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

Ting-Feng Yi; Li-Ying Qiu; Jie Mei; Si-Yu Qi; Ping Cui; Shaohua Luo; Yan-Rong Zhu; Ying Xie; Yan-Bing He

doi:10.1016/j.scib.2020.01.011

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

Sci Bull (Beijing). 2020 Apr 15;65(7):546-556. doi: 10.1016/j.scib.2020.01.011. Epub 2020 Jan 16.

Authors

Ting-Feng Yi¹, Li-Ying Qiu², Jie Mei³, Si-Yu Qi², Ping Cui³, Shaohua Luo⁴, Yan-Rong Zhu⁴, Ying Xie⁵, Yan-Bing He⁶

Affiliations

¹ School of Materials Science and Engineering, Northeastern University, Shenyang 110819, 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. Electronic address: tfyihit@163.com.
² School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China; School of Chemistry and Chemical Engineering, Anhui University of Technology, Maanshan 243002, China.
³ School of Chemistry and Chemical Engineering, Anhui University of Technology, Maanshan 243002, China.
⁴ School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao 066004, China.
⁵ Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China. Electronic address: xieying@hlju.edu.cn.
⁶ Shenzhen Geim Graphene Center, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China. Electronic address: he.yanbing@sz.tsinghua.edu.cn.

PMID: 36659186
DOI: 10.1016/j.scib.2020.01.011

Abstract

In this work, a rational design and construction of porous spherical NiO@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 NiO, and the hollow internal morphology combined with porous outer shell of NiO@NiMoO₄ and NiO@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 NiO, and then improves the electrochemical kinetics of NiO. At 20Ag^-1, the initial capacitances of NiO, NiMoO₄, NiO@NiMoO₄ and NiO@NiMoO₄@PPy are 456.0, 803.2, 764.4 and 941.6Fg^-1, respectively. After 10,000 cycles, the corresponding capacitances are 346.8, 510.8, 641.2 and 904.8Fg^-1, respectively. Especially, the initial capacitance of NiO@NiMoO₄@PPy is 850.2Fg^-1, and remains 655.2Fg^-1 with a high retention of 77.1% at 30Ag^-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@NiMoO₄ composite, resulting in a good cycling stability of these materials.

Keywords: Cycling stability; NiO; NiO@NiMoO(4)@PPy; Porous spherical structure; Supercapacitor.