How to achieve a balance between excellent pseudocapacitive performance and simplicity of the synthetic pathway of Co 3 O 4 is still a challenge. Herein, hollow Co 3 O 4 microspheres were synthesized via a facile template‐free solvothermal approach with a following calcination treatment. The synthetic Co 3 O 4 exhibited remarkable electrochemical properties in terms of high specific capacity 922.7 F g ‐1 at 1 A g ‐1 , superior rate capability with 67.7% capacitance retention (1‐20 A g ‐1 ), as well as excellent cycling stability (105.6% retention after 10000 cycles). A hybrid supercapacitor device is also successfully assembled consisting of Co 3 O 4 cathode and rGO anode with a wide potential window of 0‐1.65 V and delivers a high energy density and an outstanding cycle lifetime. These superior electrochemical properties will render the hollow Co 3 O 4 microsphere material as an attractive material for promising application in high‐performance electrochemical energy storage systems.

中文翻译：

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均匀合成Co3O4中空微球的表面合成，以提高循环寿命和电化学储能性能

如何在优异的伪电容性能和Co 3 O 4合成途径的简便性之间取得平衡仍然是一个挑战。在这里，空心的Co 3 O 4微球是通过一种简便的无模板溶剂热方法合成并随后进行煅烧处理。合成的Co 3 O 4在1 A g -1下的高比容量922.7 F g -1，卓越的倍率能力和67.7％的电容保持率（1-20 A g -1）方面表现出卓越的电化学性能。循环稳定性（10000次循环后保留105.6％）。混合超级电容器设备也已成功组装，由Co 3 O 4阴极和rGO阳极组成，具有0-1.65 V的宽电势窗口，并具有高能量密度和出色的循环寿命。