LAUSR

Abstract Nickel/Cobalt double hydroxide has attracted increasing attention as promising electrode material in supercapacitor field, but its poor adhesion in most conductive substrates largely thwarts the capacitance and cycling stability performance. In this work, an effective strategy was developed to synthesis Ni 0.4 Co 0.6 (OH) 2 onto carbon fiber cloth (CFC) and obtained a flexible peony-like electrode (Ni 0.4 Co 0.6 (OH) 2 /CFC) by a simple step-by-step hydrothermal method without any adscititious alkali source and oxidant. Electrochemical studies showed that this type of Ni 0.4 Co 0.6 (OH) 2 /CFC exhibited an extraordinary capacitance of 1816 F g −1 (605 F cm −2 ) at the current density of 1.0 A g −1 and excellent cycling stability with capacitance retention of 98.3% after 5000 charge/discharge cycles. After assembled to be a symmetric flexible solid supercapacitor, its electrochemical performances remained stability under flat, folded, twisted and rolled states. The remarkable electrochemical and flexible properties of Ni 0.4 Co 0.6 (OH) 2 /CFC developed in this study are obviously superior to those previously reported Ni 0.4 Co 0.6 (OH) 2 -based supercapacitors.