Cost-effective solutions to energy storage system development

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Spring 2021


For a nation to move closer to clean energy uses in daily life, solar and wind energy must be stored in electrochemical energy systems. Renewable energy’s intermittent nature calls for batteries and supercapacitors highly efficient in converting and storing energy. In this work, low-cost nanostructured metal oxides were obtained via a facile hydrothermal process for their applications in supercapacitor. Cobalt oxide was doped with iron; they have relatively similar atomic radii with similar electronegativity properties. Previous reports have mentioned the synergistic effect of Co and Fe in various electrochemical applications. This work studied samples obtained by changing the elemental compositions of iron-cobalt FexCo3-xO4 with x = 0, 0.2, 0.4, 0.6, 0.8, and 1. It was observed that Fe0.2Co2.8O4 showed the best performance in the capacitive test by delivering 3.17 F/cm2 at a 2 mV/s scan rate. We speculate that a trend can be seen in which iron dopant amount largely governs the sample’s electrochemical properties. Such techniques can be applied to optimize materials for cost-effective energy solutions.


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