Multi-element hydroxides grown on Ni-foam as binder-free electrodes for supercapacitor

Abstract

In this work we have studied a novel supercapacitor electrode made out of a mixed transition metal hydroxide directly grown on Ni foam The mixed transition metal hydroxide Co-Ni-Mn-Fe(OH)2 was synthesized using a one-pot synthesis involving hydrothermal treatment Fixed the precursor concentration hydrothermal time as well as hydrothermal temperature The result show that simply varying the ratio of the transition metal elements would lead to the formation of Co-Ni-Mn-Fe(OH)2 nanostructures having different morphologies The amount of the Cobalt element increased the retention improved Multi-element hydroxides enhance the capacitive performance and electrochemical performance due to its multi valence for Faradaic redox reaction Several material characterizations and electrochemical tests were performed Moreover we demonstrate that the novel electrode gives very excellent specific capacitance of 2 273 mF/cm2 and column efficiency after 5 000 cycles in three electrode system

Date of Award	2021
Original language	English
Supervisor	Jyh-Ming Ting (Supervisor)