Oxygen reduction and oxygen evolution are the key electrochemical reactions in fuel cells and metal-air batteries.In order to promote the kinetic process of oxygen reduction and oxygen evolution reaction,graphite oxide(GO) nanosheets with a negative charge on the surface and cobalt-nickel nanosheets with a positive charge on the surface were exfoliate for preparing GO-supported cobalt-nickel(CoNi) layered double hydroxide nanosheet with ordered structure.Specially,the GO-supported CoNi layered double hydroxide nanosheet can transform to CoNi transition metal oxide with spinel structure at a certain condition by calcination.The microstructure and composition of the prepared materials was studied by SEM combined with EDS and XRD characterization.The catalytical performance of the prepared materials for oxygen reduction and oxygen evolution reaction was studied by electrochemical tests.The results shown that the GO-supported CoNi dihydroxy hydroxide nanosheets prepared by self-assembly had good oxygen reduction catalytic activity,and the limiting current density was comparable to the commercial carbon-supported platinum,which was far more than the corresponding material synthesized via traditional hydrothermal method.This improvement in catalytic activity was mainly due to the highly ordered structure of the materials prepared by the self-assembly method,the advantages of the layered structure of CoNi dihydroxy hydroxide,and the advantage of the GO supporter.At the same time,the CoNi oxide with spinel structure obtained from the transformation showed good catalytic performance for the oxygen evolution reaction.
Yu Haifeng, Wang Fang, Gao Yahui, Wang Zhimou, Liang Pengju
. Preparation and of CoNi electrocatalyst loading on GO by self-assembly[J]. New Chemical Materials, 2021
, 49(8)
: 125
-131
.
DOI: 10.19817/j.cnki.issn 1006-3536.2021.08.026
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