In Situ Growth of Ultrathin NiO Nanosheet‐Arrays on MOF‐Derived Porous Co3O4 Scaffolds as High‐Performance Cathode for Asymmetric Supercapacitors. Issue 6 (16th March 2022)

• Record Type: Journal Article
• Authors: Zhou, Chenming; Cao, Xiaoman; Sun, Zhijia; Yingwei, ; Zhang, Qingguo
• Is Part Of: ChemElectroChem. Volume 9:Issue 6(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-03-16
• Subjects: Core-shell -- Electrochemical performance -- MOF-derived -- Nanosheet-arrays -- Porous structure; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.202101675
• Languages: English
• ISSNs: 2196-0216

Abstract

Abstract: The ever‐increasing market for portable and wearable electronic devices creates a demand for high‐efficiency electrochemical energy storage devices with excellent flexibility. Herein, MOF‐derived porous Co3 O4 scaffolds as the core, ultrathin NiO nanosheet‐arrays as the shell, well‐aligned core‐shell structured Co3 O4 @NiO were constructed on carbon cloth (CC/Co3 O4 @NiO) via facile chemical bath methods. Composition, morphological structure, and electrochemical performance of the hybrid nanomaterials were analyzed in detail. Benefiting from the MOF‐derived porous Co3 O4 core, the NiO shell with large specific surface area, and close conductive linkages between the core and shell, CC/Co3 O4 @NiO presents an outstanding areal capacitance of 3015.1 mF cm −2 (1206 F g −1 ) at 5 mA cm −2 and an exceptional rate performance. Additionally, the flexible SASC device assembled with the CC/Co3 O4 @NiO cathode possesses an ultra‐high volumetric energy density of 3.11 mWh cm −3 at a volumetric power density of 116 mW cm −3 with a satisfactory cycling stability (90.1 % of after 10000 cycles). These values are superior to the great majority of the state‐of‐the‐art flexible electrochemical capacitors. Thereby, the core‐shell structured CC/Co3 O4 @NiO is a promising candidate material for energy storage devices, and this work can provide a reference for the structural design and constructing of electrode materials. Abstract : Porous core‐shell structured Co3 O4 @NiO nanosheet‐arrays were constructed on carbon cloth via facile chemical bath methods. The obtained CC/Co3 O4 @NiO electrode exhibits an outstanding areal capacitance and rate performance. Additionally, the assembled solid‐state asymmetric supercapacitor processes an ultrahigh volumetric energy density and a satisfying cycling stability.