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Asymmetric Supercapacitor Based on Chemically Coupled Hybrid Material of Fe2O3‐Fe3O4 Heterostructure and Nitrogen‐Doped Reduced Graphene Oxide
ChemElectroChem ( IF 4 ) Pub Date : 2018-06-12 , DOI: 10.1002/celc.201800521
Sourav Mallick 1 , Partha Pratim Jana 2 , C. Retna Raj 1
Affiliation  

The synthesis of a novel chemically coupled hybrid material based on Fe2O3‐Fe3O4 heterostructure and nitrogen‐doped reduced graphene oxide (N‐rGO) for the development of high performance supercapacitor devices is demonstrated. The chemically coupled hybrid material is synthesized in a one‐pot method under hydrothermal condition, resulting in the formation of crystalline α‐Fe2O3 and poorly crystalline/amorphous Fe3O4. The Fe2O3‐Fe3O4 particles have an average size of 30–50 nm. Chemical integration of Fe2O3‐Fe3O4 with N‐rGO through Fe‐O−C bonds is achieved. The chemical coupling of N‐rGO with pseudocapacitive Fe2O3‐Fe3O4 enhances the overall performance of the composite. Two asymmetric supercapacitor devices using the hybrid material either as positive or negative electrode are fabricated. The supercapacitive behaviour is evaluated in terms of specific capacitance, energy density, power density and cycling stability, showing excellent performance. The asymmetric device based on hybrid material as the positive and activated carbon as the negative electrode, delivers a specific capacitance of 111.95 F g−1 at 0.8 A g−1 with an energy density of 44.93 Wh kg−1. The supercapacitor has excellent cycling stability with a capacitance retention of >92 % even after 10000 extensive charge‐discharge cycles. The all‐solid‐state asymmetric supercapacitor device is fabricated using gel electrolyte. Solid‐state devices connected in series successfully light up 29 LEDs.

中文翻译:

Fe2O3-Fe3O4异质结构与氮掺杂还原氧化石墨烯化学偶联杂化材料的不对称超级电容器

展示了一种基于Fe 2 O 3 -Fe 3 O 4异质结构和氮掺杂的还原氧化石墨烯(N-rGO)的新型化学偶联杂化材料的合成,用于开发高性能超级电容器器件。的化学偶联混合材料在水热条件下在一锅法合成,导致形成结晶的α-Fe的2 ö 3和不良结晶/无定形的Fe 3 Ò 4。Fe 2 O 3 -Fe 3 O 4颗粒的平均尺寸为30–50 nm。Fe 2 O的化学结合通过Fe-OC键实现带有N-rGO的3 -Fe 3 O 4。N-rGO与假电容Fe 2 O 3 -Fe 3 O 4的化学偶联增强了复合材料的整体性能。制造了使用混合材料作为正极或负极的两个不对称超级电容器器件。根据比电容,能量密度,功率密度和循环稳定性评估了超级电容性能,显示了出色的性能。基于混合材料作为正极和活性炭作为负极的不对称器件在0.8 A g -1时可提供111.95 F g -1的比电容具有44.93 Wh kg -1的能量密度。超级电容器具有出色的循环稳定性,即使经过10000次充放电循环,其电容保持率也> 92%。全固态不对称超级电容器器件是使用凝胶电解质制造的。串联的固态设备成功点亮了29个LED。
更新日期:2018-06-12
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