Rational design of integrated CuO@CoxNi1−x(OH)2 nanowire arrays on copper foam for high-rate and long-life supercapacitors

摘要: Abstract Rational electrode architectural design, favorable composition, and versatile synthesis approach play a significant role in developing advanced electrodes for high-performance supercapacitor. In this work, we report facile fabricating 1D hierarchical CuO@CoxNi1−x(OH)2 nanowire arrays grown on 3D highly conductive copper foam. The optimized CuO@Co0.2Ni0.8(OH)2 delivers an ultrahigh specific capacity of 374.7 mAh g−1 at 2 A g−1 with exceptional rate capability (301.7 mAh g−1 at 50 A g−1) remarkable cycling stability (95.9% after 10 000 cycles at 50 A g−1). A flexible asymmetric solid-state supercapacitor (ASC) is fabricated using the as positive electrode, activated carbon-coated nickel foam negative polyvinyl alcohol/KOH gel electrolyte. ASC operating potential window 0–1.6 V energy density 46.5 Wh kg−1 power 526.9 W kg−1. also exhibits excellent retention 84.3% current 7 A g−1.