Bimetallic Ni‐Co Silicate Hollow Spheres with Controllable Morphology for the Application on Supercapacitor. Issue 18 (13th May 2019)

• Record Type: Journal Article
• Authors: Dong, Fengying; Liu, Xiaojuan; Sun, Xinzhi
• Is Part Of: ChemistrySelect. Volume 4:Issue 18(2019)
• Page Start: 5258
• Page End: 5263
• Publication Date: 2019-05-13
• Subjects: Bimetallic Ni−Co silicate -- supercapacitor -- controllable morphology -- hydrothermal synthesis; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.201900683
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: A facile and one‐step synthetic method is developed to produce the layered bimetallic Ni−Co silicate with the controllable morphology and porous microstructure by using the silica as the sacrifice template at the moderate reaction conditions. The bimetallic Ni−Co silicate core‐shell and hollow spheres were obtained under 140 °C for 6 h and 12 h, respectively. The pore size and the content of metal ions of the bimetallic Ni−Co silicate could be affected by the different structure. The final product shows good dispersivity, which is benefit to the homogeneity as an active material in the electrode. The as‐prepared Ni−Co silicate hollow spheres exhibit good electrochemical performance with high specific capacitance and rate capability, good charge‐discharge stability and long cycle life. The capacitance retention of the hollow structure can reach 58.69% at the current density of 10 A/g and 86.38% after 5000 cycle. The good electrochemical performance can be attributed to the different size of the pores and layer architecture. Bimetallic Ni−Co silicate hollow spheres show better electrochemical properties than the monometallic Ni or Co, which attribute to the synergistic effect. Abstract : Bimetallic Ni−Co silicate spheres with controllable morphology and controllable structure have been synthesized under a moderate reaction conditions by a facial one‐pot hydrothermal method. The as‐prepared Ni−Co silicate hollow spheres exhibit good electrochemical performance with high specific capacitance and rate capability, good charge‐discharge stability and long cycle life. The capacitance retention can reach 58.69% at the current density of 10 A/g and 86.38% after 5000 cycle.