Abstract
The capacity of pseudocapacitors can exceed that of traditional electrostatic or electric double-layer capacitors, and they can also provide faster power delivery and longer cycling stability than lithium-ion batteries. In this work, we investigate the effect of solvent on the morphological change of NiCo hydroxides during hydrothermal synthesis according to mixture ratio of ethanol and water. We elucidate the phase of NiCo-layered double hydroxide (LDH) transformed to NiCo-carbonate hydroxide (CH) and morphological evolution of nanosheets to nanowire structures by adding ethanol in solution. The experimental results confirm that an increase of carbonate anions caused the phase and morphology of NiCo-LDH to transform into NiCo-CH. The hierarchically structured electrodes achieve excellent electrochemical performance, with a capacitance of 1,298 Fg-1 due to their structural benefits, which provide effective electrolyte transport, electron transfer, and active site accessibility. Figure 1
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