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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

Yi Tingfeng ^1,2,3 ^* Qiu Liying ^1,2 Mei Jie ⁴ Qi Siyu ^1,2 Cui Ping ⁴ Luo Shaohua ² Zhu Yanrong ² Xie Ying ⁵ ^* He Yanbing ⁶ ^*

文摘	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.
其他语种文摘	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.
来源	Science Bulletin ,2020,65(7):546-556 【核心库】
DOI	10.1016/j.scib.2020.01.011
关键词	NiO ; NiO@NiMoO_4@PPy ; Porous spherical structure ; Supercapacitor ; Cycling stability
地址	1. School of Materials Science and Engineering, Northeastern University, Shenyang, 110819 2. School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao, 066004 3. Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province, Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province, Qinhuangdao, 066004 4. School of Chemistry and Chemical Engineering, Anhui University of Technology, Maanshan, 243002 5. School of Chemistry and Materials Science, Heilongjiang University, Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, Harbin, 150080 6. Shenzhen Geim Graphene Center, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055
语种	英文
文献类型	研究性论文
ISSN	2095-9273
学科	一般工业技术;电工技术
基金	国家自然科学基金 ; the Fundamental Research Funds for the Central Universities ; Key Program for International S&T Cooperation Projects of China
文献收藏号	CSCD:6691622

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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

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