NH4CoPO4·H2O microbundles consisting of one-dimensional layered microrods for high performance supercapacitors

Abstract

Unique layered NH₄CoPO₄·H₂O microbundles consisting of one-dimensional layered microrods are firstly synthesized by a facile hydrothermal method. As a result of novel layered structures, there are many nanolayered channels for the diffusion of ions and electrolytes. The preliminary supercapacitor investigation indicates that the specific capacitance of layered NH₄CoPO₄·H₂O microbundle electrodes reaches up to 662 F g⁻¹ at a current density of 1.5 A g⁻¹ and remains at 520 F g⁻¹ even at 15.0 A g⁻¹. The cycle test shows excellent cycling performance of layered NH₄CoPO₄·H₂O microbundle electrodes (the retention 92.7% of initial specific capacitance after 3000 cycles).