Electrochimica Acta, Vol.295, 655-661, 2019
A high-performance asymmetric supercapacitors based on hydrogen bonding nanoflower-like polypyrrole and NiCo(OH)(2) electrode materials
Nickel-Cobalt dihydroxide (NiCo(OH)(2)) is a promising electrode materials in supercapacitors (SCs), yet how to improve its cycling stability without losing capacitance is still a challenge. Herein, we report an innovative and facile solution approach to fabricate hydrogen bond nanoflower-like Polypyrrole and NiCo(OH)(2) (PPy@NiCo(OH)(2)) electrode. In which a three-hydrogen bond system is used to combine modified-NiCo(OH)(2) and PPy through the hydrogen bonding between the N and H. Research result shows that the PPy@NiCo(OH)(2) possesses an extraordinary specific capacitance of 1469.25 F g(-1) at current density of 1 A g(-1) and excellent cycling stability about 95.2% capacity retention after 10,000 cycles at current density of 30 A g(-1), which is superior than pure NiCo(OH)(2). An asymmetric all solid-state supercapacitor, employed active carbon (AC) and PPy@NiCo(OH)(2) as negative and positive electrodes, respectively, was also assembled and tested. Which achieves an ultra-high specific capacitance of 307.14 F g(-1) current density of 1 A g(-1), as well as excellent cycling stability of capacity retention of 93% after 5000 cycles. This strategy may shed light on designing of organic-inorganic combined new electrode materials for supercapacitors and other electrochemical devices. (C) 2018 Elsevier Ltd. All rights reserved.