CuCo₂O₄ nanoneedle array with high stability for high performance asymmetric supercapacitors.

In addition, the curve of capacitance shows a decreasing trend, which is ascribe to the insufficient diffusion of OH − ions with increasing the scan rate. 33 The better electrochemical properties of CuCo 2 O 4 -12 electrode are attributed to the mesoporous nanoneedle array architecture, which provides a direct electron transport, facilitates the electrolyte penetration and reduces the interfacial resistance. 34,35 The above evidence implies that proper reactant concentration leads to better nanostructure and higher electrochemical performance.

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