一种用于增强酸性介质中析氧反应性能的多孔焦绿石Y[Ru Y]O电催化剂。
A Porous Pyrochlore Y [Ru Y ]O Electrocatalyst for Enhanced Performance towards the Oxygen Evolution Reaction in Acidic Media.
作者信息
Kim Jaemin, Shih Pei-Chieh, Qin Yao, Al-Bardan Zaid, Sun Cheng-Jun, Yang Hong
机构信息
Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, IL, 61801, USA.
The Institute for Advanced Materials & Nano Biomedicine, Tongji University, 67 Chifeng Rd., Shanghai, 200092, P. R. China.
出版信息
Angew Chem Int Ed Engl. 2018 Oct 15;57(42):13877-13881. doi: 10.1002/anie.201808825. Epub 2018 Sep 19.
A robust porous structure is often needed for practical applications in electrochemical devices, such as fuel cells, batteries, and electrolyzers. While templating approach is useful for the preparation of porous materials in general, it is not effective for the synthesis of oxide-based electrocatalysts owing to the chemical instability of disordered porous materials thus created. Now the synthesis of phase-pure porous yttrium ruthenate pyrochlore oxide using an unconventional porogen of perchloric acid is presented. The lattice oxygen defects are formed by the mixed-valence state of Ru through the partial substitution of Ru with Y cations, leading to the formation of mixed B-site Y [Ru Y ]O . This porous Y [Ru Y ]O electrocatalyst exhibits a turnover frequency (TOF) of 560 s (at 1.5 V versus RHE) for the oxygen evolution reaction, which is two orders of magnitude higher than that of the RuO reference catalyst (5.41 s ).
在诸如燃料电池、电池和电解槽等电化学装置的实际应用中，通常需要坚固的多孔结构。虽然模板法一般可用于制备多孔材料，但由于由此产生的无序多孔材料的化学不稳定性，它对于合成氧化物基电催化剂并不有效。现在介绍了使用高氯酸这种非常规致孔剂合成相纯的钇钌酸盐焦绿石氧化物多孔材料的方法。通过用Y阳离子部分取代Ru，Ru的混合价态形成晶格氧缺陷，导致形成混合B位Y[RuY]O。这种多孔Y[RuY]O电催化剂在析氧反应中表现出560 s⁻¹（相对于可逆氢电极在1.5 V时）的周转频率（TOF），比RuO₂参比催化剂（5.41 s⁻¹）高两个数量级。
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