A Ni-P@NiCo LDH core–shell nanorod-decorated nickel foam with enhanced areal specific capacitance for high-performance supercapacitors. Issue 30 (21st July 2017)

• Record Type: Journal Article
• Authors: Xing, Jiale; Du, Jing; Zhang, Xuan; Shao, Yubo; Zhang, Ting; Xu, Cailing
• Is Part Of: Dalton transactions. Volume 46:Issue 30(2017)
• Page Start: 10064
• Page End: 10072
• Publication Date: 2017-07-21
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c7dt01910f
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : In this study, nickel phosphide (Ni-P) was combined with NiCo LDH via facile phosphorization of Ni foam and subsequent electrodeposition, forming core–shell nanorod arrays on Ni foam. The obtained Ni-P@NiCo LDH delivered excellent capacitive performance. Abstract : Recently, transition metal-based nanomaterials have played a key role in the applications of supercapacitors. In this study, nickel phosphide (Ni-P) was simply combined with NiCo LDH via facile phosphorization of Ni foam and subsequent electrodeposition to form core–shell nanorod arrays on the Ni foam; the Ni-P@NiCo LDH was then directly used for a pseudocapacitive electrode. Owing to the splendid synergistic effect between Ni-P and NiCo LDH nanosheets as well as the hierarchical structure of 1D nanorods, 2D nanosheets, and 3D Ni foam, the hybrid electrode exhibited significantly enhanced electrochemical performances. The Ni-P@NiCo LDH electrode showed a high specific capacitance of 12.9 F cm −2 at 5 mA cm −2 (3470.5 F g −1 at a current density of 1.3 A g −1 ) that remained as high as 6.4 F cm −2 at a high current density of 100 mA cm −2 (1700 F g −1 at 27 A g −1 ) and excellent cycling stability (96% capacity retention after 10 000 cycles at 40 mA cm −2 ). Furthermore, the asymmetric supercapacitors (ASCs) were assembled using Ni-P@NiCo LDH as a positive electrode and activated carbon (AC) as a negative electrode. The obtained ASCs delivered remarkable energy density and power density as well as good cycling performance. The enhanced electrochemical activities open a new avenue for the development of supercapacitors.