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Synthesis of urchin-like Co3O4 spheres for application in oxygen evolution reaction

机译：氧气进化反应应用的血清素CO3O4球体的合成

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For oxygen evolution electrocatalysis of water splitting, unique urchin-shaped Co3O4 spheres were successfully grown on nickel foam by hydrothermal synthesis of Co(OH) F precursor and subsequent annealing method. The formation process was investigated by the evolution of phase structure and morphology with hydrothermal reaction time. And it can be explained by a 'disks-flowers-urchins' mechanism. Moreover, the Co3O4 urchins/NF exhibits considerable catalytic properties. It shows a low overpotential of 308 mV at a current density of 20 mA cm(-2) in alkaline solution. In the meantime, such material has a small Tafel slope of 82.1 mV dec(-1), large electrochemical active surface area and good long-term stability. The obvious promotion of oxygen evolution reaction performance can be attributed to the special morphology and the direct attachment to the substrate, which improve the exposed active sites, lower the internal resistance and accelerate the charge transport. Thus, the Co3O4 urchins/NF not only has a great potential promising behavior, but also provides the basis for subsequent performance improvement.
机译：对于水分裂的氧气进化电催化，通过CO（OH）F前体的水热合成和随后的退火方法在镍泡沫上成功生长独特的核素形CO3O4球体。通过相相结构和与水热反应时间的形态的演变研究了形成过程。它可以由“磁盘花 - 核心”机制解释。此外，CO 3O4核苷酸/ NF表现出相当大的催化性质。它显示出在碱性溶液中的电流密度为20 mA cm（-2）的308mV的低过电位。与此同时，这种材料具有82.1mV（-1）的小Tafel斜率，电化学活性表面积大，长期稳定性良好。氧气进化反应性能的明显促进可以归因于特殊形态和对基材的直接附着，其改善暴露的活性位点，降低内阻并加速电荷输送。因此，CO3O4内核/ NF不仅具有巨大的潜在承诺行为，而且还为后续性能改进提供了基础。

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