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首页> 外文期刊>RSC Advances >Roughening of windmill-shaped spinel Co3O4 microcrystals grown on a flexible metal substrate by a facile surface treatment to enhance their performance in the oxidation of water
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Roughening of windmill-shaped spinel Co3O4 microcrystals grown on a flexible metal substrate by a facile surface treatment to enhance their performance in the oxidation of water

机译：通过灵活的表面处理粗化在柔性金属基板上生长的风车形尖晶石Co3O4微晶，以增强其在水氧化中的性能

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High-efficiency and Earth-abundant electrocatalysts for the oxidation of water are required in the production of clean energy from the electrolysis or photolysis of water. Spinel Co3O4 microcrystals with a windmill shape were grown on a flexible metal substrate. The microcrystals were then roughened by a surface impregnation treatment. A secondary nanostructure grew out of the blades of the windmills to form a microano hierarchical structure. The as-grown microano Co3O4 had an excellent electrochemical performance in the oxidation of water. The onset overpotential of the microano Co3O4 electrocatalyst for the oxidation of water was about 0.29 V in alkaline solution and the overpotential of the optimum Co3O4 electrocatalyst was 0.41 V at a current density of 10 mA cm(-2). These results suggest that the electrochemical performance is associated with the roughness and active surface of the Co3O4 electrodes. The turnover frequency of the optimized Co3O4 reached 0.39 s(-1) at an overpotential of 0.6 V, about 1.4 times higher than that for the pristine Co3O4 microcrystals. The turnover frequency of microano Co3O4 is higher than, or comparable to, that previously reported for high-efficiency nanosized Co3O4 in alkaline solution. Stability tests indicated that these microano Co3O4 electrocatalysts were highly durable towards the oxidation of water, with no structural change and no decrease in noticeable activity after operating for 12 h in oxygen-evolving reactions. This work verifies the contribution of surface roughness and an active surface to the electrochemical oxidation of water by the design of an optimum microano Co3O4 electrocatalyst. Our current understanding of the catalytic role of a specific microano structure is also strengthened.
机译：在通过水的电解或光解生产清洁能源时，需要高效且富于地球化学作用的水氧化用电催化剂。在柔性金属基板上生长具有风车形状的尖晶石Co3O4微晶。然后通过表面浸渍处理使微晶粗糙化。二级纳米结构从风车的叶片中生长出来，形成了微米/纳米分层结构。刚生长的微/纳米Co3O4在水的氧化中具有出色的电化学性能。在碱性溶液中，用于水氧化的微米/纳米Co3O4电催化剂的起始过电势约为0.29 V，最佳的Co3O4电催化剂在10 mA cm（-2）的电流密度下的过电势为0.41V。这些结果表明，电化学性能与Co3O4电极的粗糙度和活性表面有关。优化的Co3O4的周转频率在0.6 V的超电势下达到0.39 s（-1），比原始Co3O4微晶的周转频率高约1.4倍。微米/纳米Co3O4的周转频率高于或与以前报道的碱性溶液中高效纳米级Co3O4的周转频率相当。稳定性测试表明，这些微/纳米Co3O4电催化剂对水的氧化具有很高的耐久性，在析氧反应中运行12小时后，其结构没有变化，活性也没有明显下降。通过设计最佳的微米/纳米Co3O4电催化剂，验证了表面粗糙度和活性表面对水的电化学氧化的贡献。我们目前对特定的微/纳米结构的催化作用的理解也得到了加强。

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