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Design and development of NbTiVZr porous high entropy alloys for energy applications
Orientador(es)
Resumo(s)
Porous NbTiVZr refractory high entropy alloys have been developed by a novel method that is based on the
addition of yttrium to the base high entropy alloy and its subsequent removal by electrochemical dealloying
process. Microstructure and crystal structure characterization of as-cast alloys confirmed the segregation of
yttrium at interdendritic regions. Successful removal of yttrium from interdendritic region has been confirmed by
microstructure and crystal structure characterization of dealloyed samples. NbTiVZr foams with varying levels of
porosity were successfully developed and characterized. Electrochemical performance of the developed foams
was investigated by cyclic voltammetry (CV), galvanostatic charge discharge (GCD), and electrochemical
impedance spectroscopy (EIS). High areal capacitance of 82.66 mF cm 2 at scan rate of 2 mV s 1 was exhibited
by one of the developed electrodes. The electrode displayed capacitance retention of 104 % after 5000 cycles at
current density of 1 mA cm 2. The excellent electrochemical performance demonstrated by the NbTiVZr refractory
high entropy foams highlights their potential as suitable candidates for supercapacitor electrode.
Descrição
Palavras-chave
Electrode material Refractory high entropy alloys Selective dissolution Porous high entropy alloys Metallic foams Supercapacitors
Contexto Educativo
Citação
Editora
Elsevier Ltd.