Interrogation of Electrochemical Performance of Reduced Graphene Oxide/Metal‐organic Framework Hybrid for Asymmetric Supercabattery Application,Electroanalysis

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Interrogation of Electrochemical Performance of Reduced Graphene Oxide/Metal‐organic Framework Hybrid for Asymmetric Supercabattery Application
Electroanalysis ( IF 2.7 ) Pub Date : 2020-09-07 , DOI: 10.1002/elan.202060303
Daniel M. Teffu ₁ , Mogwasha D. Makhafola ₁ , Miranda M. Ndipingwi ₂ , Edwin Makhado ₁ , Mpitloane J. Hato ₁ , Emmanuel I. Iwuoha ₂ , Kwena D. Modibane ₁ , Katlego Makgopa ₃

Affiliation

Large scale energy storage system with low cost, high power, and long cycle life is crucial for addressing the energy crisis, especially when integrated with renewable energy resources. To realize grid‐scale applications of the energy storage devices, there remain several key issues including the development of low‐cost, high‐performance materials that are environmentally friendly. This study explores the synergic contribution of the reduced graphene oxide (rGO) on metal organic framework (MOF) as positive electrode for asymmetric supercabattery. The structural elucidation of the synthesised hybrid material and its precursors were characterised using XRD, FTIR, TGA, SEM and TEM. The electrochemical analysis of the synthesised hybrid material and its precursors was achieved using CV, GCD and EIS. The electrochemical behaviour of NF‐rGO/MOF hybrid obtained from the three‐electrode system exhibited a battery‐type behaviour and accomplished an improved specific capacity of 459.0 Cg⁻¹ at the current density of 1.5 A g⁻¹. Furthermore, the two‐electrode system fabricated in an asymmetric configuration made of NF‐rGO/MOF hybrid as the positive electrode and activated carbon (AC) as the negative electrode studied in 3.0 M KOH electrolyte, exhibited specific capacity of about 48.81 Cg⁻¹ at the current density of 0.4 A g⁻¹, the corresponding maximum energy density of 11.0 Wh kg⁻¹ and the maximum power density of 640.45 W kg⁻¹. The cycling stability of the rGO/MOF hybrid asymmetric device displayed 70 % capacity retention after 2000 cycles.

中文翻译：

还原石墨烯/金属-有机骨架杂化材料在不对称超级电池中的电化学性能研究

低成本，高功率，长寿命的大型储能系统对于解决能源危机至关重要，特别是与可再生能源整合时。为了实现储能设备的网格规模应用，仍然存在几个关键问题，包括开发环保的低成本，高性能材料。这项研究探讨了还原的氧化石墨烯（rGO）对金属有机骨架（MOF）作为不对称超级电池正极的协同作用。使用XRD，FTIR，TGA，SEM和TEM表征了合成杂化材料及其前体的结构。使用CV，GCD和EIS对合成的杂化材料及其前体进行了电化学分析。^-1在1.5 A G的电流密度^-1。此外，在3.0 M KOH电解质中研究了以NF-rGO / MOF混合材料为正极，活性炭（AC）为负极的非对称构造的两电极系统，其比容量约为48.81 Cg ^-1在0.4 A g ^-1的电流密度下，相应的最大能量密度为11.0 Wh kg ^-1和最大功率密度为640.45 W kg ^-1。rGO / MOF混合不对称设备的循环稳定性在2000次循环后显示出70％的容量保持率。

更新日期：2020-09-07

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