title: Facile in situ synthesis of hierarchical porous Ni/Ni(OH)₂ hybrid sponges with excellent electrochemical energy-storage performances for supercapacitors.
abstract: Herein, we report the in situ growth of single-crystalline Ni(OH)2 nanoflakes on a Ni support by using facile hydrothermal processes. The as-prepared Ni/Ni(OH)2 sponges were well-characterized by using X-ray diffraction (XRD), SEM, TEM, and X-ray photoelectron spectroscopy (XPS) techniques. The results revealed that the nickel-skeleton-supported Ni(OH)2 rope-like aggregates were composed of numerous intercrossed single-crystal Ni(OH)2 flake-like units. The Ni/Ni(OH)2 hybrid sponges served as electrodes and displayed ultrahigh specific capacitance (SC=3247 F g(-1)) and excellent rate-capability performance, likely owing to fast electron and ion transport, sufficient Faradic redox reaction, and robust structural integrity of the Ni/Ni(OH)2 hybrid electrode. These results support the promising application of Ni(OH)2 nanoflakes as advanced pseudocapacitor materials.
authors.affiliation: Key Lab of Synthetic and Natural Functional, Molecule Chemistry of Ministry of Education and the College of Chemistry and Materials Science, Northwest University, Xi'an 710069 (P. R. China).
authors.forename: Wanren
authors.initials: W
authors.lastname: Wang
authors.forename: Wenhua
authors.initials: W
authors.lastname: Wang
authors.forename: Mengjiao
authors.initials: M
authors.lastname: Wang
authors.forename: Xiaohui
authors.initials: X
authors.lastname: Guo
keywords: hydrothermal synthesis; nickel; porous materials; supercapacitors; supramolecular chemistry