F g⁻¹ at 1 A g⁻¹ with a stable capacity retention of 89.1% over 10 000 cycles at 10 A g⁻¹. More importantly, the optimized composite maintains a high capacitance of 315.1 F g⁻¹ even at 30 A g⁻¹ due to the high pseudocapacitance of AQS and the capacitive contribution of rGO. First‐principles calculations further elucidate that AQS offers strong adhesion to rGO sheets with the formation of a space‐charge layer, which is favorable for the pseudocapacitance of AQS. This work opens a new avenue for developing high‐performance supercapacitors though rational combination of redox organic molecules with highly conductive graphene.

中文翻译：

用于高性能超级电容器的氧化还原活性有机蒽醌-2-磺酸钠（AQS）固定在还原的氧化石墨烯上

氧化还原活性有机醌由于其快速和可逆的氧化还原反应性而潜在地是低成本，可持续和高能量的假电容材料。然而，它们的电绝缘性质阻止了任何实际应用。在此，首次将蒽醌-2-磺酸钠（AQS）作为一种有机氧化还原活性化合物进行了研究，并加入了高导电性石墨烯纳米片以增强电子导电性。所述 SO ₃^- AQS提供优异的亲水性，这促进了在分子水平上具有减小的氧化石墨烯（RGO）AQS的结合和引线到3D的官能团相互连接的干凝胶（AQS @ RGO）。该复合材料在1 A g ^-1下表现出567.1 F g ^-1的高比电容在10 A g ^-1下的10000次循环中具有89.1％的稳定容量保持率。更重要的是，由于AQS的高假电容和rGO的电容作用，即使在30 A g ^-1时，优化的复合材料仍可保持315.1 F g ^-1的高电容。第一性原理的计算进一步阐明了AQS通过形成空间电荷层而对rGO薄板具有很强的附着力，这对于AQS的准电容是有利的。通过氧化还原有机分子与高导电石墨烯的合理结合，这项工作为开发高性能超级电容器开辟了一条新途径。

更新日期：2018-09-27

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