Mesoporous Fe-Ni-Co ternary oxide nanoflake arrays on Ni foam for high-performance supercapacitor applications

A new 3D binder-free ternary Fe-Ni-Co oxide nanoflake arrays on Ni foam was synthesized using a simple facile two-step process. The as-prepared supercapacitor electrode showed excellent electrochemical performance, such as a high specific capacitance of 867 F g(-1) and excellent cycling stability (92.3% capacitance retention after 10,000 charge-discharge cycles). In addition, an aqueous hybrid asymmetric supercapacitor device based on this material exhibited high energy density of 40 Wh kg and excellent capacitance retention of 87.4% after 5000 cycles. This outstanding electrochemical performance highlights the potential of this 3D mesoporous ternary mixed-metal oxide electrode in commercial high performance supercapacitors. (C) 2018 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.