Ruthenium Oxide Nanosheets for Enhanced Oxygen Evolution Catalysis in Acidic Medium
Ruthenium Oxide Nanosheets for Enhanced Oxygen Evolution Catalysis in Acidic Medium
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DOI：
10.1002/aenm.201803795
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发表时间：
2019-04-18
影响因子：
27.8
通讯作者：
Lotsch, Bettina V.
中科院分区：
文献类型：
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作者：
Laha, Sourav;Lee, Yonghyuk;Lotsch, Bettina V.
报道了制备高活性、高稳定性的六方晶系氧化钌纳米片用于酸性环境中的电催化析氧反应。在迄今为止报道的所有溶液处理的酸性介质电催化剂中，该纳米片表现出最好的OER活性，在仅约255 mV的过电位下达到10 mA cm（-2）。纳米片还在苛刻的氧化条件下表现出鲁棒性。理论计算给出了深入的OER机制，并揭示了边缘的起源的高OER活性的纳米片。此外，后OER分析表明，除了粗化，在电催化过程中的纳米片或钌的氧化态的形态没有可观察到的变化。因此，目前的研究表明，石墨烯纳米片是一种很有前途的酸性介质OER催化剂，在质子交换膜电解槽及其他领域具有应用潜力。
The fabrication of highly active and robust hexagonal ruthenium oxide nanosheets for the electrocatalytic oxygen evolution reaction (OER) in an acidic environment is reported. The ruthenate nanosheets exhibit the best OER activity of all solution-processed acid medium electrocatalysts reported to date, reaching 10 mA cm(-2) at an overpotential of only approximate to 255 mV. The nanosheets also demonstrate robustness under harsh oxidizing conditions. Theoretical calculations give insights into the OER mechanism and reveal that the edges are the origin of the high OER activity of the nanosheets. Moreover, the post OER analyses indicate, apart from coarsening, no observable change in the morphology of the nanosheets or oxidation states of ruthenium during the electrocatalytic process. Therefore, the present investigation suggests that ruthenate nanosheets are a promising acid medium OER catalyst with application potential in proton exchange membrane electrolyzers and beyond.