High performance supercapacitors using selenium partially reduced Co3O4 on carbon cloth electrode with 3D interconnected architecture nanowires
High performance supercapacitors using selenium partially reduced Co3O4 on carbon cloth electrode with 3D interconnected architecture nanowires
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DOI：
10.1016/j.apsusc.2022.154785
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发表时间：
2022-09-14
影响因子：
6.7
通讯作者：
Hu, Wencheng
中科院分区：
文献类型：
--
作者：
Chen, Yunjian;Wang, Ni;Hu, Wencheng
具有高电导率、大比表面积和均匀孔径分布的电极在超级电容器应用中是非常理想的。本文采用水热和随后的退火方法制备了在碳布（COS@CC）上生长的硒部分还原的尖晶石Co 3 O 4的3D互连纳米线结构。无粘合剂的COS@CC电极显示出优异的比电容，在1A g（-1）下为1046.9 C g（-1），上级的倍率性能，51.6%的电容保持率和上级的循环稳定性，在15，000次循环后92.0%的电容保持率。发现这些电化学性能优于Co3O4@CC电极的电化学性能。电化学性能的提高归因于三维互连结构纳米线可以缩短离子迁移距离，提高氧化还原反应速率。此外，增加的比表面积和均匀的中孔尺寸分布可以帮助OH-在电极和电解质之间有效地扩散和转移。由于硒的部分还原和结构中更多的氧空位引起的电导率的增强促进了电子转移，从而改善了超级电容器的电化学性能。这些优异的电化学性能表明CSO@CC可用于开发高能量和功率密度的超级电容器。
The electrodes with high conductivity, large specific surface area and homogeneous pore size distribution are greatly desirable for supercapacitors applications. Herein, a hydrothermal and subsequent annealing approach was adopted to fabricate 3D interconnected nanowires architecture of selenium partially reduced spinel Co3O4 grew on the carbon cloth (COS@CC). The binder-free COS@CC electrode displays excellent specific capacitance, 1046.9 C g(-1) at 1 A g(-1), superior rate capability, 51.6% capacitance retention and superior cyclic stability, 92.0% capacitance retention after 15,000 cycles. These electrochemical performances were found to be better than that of the Co3O4@CC electrode. The enhanced electrochemical performance was ascribed to the fact that 3D interconnected architecture nanowires could shorten the ion transfer distance and heighten the rate of the redox reaction. In addition, increased specific surface area and homogeneous mesopore size distribution could assist effective diffusion and transfer of OH- between electrodes and electrolyte. The enhancement of conductivity, which is caused by the selenium partial reduction and more oxygen vacancies in the structure, facilitates electrons transfer and consequently improves the electrochemical properties of supercapacitors. These remarkable electrochemical performances indicate that the CSO@CC can be employed for developing high-energy and power-density supercapacitors.