title: Design and Tailoring of the 3D Macroporous Hydrous RuO2Hierarchical Architectures with a Hard-Template Method for High-Performance Supercapacitors.
abstract: In this work, RuO2honeycomb networks (RHCs) and hollow spherical structures (RHSs) were rationally designed and synthesized with modified-SiO2as a sacrificial template via two hydrothermal approaches. At a high current density of 20 A g-1, the two hierarchical porous RuO2·xH2O frameworks showed the specific capacitance as high as 628 and 597 F g-1; this is about 80% and 75% of the capacitance retention of 0.5 A g-1for RHCs and RHSs, respectively. Even after 4000 cycles at 5 A g-1, the RHCs and RHSs can still remain at 86% and 91% of their initial specific capacitances, respectively. These two hierarchical frameworks have a well-defined pathway that benefits for the transmission/diffusion of electrolyte and surface redox reactions. As a result, they exhibit good supercapacitor performance in both acid (H2SO4) and alkaline (KOH) electrolytes. As compared to RuO2bulk structure and similar RuO2counterpart reported in pseudocapacitors, the two hierarchical porous RuO2·xH2O frameworks have better energy storage capabilities, high-rate performance, and excellent cycling stability.
authors.affiliation: College of Chemistry and Molecular Engineering, Zhengzhou University , 100 Kexue Avenue, Zhengzhou 450001, People's Republic of China.
authors.forename: Zhikun
authors.initials: Z
authors.lastname: Peng
authors.affiliation: College of Chemistry and Molecular Engineering, Zhengzhou University , 100 Kexue Avenue, Zhengzhou 450001, People's Republic of China.
authors.forename: Xu
authors.initials: X
authors.lastname: Liu
authors.affiliation: College of Chemistry and Molecular Engineering, Zhengzhou University , 100 Kexue Avenue, Zhengzhou 450001, People's Republic of China.
authors.forename: Huan
authors.initials: H
authors.lastname: Meng
authors.affiliation: College of Chemistry and Molecular Engineering, Zhengzhou University , 100 Kexue Avenue, Zhengzhou 450001, People's Republic of China.
authors.forename: Zhongjun
authors.initials: Z
authors.lastname: Li
authors.affiliation: College of Chemistry and Molecular Engineering, Zhengzhou University , 100 Kexue Avenue, Zhengzhou 450001, People's Republic of China.
authors.forename: Baojun
authors.initials: B
authors.lastname: Li
authors.affiliation: College of Chemistry and Molecular Engineering, Zhengzhou University , 100 Kexue Avenue, Zhengzhou 450001, People's Republic of China.
authors.forename: Zhongyi
authors.identifier: http://orcid.org/0000-0003-1082-3433
authors.initials: Z
authors.lastname: Liu
authors.affiliation: College of Chemistry and Molecular Engineering, Zhengzhou University , 100 Kexue Avenue, Zhengzhou 450001, People's Republic of China.
authors.forename: Shouchang
authors.initials: S
authors.lastname: Liu
keywords: hard-template method; hollow spheres; honeycomb network; hydrous RuO2; supercapacitors