Porous spherical NiO@NiMoO4@PPy nanoarchitectures as advanced electrochemical pseudocapacitor materials  

纳米结构的多孔球形NiO@NiMoO4@PPy作为先进的电化学赝电容器材料

作　　者：Ting-Feng Yi Li-Ying Qiu Jie Mei Si-Yu Qi Ping Cui Shaohua Luo Yan-Rong Zhu Ying Xie Yan-Bing He 伊廷锋;仇立英;梅杰;齐思雨;崔平;罗绍华;朱彦荣;谢颖;贺艳兵(School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China;Key Laboratory of Functional Inorganic Material Chemistry,Ministry of Education,School of Chemistry and Materials Science,Heilongjiang University,Harbin 150080,China;Shenzhen Geim Graphene Center,Tsinghua Shenzhen International Graduate School,Tsinghua University,Shenzhen 518055,China;School of Chemistry and Chemical Engineering,Anhui University of Technology,Maanshan 243002,China;School of Resources and Materials,Northeastern University at Qinhuangdao,Qinhuangdao 066004,China;Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province,Qinhuangdao 066004,China)

机构地区：[1]School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China [2]Key Laboratory of Functional Inorganic Material Chemistry,Ministry of Education,School of Chemistry and Materials Science,Heilongjiang University,Harbin 150080,China [3]Shenzhen Geim Graphene Center,Tsinghua Shenzhen International Graduate School,Tsinghua University,Shenzhen 518055,China [4]School of Chemistry and Chemical Engineering,Anhui University of Technology,Maanshan 243002,China [5]School of Resources and Materials,Northeastern University at Qinhuangdao,Qinhuangdao 066004,China [6]Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province,Qinhuangdao 066004,China

出　　处：《Science Bulletin》2020年第7期546-556,M0004,共12页科学通报（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(U1960107,21773060,51771046,and 51674068);the Fundamental Research Funds for the Central Universities(N182304014);Key Program for International S&T Cooperation Projects of China(2017YFE0124300).

摘　　要：In this work, a rational design and construction of porous spherical Ni O@NiMoO4 wrapped with PPy was reported for the application of high-performance supercapacitor(SC). The results show that the NiMoO4 modification changes the morphology of Ni O, and the hollow internal morphology combined with porous outer shell of Ni O@NiMoO4 and Ni O@NiMoO4@PPy hybrids shows an increased specific surface area(SSA), and then promotes the transfer of ions and electrons. The shell of NiMoO4 and PPy with high electronic conductivity decreases the charge-transfer reaction resistance of Ni O, and then improves the electrochemical kinetics of Ni O. At 20 Ag^-1, the initial capacitances of Ni O, NiMoO4, Ni O@NiMoO4 and Ni O@NiMoO4@PPy are 456.0, 803.2, 764.4 and 941.6 Fg^-1, respectively. After 10,000 cycles, the corresponding capacitances are 346.8, 510.8, 641.2 and 904.8 Fg^-1, respectively. Especially, the initial capacitance of Ni O@NiMoO4@PPy is 850.2 Fg^-1, and remains 655.2 Fg^-1 with a high retention of 77.1% at30 Ag^-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 Ni O@NiMoO4 composite, resulting in a good cycling stability of these materials.构建了一种PPy缠绕的多孔球形NiO@NiMoO4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NiMoO4的形貌,NiO@NiMoO4和NiO@NiMoO4@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.NiMoO4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20A/g时,NiO,NiMoO4,NiO@NiMoO4和NiO@NiMoO4@PPy电极的初始放电比电容分别为456.0,803.2,764.4和941.6F/g.在电流密度增大至30A/g时,NiO@NiMoO4@PPy电极的初始放电比电容为850.2F/g,30000次循环后比电容仍达到655.2F/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@NiMoO4复物的结构,进而提高了其循环稳定性.

关 键 词：NIO NiO@NiMoO4@PPy Porous spherical structure Supercapacitor Cycling stability 

分 类 号：TM53[电气工程—电器] TB33[一般工业技术—材料科学与工程]