Facile template-free synthesis of ultralayered mesoporous nickel cobaltite nanowires towards high-performance electrochemical capacitors

Abstract

In this work, we proposed a facile and scalable template-free strategy to synthesize one-dimensional (1D) ultralayered mesoporous nickel cobaltite (NiCo₂O₄) nanowires (NWs), which are constructed from lots of quasi-single-crystalline NiCo₂O₄ nanosheet building blocks. The unique ultralayered mesoporous nanowire electrode exhibited high specific capacitance (401 F g⁻¹ at 1 A g⁻¹), good rate capability (75% capacity retention at 8 A g⁻¹) and excellent cycling stability (only ca. 10% loss after 5000 cycles), exhibiting its great potential application in high-performance electrochemical capacitors as an advanced electrode material. The desirable capacitive performance is mainly attributed to its binary electroactive sites of Co and Ni species, and its intriguing ultralayered mesoporous NWs features.