Ni3+ doped monolayer layered double hydroxide nanosheets as efficient electrodes for supercapacitors

Abstract

Ni³⁺ doped NiTi layered double hydroxide (NiTi-LDH) monolayer nanosheets with a particle size of ∼20 nm and a thickness of ∼0.9 nm have been successfully prepared through a facile bottom-up approach. These NiTi-LDH monolayer nanosheets exhibit excellent supercapacitor performance, including a high specific pseudocapacitance (2310 F g⁻¹ at 1.5 A g⁻¹) and long durability compared with bulk LDH, owing to highly exposed conductive Ni³⁺ species (NiOOH) which lead to the increased mobility rate of surface charge and electrolyte-transfer. Therefore, this work is expected to take a significant step towards exploring novel 2D monolayer electrode materials with unique physical and chemical properties for applications in energy storage and conversion.