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Heterojunction ?-Co(OH)2/?-Ni(OH)2 nanorods arrays on Ni foam with high utilization rate and excellent structure stability for high-performance supercapacitor.

ABSTRACT: The practical implementation of supercapacitors is hindered by low utilization and poor structural stability of electrode materials. Herein, to surmount these critical challenges, a three-dimensional hierarchical ?-Co(OH)2/?-Ni(OH)2 heterojunction nanorods are built in situ on Ni foam through a mild two-step growth reaction. The unique lamellar crystal structure and abundant intercalated anions of ?-M(OH)2 (M?=?Co or Ni) and the ideal electronic conductivity of ?-Co(OH)2 construct numerous cross-linked ion and electron transport paths in heterojunction nanorods. The deformation stresses exerted by ?-Co(OH)2 and ?-Ni(OH)2 on each other guarantee the excellent structural stability of this heterojunction nanorods. Using nickel foam with a three-dimensional network conductive framework as the template ensures the rapidly transfer of electrons between this heterojunction nanorods and current collector. Three-dimensional hierarchical structure of ?-Co(OH)2/?-Ni(OH)2 heterojunction nanorods provides a large liquid interface area. These result together in the high utilization rate and excellent structure stability of the ?-Co(OH)2/?-Ni(OH)2 heterojunction nanorods. And the capacitance retention rate is up to 93.4% at 1?A?g-1 from three-electrode system to two-electrode system. The ?-Co(OH)2/?-Ni(OH)2//AC device also present a long cycle life (the capacitance retention rate is 123.6% at 5?A?g-1 for 10000 cycles), a high specific capacitance (207.2?F?g-1 at 1?A?g-1), and high energy density and power density (72.6?Wh?kg-1 at 196.4?W?kg-1 and 40.9?Wh?kg-1 at 3491.8?W?kg-1), exhibiting a fascinating potential for supercapacitor in large-scale applications.

SUBMITTER: Zhou S 

PROVIDER: S-EPMC6726609 | biostudies-literature | 2019 Sep

REPOSITORIES: biostudies-literature

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Heterojunction α-Co(OH)<sub>2</sub>/α-Ni(OH)<sub>2</sub> nanorods arrays on Ni foam with high utilization rate and excellent structure stability for high-performance supercapacitor.

Zhou Shaojie S   Wei Wutao W   Zhang Yingying Y   Cui Shizhong S   Chen Weihua W   Mi Liwei L  

Scientific reports 20190904 1

The practical implementation of supercapacitors is hindered by low utilization and poor structural stability of electrode materials. Herein, to surmount these critical challenges, a three-dimensional hierarchical α-Co(OH)<sub>2</sub>/α-Ni(OH)<sub>2</sub> heterojunction nanorods are built in situ on Ni foam through a mild two-step growth reaction. The unique lamellar crystal structure and abundant intercalated anions of α-M(OH)<sub>2</sub> (M = Co or Ni) and the ideal electronic conductivity of α  ...[more]

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