Novel Interconnected Nickel-Iron Layered Double Hydroxide Nanoweb Structure for High-Performance Supercapacitor Electrodes

Many emerging technologies urgently require powerful energy storage devices, and their development depends largely on advances in material performance to meet commercialization requirements. Here, the synthesis of a novel structure of a Ni-Fe layered double hydroxide (LDH) interconnected nanoweb is achieved at low temperature (100 degrees C) using a wet-chemistry synthesis method. The 3D porous structure consists of interconnected nanowires and produces a very high specific capacitance of 1656.0 F g(-1) at a scan rate of 1 mV s(-1), which is more than double that recorded for a conventional Ni-Fe LDH nanosheet with a wrinkled structure (787.2 F g(-1) at 1 mV s(-1)). This superior performance is primarily attributed to the 3D porous structure, which provides a large surface area and facilitates electron transport along the interconnected nanowires, thereby shortening the electrolyte diffusion path. A hybrid supercapacitor using the Ni-Fe LDH nanoweb as the cathode material has a high capacitance of 56.2 F g(-1) with an energy density of 20.0 Wh kg(-1). This unique structure offers significant potential for the preparation of high-performance supercapacitors and opens a new route for the structural design and development of high-efficiency electrode materials in numerous energy storage fields.

Automated summary

This research successfully synthesized a novel structure of Ni-Fe layered double hydroxide interconnected nanoweb using wet-chemistry synthesis method at low temperature. The 3D porous structure with interconnected nanowires provides a large surface area and facilitates electron transport, resulting in higher specific capacitance and energy density compared to conventional nanoplate structures. This unique structure offers great potential for high-performance supercapacitor preparation.