Self-assembled PANI/CeO2/Ni(OH)2 hierarchical hybrid spheres with improved energy storage capacity for high-performance supercapacitors

PANI/CeO2/Ni(OH)(2) hierarchical hybrid spheres were successfully prepared by a simple one-step selfassemble reaction. The structure and morphology characterization revealed the hybrid spheres were constructed with self-assembled nanosheets. The formation mechanism of the hierarchical structure was discussed. N-2 adsorption-desorption isotherms showed that the PANI/CeO2/Ni(OH)(2) had improved specific surface area. Under optimized conditions, the PANI/CeO2/Ni(OH)(2 )hierarchical hybrid spheres showed highly electrochemical activity and supercapacitor performance compared with Ni(OH)(2) and CeO2/Ni(OH)(2). The max specific capacitance reached to 2556 F g(-1). It was still as high as 2130 F g(-1) even at the high current density, showing good rate capability. After 1000 cycles continuous charge-discharge process, the hybrid sphere can retain 95.9% of its initial capacitance, indicating good cycle stability. The asymmetric specific capacitance can be of 348 F g(-1) and the capacity retention rate can hold 80.4% after 8000 cycles. Such high performance of PANI/CeO2/Ni(OH)(2) hybrids may have potential practical application value used in supercapacitors. (C) 2020 Elsevier Ltd. All rights reserved.