Ag-Incorporated CeO2 nano cauliflowers for high-performance supercapacitor devicesElectronic supplementary information (ESI) available. See DOI: 10.1039/c7nj00817a

• Main Authors: Maheswari, Nallappan, Muralidharan, Gopalan
• Format: Journal Article
• Language: English
• Published: 25.09.2017
• ISSN: 1144-0546; 1369-9261
• DOI: 10.1039/c7nj00817a

In this study, we report Ag-incorporated CeO 2 nano cauliflowers prepared by a simple hydrothermal method. The excellent combination of Ag with CeO 2 has been exploited for supercapacitor applications owing to high conductive property of Ag and efficient redox activity of CeO 2 . The significant advantage of this nanostructure is to enhance the surface area (50.2 m 2 g −1 ) and conductivity that leads to the enrichment of electrochemical behaviour. Moreover, addition of Ag results in improved specific capacitance (47% improvement over the pristine), excellent rate capacity (1012 F g −1 at 10 A g −1 ) and good capacitance retention (100% over 1500 cycles) for Ag-incorporated CeO 2 . The good supercapacitive feature has a great potential for use in asymmetric supercapacitors. The asymmetric device could provide excellent specific capacitance (287 F g −1 at 2 mV s −1 ), outstanding rate capacity (140 F g −1 at 10 mV s −1 ) and enhanced cyclic stability (100% over 1000 cycles). It delivers a maximum energy density of 70 W h kg −1 and a power density of 750 W kg −1 . This study clearly demonstrates the effectiveness of incorporating Ag into the CeO 2 nanostructure with significantly improved electrochemical features. This cauliflower-like morphological structures significantly inflate the electrochemical nature of the material.