Multi‐Anion Intercalated Layered Double Hydroxide Nanosheet‐Assembled Hollow Nanoprisms with Improved Pseudocapacitive and Electrocatalytic Properties. Issue 9 (24th March 2018)

• Record Type: Journal Article
• Authors: Li, Zhengping; Han, Fangchun; Li, Cheng; Jiao, Xiuling; Chen, Dairong
• Is Part Of: Chemistry, an Asian journal. Volume 13:Issue 9(2018)
• Page Start: 1129
• Page End: 1137
• Publication Date: 2018-03-24
• Subjects: hollow nanostructured materials -- layered double hydroxides -- oxygen evolution reaction -- OER catalysts -- supercapacitors; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/asia.201800092
• Languages: English
• ISSNs: 1861-4728

Abstract

Abstract: Electrochemically active hollow nanostructured materials hold great promise in diverse energy conversion and storage applications, however, intricate synthesis steps and poor control over compositions and morphologies have limited the realization of delicate hollow structures with advanced functional properties. In this study, we demonstrate a one‐step wet‐chemical strategy for co‐engineering the hollow nanostructure and anion intercalation of nickel cobalt layered double hydroxide (NiCo‐LDH) to attain highly electrochemical active energy conversion and storage functionalities. Self‐templated pseudomorphic transformation of cobalt acetate hydroxide solid nanoprisms using nickel nitrate leads to the construction of well‐defined NiCo‐LDH hollow nanoprisms (HNPs) with multi‐anion intercalation. The unique hierarchical nanosheet‐assembled hollow structure and efficiently expanded interlayer spacing offer an increased surface area and exposure of active sites, reduced mass and charge transfer resistance, and enhanced stability of the materials. This leads to a significant improvement in the pseudocapacitive and electrocatalytic properties of NiCo‐LDH HNP with respect to specific capacitance, rate and cycling performance, and OER overpotential, outperforming most of the recently reported NiCo‐based materials. This work establishes the potential of manipulating sacrificial template transformation for the design and fabrication of novel classes of functional materials with well‐defined nanostructures for electrochemical applications and beyond. Abstract : Hollow and soulless : A hollow nickel–cobalt layered double hydroxide nanostructure with multi‐anion intercalation is fabricated via a one‐step, self‐template, wet‐chemical method. The unique hierarchical nanosheet‐assembled hollow structure and efficiently expanded interlayer spacing offer increased exposure of active sites, reduced mass and charge transfer resistance, and enhanced stability of materials, which contribute to its excellent electrochemical performance as supercapacitor electrode material and OER electrocatalyst.