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Ceria for supercapacitors: Dopant prediction, and validation in a device
Sourav Ghosh, Kousika Anbalagan, U. Naveen Kumar, ,
Published in Elsevier
Volume: 21

Ceria, its Eu-based (Ce0.9Eu0.1O2), and Cr-based (Ce0.9Cr0.1O2) derivatives are investigated as supercapacitor-electrode material. In this work, doping standalone is used to enhance specific capacitance by 218% over pristine ceria. The Mott-Littleton method is used to predict the appropriate trivalent dopant (Cr in this case). The experimental study is found to be consistent with the prediction. Specifically, the XPS analysis indicates a higher vacancy concentration in the case of Ce0.9Cr0.1O2 vis-à-vis Ce0.9Eu0.1O2. The former material exhibits a maximum specific capacitance of 328 F g−1, which is 3 times that of undoped-ceria; the rate capability is reasonable even at 10 A g−1. A Swagelok cell consisting of Ce0.9Cr0.1O2@Ni-foam shows 100% capacitance retention even after 10,000 cycles. The cell exhibits a low steady-state leakage current of 17 μA with an overall leakage charge of 49.72 μAh. This study indicates that the Mott-Littleton approach can be used to guide superior dopant selection for supercapacitor application. © 2020

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JournalData powered by TypesetApplied Materials Today
PublisherData powered by TypesetElsevier
Open AccessNo