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Effect of grain size on electrochemical performance and kinetics of Co3O4 electrode materials
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020/03/27 , DOI: 10.1039/d0ta02032j Jiaxin Hao 1, 2, 3, 4, 5 , Wenjie Wu 1, 2, 3, 4, 5 , Qiao Wang 1, 2, 3, 4, 5 , De Yan 1, 2, 3, 4, 5 , Guohan Liu 6, 7, 8 , Shanglong Peng 1, 2, 3, 4, 5
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020/03/27 , DOI: 10.1039/d0ta02032j Jiaxin Hao 1, 2, 3, 4, 5 , Wenjie Wu 1, 2, 3, 4, 5 , Qiao Wang 1, 2, 3, 4, 5 , De Yan 1, 2, 3, 4, 5 , Guohan Liu 6, 7, 8 , Shanglong Peng 1, 2, 3, 4, 5
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Co3O4 has attracted extensive attention as an electrode material for pseudocapacitors due to its simple preparation process and high theoretical capacity (3560 F g−1). Although the experimental specific capacitance is much lower than its theoretical value, in-depth research into its kinetics, which is urgently needed for further performance improvement, is still rarely seen. Here, Co3O4 electrodes with the same morphology but different grain sizes are prepared. The kinetic connection between grain size and electrochemical performance is investigated. It can be found that a smaller Co3O4 grain size is beneficial for immersion in the electrolyte, which can enhance the diffusive capacity. Furthermore, for the first time, using distribution of relaxation times (DRT) calculation, the relationship between the grain size and the reaction activation energy is studied. The results demonstrate that Co3O4 with a small grain size has a low activation energy of the charge transfer reaction and diffusion, which will make the redox reaction and diffusion in the Co3O4 electrode easier, thus leading to the improvement of the electrochemical performance.
中文翻译：
晶粒尺寸对Co3O4电极材料电化学性能和动力学的影响
Co 3 O 4的制备方法简单，理论容量高（3560 F g -1），因此作为拟电容器的电极材料受到广泛关注。尽管实验的比电容远低于其理论值，但仍很少看到对它的动力学进行深入研究，而这是进一步提高性能的迫切需要。在此，制备具有相同形态但晶粒尺寸不同的Co 3 O 4电极。研究了晶粒尺寸与电化学性能之间的动力学联系。可以发现较小的Co 3 O 4晶粒尺寸有利于浸入电解质中，这可以增强扩散能力。此外，首次使用弛豫时间分布（DRT）计算，研究了晶粒尺寸与反应活化能之间的关系。结果表明，小粒径的Co 3 O 4具有较低的电荷转移反应和扩散活化能，这将使Co 3 O 4电极中的氧化还原反应和扩散更容易，从而改善了电极的导电性。电化学性能。
更新日期：2020-04-15
中文翻译：
晶粒尺寸对Co3O4电极材料电化学性能和动力学的影响
Co 3 O 4的制备方法简单，理论容量高（3560 F g -1），因此作为拟电容器的电极材料受到广泛关注。尽管实验的比电容远低于其理论值，但仍很少看到对它的动力学进行深入研究，而这是进一步提高性能的迫切需要。在此，制备具有相同形态但晶粒尺寸不同的Co 3 O 4电极。研究了晶粒尺寸与电化学性能之间的动力学联系。可以发现较小的Co 3 O 4晶粒尺寸有利于浸入电解质中，这可以增强扩散能力。此外，首次使用弛豫时间分布（DRT）计算，研究了晶粒尺寸与反应活化能之间的关系。结果表明，小粒径的Co 3 O 4具有较低的电荷转移反应和扩散活化能，这将使Co 3 O 4电极中的氧化还原反应和扩散更容易，从而改善了电极的导电性。电化学性能。
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