CoO with porous nanowall structure is fabricated by a combined solvothermal and annealing process. The micromorphology of CoO is fine-tuned by controlling the annealing temperature. Nano-sized pores below ~50 nm are achieved at 400 °C annealing with a high specific surface area of 65 m² g^-1. The unique porous nanowall structure leads to large surface areas and increased electrolyte/electrode interfaces, benefiting enhanced electrochemical performance of CoO. High specific capacitance of 352 F g^-1 has been obtained at 1 A g^-1 with good rate capability (72.7 % capacitance retention from 1 to 20 A g^-1) and good cycling stability (92.9 % of initial capacitance after 5000 cycles), making it a promising electrode for supercapacitor.

通过溶剂热和退火相结合的方法制备了具有多孔纳米壁结构的CoO。通过控制退火温度可以微调CoO的微观形貌。低于〜50 nm的纳米级孔是在400°C退火下实现的，具有65 m ² g ^-1的高比表面积。独特的多孔纳米壁结构导致较大的表面积和增加的电解质/电极界面，从而提高了CoO的电化学性能。在1 A g ^-1下获得了352 F g ^-1的高比电容，具有良好的倍率能力（从1到20 A g ^-1的电容保持率为72.7％））和良好的循环稳定性（5000次循环后为初始电容的92.9％），使其成为超级电容器的有希望的电极。