Inorganic Chemicals Industry >
Study on improvement of capacitance performance of NiMn-LDH electrode material by anions exchange
Received date: 2021-04-06
Online published: 2022-03-14
NiMn-LDH nanosheet arrays on Ni foam were synthesized via one-step hydrothermal method,and the capacitive performance was enhanced by soaking the nanoarrays on KOH solution.The as-obtained electrode before and after the soaking process were characterized by SEM,XRD,TEM and XPS technologies.The results showed that the morphology of NiMn-LDH electrode did not change before and after immersion,but anion exchange reaction between CO32- and OH- anions was occurred in the electrode materials obviously,which reduced the distribution quantity of large CO32- between LDH layers,made the space in the layer become the“reservoir”of OH-,and reduced the migration distance of OH- in the charge storage process.Therefore,the capacitance performance had been significantly improved.The electrochemical test results showed that the speci-fic capacitance of the electrode increased from 18.0 F/g to 766.6 F/g（1.69 F/cm2） at the current density of 5 mA/cm2.When the power density of the all solid-state asymmetric supercapacitor assembled with the electrode and activated carbon was 900 W/kg,the displayed energy density was 35.9 W·h/kg,and the cycle stability of the device was good.
Key words： NiMn-LDH; electrode activation; supercapacitor; anions exchange reaction.
Qunfang LIANG , Xuetang XU , Fan WANG . Study on improvement of capacitance performance of NiMn-LDH electrode material by anions exchange[J]. Inorganic Chemicals Industry, 2022 , 54(2) : 38 -44 . DOI: 10.19964/j.issn.1006-4990.2021-0223
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