Journal of Advanced Research ( IF 11.4 ) Pub Date : 2022-10-21 , DOI: 10.1016/j.jare.2022.10.009 Sajid Ali Ansari 1 , Nazish Parveen 2 , Mohd Al Saleh Al-Othoum 1 , Mohammad Omaish Ansari 3
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Introduction
The energy industry has been challenged by the current high population and high energy consumption, forcing the development of effective and efficient supercapacitor devices. The crucial issues until now have been high production cost, deprived cyclic stability, and squat energy density. To resolve these problems, various approaches have been taken, such as the development of long-life electrode materials with high capacity, rapid charging, and slow discharging to overcome poor life cycle stability.
Objectives
In the present work we focus on fabricating cost-effective unique-morphology, high-surface-area alpha-Co(OH)2 for application in an aqueous-electrolyte symmetric supercapacitor.
Methods
In this study, hierarchical nanoflakes assembled in three-dimensional (3D) flower-shaped cobalt hydroxide (HN-3DF-α-Co(OH)2) electrode were synthesized using the solvothermal method with sodium dodecylbenzene sulfonate (SDBS) and methanol as solvents. Spectroscopic and microscopic techniques were used to characterize fabricated HN-3DF-Co(OH)2, which revealed that the materials electrode exhibited the alpha phase with a hierarchical flower-like structure. A half-cell electrochemical assembly (three-electrode assemble cell) and symmetric full cell (two-electrode assemble cell) were examined in an aqueous electrolyte.
Results
In three-electrode assembly cells, HN-3DF-α-Co(OH)2 exhibited 719.5 Fg−1 specific capacitance (Csp) at 1 Ag−1 with excellent cyclic retention stability of approximately 88% after 3000 cycles. In two-electrode symmetric supercapacitive systems, HN-3DF-α-Co(OH)2 achieved a maximum Csp of 70.3 Fg−1 at 0.4 Ag−1 with the highest energy density of approximately 6.25 Wh/kg at a power density of 328.94 W/kg. The fabricated two-electrode assembly cell with the HN-3DF-α-Co(OH)2 electrode retained cyclic stability of approximately 85% after 5000 repeated charge and discharge cycles.
Conclusion
Solvothermally-synthesized, optimized HN-3DF-α-Co(OH)2 showed outstanding electrochemical performance results in three- and two-electrode systems. This unique aqueous symmetric supercapacitor can be used to design cost-effective symmetric capacitors based on metal hydroxide.
中文翻译：
内-外 OH- 侵入涉及分层纳米片组装三维花状 α-Co(OH)2 的制造，用于高性能水性对称超级电容器应用
介绍
能源行业受到当前高人口和高能源消耗的挑战，迫使开发有效且高效的超级电容器装置。迄今为止的关键问题是生产成本高、循环稳定性差和能量密度低。为了解决这些问题，人们采取了多种方法，例如开发具有高容量、快速充电和慢放电的长寿命电极材料，以克服较差的生命周期稳定性。
目标
在目前的工作中，我们专注于制造具有成本效益的独特形态、高表面积的α-Co(OH) 2，用于水电解质对称超级电容器。
方法
本研究以十二烷基苯磺酸钠（SDBS）和甲醇为溶剂，采用溶剂热法合成了在三维（3D）花形氢氧化钴（HN-3DF-α-Co(OH) 2 ）电极中组装的多级纳米片。 。使用光谱和显微技术对制备的 HN-3DF-Co(OH) 2进行表征，结果表明该材料电极呈现出具有分层花状结构的 α 相。在水性电解质中检查半电池电化学组件（三电极组装电池）和对称全电池（两电极组装电池）。
结果
在三电极组装电池中，HN-3DF-α-Co(OH) 2在1 Ag -1下表现出719.5 Fg -1比电容(C sp ) ，并且在3000次循环后具有约88%的优异循环保留稳定性。在两电极对称超级电容系统中，HN-3DF-α-Co(OH) 2在0.4 Ag -1下实现了70.3 Fg -1的最大C sp，在功率密度为6.25 Wh/kg时，最高能量密度约为6.25 Wh/kg。 328.94 瓦/公斤。使用HN-3DF-α-Co(OH) 2电极制造的两电极组装电池在5000次重复充电和放电循环后保持了约85%的循环稳定性。
结论
溶剂热合成、优化的 HN-3DF-α-Co(OH) 2在三电极和两电极系统中表现出出色的电化学性能。这种独特的水性对称超级电容器可用于设计基于金属氢氧化物的经济高效的对称电容器。
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