Three dimensional NiO nanonetwork electrode for efficient electrochemical energy storage application

Electrochemical capacitors have achieved prodigious attention among energy storage devices due to their simple and efficient storage mechanism, moderate specific energy and power densities which bridge the gap between Li-ion batteries and conventional capacitors. The active material plays a foremost role in the energy storage mechanism of such storage devices. Here, we have developed a porous Nickel oxide (NiO) nest-like particle with a large surface area and used as cathode material for supercapacitor application. The porous NiO electrode exhibits an excellent electrochemical performance with a specific capacity of 422 C g(-1) at 1 A g(-1) specific current. Moreover, the NiO//AC asymmetric device exhibited higher specific energy of 25 Wh kg(-1) at a specific power of 1280 W kg(-1) and could maintain more than 50% of specific energy at an extra-high specific power of 19.2 kW kg(-1). Surprisingly, the device exhibits an ultra-fast power delivery performance with a considerably lower response time (13 ms). The porous NiO nanonetwork-based electrode manifests a great potential to be an ultra-fast efficient next-generation electrode candidate for electrochemical energy storage devices. (C) 2021 Elsevier Ltd. All rights reserved.

Automated summary

The porous NiO electrode with large surface area exhibited excellent electrochemical performance and high specific capacity, suitable for supercapacitor applications. The NiO//AC asymmetric device showed higher specific energy and faster power delivery performance.