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Fine-tuning the activity of oxygen evolution catalysts:The effect of oxidation pre-treatment on size-selected Ru nanoparticles

机译:微调氧析出催化剂的活性:氧化预处理对尺寸选择的Ru纳米颗粒的影响

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摘要

Water splitting is hindered by the sluggish kinetics of the oxygen evolution reaction (OER). The choice of materials for this reaction in acid is limited to the platinum group metals; high loading required of these scarce and expensive elements severely limit the scalability of such technology. Ruthenium oxide is among the best catalysts for OER, however the reported activity and stability can vary tremendously depending on the preparation conditions and pre-treatment. Herein, we investigate the effect of oxidation treatment on mass-selected Ru nanoparticles in the size range between 2 and 10 nm. The effect of two distinct oxidation pre-treatments on the activity and stability have been investigated: (1) thermal oxidation; and (2) oxidation with an oxygen plasma under vacuum. We report that activity and stability can be tuned by using different oxidation pre-treatments. Thermally oxidized particles exhibited the lowest activity, although over an order of magnitude higher than the state of the art, and the highest stability. Plasma-treated particles showed intermediate performance between as-deposited and thermally oxidized NPs.
机译:氧气逸出反应(OER)的动力学缓慢会阻碍水的分裂。在酸中进行该反应的材料的选择仅限于铂族金属。这些稀缺且昂贵的元件所需的高负载严重限制了这种技术的可扩展性。氧化钌是OER的最佳催化剂之一,但是据报道,其活性和稳定性可能会因制备条件和预处理而有很大差异。在本文中,我们研究了氧化处理对质量选择的Ru纳米颗粒的影响,该纳米颗粒的尺寸在2到10 nm之间。研究了两种不同的氧化预处理对活性和稳定性的影响:(1)热氧化; (2)在真空下用氧等离子体氧化。我们报道可以通过使用不同的氧化预处理来调节活性和稳定性。尽管比现有技术高一个数量级以上,但是热氧化的颗粒表现出最低的活性,并且具有最高的稳定性。等离子体处理的颗粒在沉积的NP和热氧化的NP之间显示出中间性能。

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