Capacitance response in an aqueous electrolyte of Nb2O5 nanochannel layers anodically grown in pure molten o-H3PO4
By Upadhyay, Kush K.; Cha, Gihoon; Hildebrand, Helga; Schmuki, Patrik; Silva, Teresa M.; Montemor, M. Fatima; Altomare, Marco
Published in Electrochimica Acta
2018
Abstract
Vertically aligned Nb2O5 nanochannel layers are grown on Nb metal substrates by self-organizing electrochemical anodization in a pure molten o-H3PO4 electrolyte. The capacitive behavior of these structures when used as negative electrodes is investigated in aqueous 1 M Na2SO4 electrolyte, in a potential range from ?0.2 to ?1.25 V vs. SCE. Surface chemistry, morphology and crystallographic features of the Nb2O5 nanochannel electrodes are tailored by adjusting the synthesis parameters, namely anodization time and crystallization temperature, which have a significant effect on the electrode performance. 8 ?m thick Nb2O5 nanochannel layers that are converted into orthorhombic phase by crystallization at 450
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