Hierarchical metal oxide nanostructures emerge as the promising candidate for energy storage application due to their huge surface area, porosity and interconnected electron transport pathways. In this article, we report for the first time the electrochemical properties of very uniform and efficient thorn apple fruit like nickel cobaltite nanostructures of different forms and investigated the structure-property relationship. NiCo₂O₄ is directly grown over the Ni-foam by a cheap, scalable and facile hydrothermal technique and characterized for structural, morphological and porous characteristics. Electrochemical properties are determined by conducting cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance analysis. The non-annealed NiCo₂O₄.nH₂O possesses mesoporous nanostructure with pore size centering between 3 and 10 nm which being the optimum size enables the material to exhibit best electrochemical properties. Specific capacity reaches as high as 670C/g for NiCo₂O₄.nH₂O at 0.5 A/g current density. Asymmetric supercapacitor device is fabricated by combining binder free cathode and activated carbon and investigated for device performance. Specific capacity, energy and power density as high as 129C/g, 55.9 Wh/kg and 751.4 W/kg are achieved at 0.5A/g current density with the fabricated device. The device exhibits 98% retention of specific capacity after 10,000 cycles demonstrating its potential for high energy durable supercapacitor application.

分层的金属氧化物纳米结构因其巨大的表面积，孔隙率和相互连接的电子传输路径而成为储能应用的有希望的候选者。在本文中，我们首次报道了非常均匀和高效的刺苹果果实（如不同形式的镍钴矿纳米结构）的电化学性质，并研究了其结构与性质的关系。NiCo ₂ O ₄通过廉价，可扩展且易于使用的水热技术直接在Ni泡沫上生长，并具有结构，形态和多孔特性。电化学性能通过循环伏安法，恒电流充放电和电化学阻抗分析来确定。非退火NiCo ₂O ₄ .nH ₂ O具有介孔纳米结构，其孔径在3到10 nm之间，这是最佳尺寸，可以使材料表现出最佳的电化学性能。NiCo ₂ O ₄ .nH _2的比容量高达670C / gO在0.5 A / g的电流密度下。通过将无粘结剂的阴极和活性炭相结合来制造不对称超级电容器器件，并研究其性能。所制造的器件在0.5A / g的电流密度下可实现高达129C / g，55.9 Wh / kg和751.4 W / kg的比容量，能量和功率密度。该器件在10,000次循环后仍具有98％的比容量保持率，证明了其在高能耐久超级电容器应用中的潜力。