纳米多孔双金属氧化物NiCo2O4的制备及其电化学性能
Preparation and Electrochemical Performance of Nanoporous Bimetallic Oxide NiCo2O4
作者单位E-mail
周琦 兰州理工大学, 省部共建有色金属先进加工与再利用国家重点实验室, 兰州 730050 zhouxq301@sina.com 
李志洋 兰州理工大学, 省部共建有色金属先进加工与再利用国家重点实验室, 兰州 730050  
郑斌 兰州理工大学, 省部共建有色金属先进加工与再利用国家重点实验室, 兰州 730050  
摘要: 采用快速凝固与脱合金化相结合的方法制备纳米多孔Ni、Ni-Co合金,分别经腐蚀与退火获得纳米多孔NiO、NiCo2O4,采用XRD、SEM、TEM、N2吸附-脱附等对多孔NiO、NiCo2O4电极的物相、形貌结构、孔径分布进行表征,并通过循环伏安、恒电流充放电等方法测试多孔电极的电化学性能。结果表明,得到的纳米多孔NiO具有均匀的“泥裂”式结构,在1 A·g-1电流密度下比电容为375 F·g-1,当电流密度增加至20 A·g-1时的比容保持率为67.5%,在4 A·g-1电流密度下循环充放电1 000次,比容保持率为81.7%;NiCo2O4形成典型的开放式纳米多孔双连续结构,其在1 A·g-1电流密度下比电容为674 F·g-1,当电流密度增加至20 A·g-1,比容保持率达72.0%;在4 A·g-1电流密度下循环充放电1 000次,比容保持率达92.9%,双连续纳米多孔结构及其提供的机械稳定性,使得NiCo2O4表现出更为优异的超电容性能。
关键词: 快速凝固  脱合金化  双金属氧化物  电化学性能
基金项目: 国家自然科学基金(No.51661018)资助项目。
Abstract: Nanoporous Ni and Ni-Co alloys were prepared by a method of rapid quenching and de-alloying, and the samples were corroded and annealed to synthesize the nanoporous NiO and NiCo2O4 material respectively. The composition, morphology and microstructure of NiO and NiCo2O4 were analyzed by XRD, SEM, TEM and N2 adsorption-desorption. The electrochemical performance was investigated by cyclic voltammetry and galvanostatic charge-discharge. The results show that the porous NiO has a uniform "mud crack" structure. The specific capacitance of nanoporous NiO is 375 F·g-1 at current density of 1 A·g-1 and its retention ratio remains at 67.5% when the current density increases to 20 A·g-1. After galvanostatic charge-discharge 1 000 cycles at 4 A·g-1, the retention ratio of specific capacitance is 81.7%. The porous NiCo2O4 has a lamellar structure. The specific capacitance of nanoporous NiCo2O4 is 674 F·g-1 at current density of 1 A·g-1 and its retention ratio remains at 72.0% when the current density increases to 20 A·g-1. After galvanostatic charge-discharge 1 000 cycles at 4 A·g-1, the retention ratio of specific capacitance is 92.9%. NiCo2O4 shows superior supercapacitive performance because of the mechanical stability of the bicontinuous nanoporous structure.
Keywords: rapid quenching  de-alloying  metallic oxide  electrochemical performance
投稿时间:2018-01-21 修订日期:2018-03-26
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周琦,李志洋,郑斌.纳米多孔双金属氧化物NiCo2O4的制备及其电化学性能[J].无机化学学报,2018,34(6):1103-1109.
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