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.

电化学电容器因其简单高效的存储机制、适中的比能量和功率密度而在储能设备中引起了极大的关注，弥补了锂离子电池与传统电容器之间的差距。活性材料在此类存储设备的能量存储机制中起着最重要的作用。在这里，我们开发了一种具有大表面积的多孔氧化镍 (NiO) 巢状颗粒，用作超级电容器应用的阴极材料。多孔NiO电极表现出优异的电化学性能，在1 A g ^-1比电流下的比容量为422 C g ^-1。此外，NiO//AC 不对称器件表现出更高的比能，为 25 Wh kg ^-1在1280 W kg ^-1的比功率下，可以在19.2 kW kg ^-1的超高比功率下保持50%以上的比能。令人惊讶的是，该设备表现出超快的功率传输性能，响应时间显着缩短（13 毫秒）。基于多孔 NiO 纳米网络的电极显示出作为电化学储能装置的超快速高效下一代电极候选者的巨大潜力。