基于阴离子交换反应的NiMn-LDH电极电容性能提升研究

doi:10.19964/j.issn.1006-4990.2021-0223

摘要/Abstract

摘要：

采用一步水热法在泡沫镍网上原位生长镍锰基层状双氢氧化物（NiMn-LDH）纳米片阵列电极,并通过氢氧化钾溶液中浸泡的方式提升电极的容量。采用SEM、XRD、TEM和XPS等手段对浸泡前后的电极材料进行表征。结果表明,在浸泡前后NiMn-LDH电极的形貌没有变化,但在电极材料内部发生了明显的CO₃^2-和OH^-的交换反应,降低体积较大的CO₃^2-在LDH层间的分布数量,使层内空间成为OH^-的“蓄水池”,缩短了电荷存储过程中OH^-的迁移距离,因此电容性能有了明显提升。电化学测试结果表明,在5 mA/cm²电流密度下,电极的比电容从18.0 F/g增加至766.6 F/g（1.69 F/cm²）。将该电极与活性炭组装的全固态不对称超级电容器在功率密度为900 W/kg时,可呈现的能量密度为35.9 W·h/kg,并且器件的循环稳定性良好。

关键词: NiMn-LDH, 电极活化, 超级电容器, 阴离子交换反应

Abstract:

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 CO₃^2- and OH^- anions was occurred in the electrode materials obviously,which reduced the distribution quantity of large CO₃^2- 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.

中图分类号:

TQ138.13

梁群芳,许雪棠,王凡. 基于阴离子交换反应的NiMn-LDH电极电容性能提升研究[J]. 无机盐工业, 2022, 54(2): 38-44.

LIANG Qunfang,XU Xuetang,WANG Fan. Study on improvement of capacitance performance of NiMn-LDH electrode material by anions exchange[J]. Inorganic Chemicals Industry, 2022, 54(2): 38-44.

图/表 8

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正极	负极	能量密度/ （W·h·kg^-1）	功率密度/ （W·kg^-1）
a-NiMn LDH	AC	35.9	900.00
NiMn-LDH/NCF^[20]	NCF	34.1	350.10
NiMn-LDH/PC-1^[21]	RGO/CNT	18.6	225.03
NiMn-LDH/PPy/BC^[22]	Fe₃O₄@C/MWCNTs	29.8	299.00
rGO@NiMn-LDH@NF^[23]	AC	22.5	700.00
carbon-NiMn-LDH/NF^[24]	AC	37.7	378.13

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