Porous spherical NiO@NiMoO_4@PPy nanoarchitectures as advanced electrochemical pseudocapacitor materials
纳米结构的多孔球形NiO@NiMoO_4@PPy作为先进的电化学赝电容器材料
查看参考文献67篇
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文摘
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In this work, a rational design and construction of porous spherical NiO@NiMoO_4 wrapped with PPy was reported for the application of high-performance supercapacitor(SC).The results show that the NiMoO_4 modification changes the morphology of NiO, and the hollow internal morphology combined with porous outer shell of NiO@NiMoO_4 and NiO@NiMoO_4@PPy hybrids shows an increased specific surface area(SSA), and then promotes the transfer of ions and electrons.The shell of NiMoO_4 and PPy with high electronic conductivity decreases the charge-transfer reaction resistance of NiO, and then improves the electrochemical kinetics of NiO.At 20 A g~(-1), the initial capacitances of NiO, NiMoO_4, NiO@NiMoO_4 and NiO@NiMoO_4@PPy are 456.0, 803.2, 764.4 and 941.6 F g~(-1), respectively.After 10,000 cycles, the corresponding capacitances are 346.8, 510.8, 641.2 and 904.8 F g~(-1), respectively.Especially, the initial capacitance of NiO@NiMoO_4@PPy is 850.2 F g~(-1), and remains 655.2 F g~(-1) with a high retention of 77.1% at 30 A g~(-1) even after 30,000 cycles.The calculation result based on density function theory shows that the much stronger Mo-O bonds are crucial for stabilizing the NiO@NiMoO_4 composite, resulting in a good cycling stability of these materials. |
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其他语种文摘
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构建了一种PPy缠绕的多孔球形NiO@NiMoO_4材料,并应用于高性能的超级电容器.结果表明,NiO改性改变了NiMoO_4的形貌,NiO@NiMoO_4和NiO@NiMoO_4@ PPy均呈现一种内部中空和外壳多孔的形貌,并具有较大的比表面积,进而促进了离子和电荷的转移.NiMoO_4和PPy壳具有较高的电子电导率,降低了NiO的电荷转移电阻,进而提高了其电化学动力学性能.在电流密度为20 A/g时,NiO, NiMoO_4,NiO@NiMoO_4和NiO@NiMoO_4@PPy电极的初始放电比电容分别为456.0,803.2,764.4和941.6 F/g.在电流密度增大至30 A/g时,NiO@NiMoO_4@PPy电极的初始放电比电容为850.2 F/g, 30000次循环后比电容仍达到655.2 F/g,电容保有率为77.1%.第一性原理计算结果表明,更强的Mo-O有利于稳定NiO@NiMoO_4复物的结构,进而提高了其循环稳定性. |
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来源
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Science Bulletin
,2020,65(7):546-556 【核心库】
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DOI
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10.1016/j.scib.2020.01.011
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关键词
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NiO
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NiO@NiMoO_4@PPy
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Porous spherical structure
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Supercapacitor
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Cycling stability
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地址
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1.
School of Materials Science and Engineering, Northeastern University, Shenyang, 110819
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School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao, 066004
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Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province, Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province, Qinhuangdao, 066004
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School of Chemistry and Chemical Engineering, Anhui University of Technology, Maanshan, 243002
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School of Chemistry and Materials Science, Heilongjiang University, Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, Harbin, 150080
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Shenzhen Geim Graphene Center, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055
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语种
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英文 |
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文献类型
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研究性论文 |
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ISSN
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2095-9273 |
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学科
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一般工业技术;电工技术 |
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基金
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国家自然科学基金
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the Fundamental Research Funds for the Central Universities
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Key Program for International S&T Cooperation Projects of China
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文献收藏号
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CSCD:6691622
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