Quick evolution of edge-shared metal-oxygen octahedrons for boosting acidic water oxidation
Quick evolution of edge-shared metal-oxygen octahedrons for boosting acidic water oxidation
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DOI：
10.1016/j.nanoen.2022.107680
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发表时间：
2022-08
期刊：
影响因子：
17.6
通讯作者：
Xiu-Tang Zhang;Hui Su;Xuan Sun;Chenyu Yang;Yuanli Li;Hui Zhang;Wanlin Zhou;Meihuan Liu;W. Cheng;Chao Wang;Huijuan Wang;Qinghua Liu
中科院分区：
文献类型：
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作者：
Xiu-Tang Zhang;Hui Su;Xuan Sun;Chenyu Yang;Yuanli Li;Hui Zhang;Wanlin Zhou;Meihuan Liu;W. Cheng;Chao Wang;Huijuan Wang;Qinghua Liu
Exploring highly durable and active electrocatalysts for water oxidation in acidic electrolytes remains a great challenge, because of the easy dissolution of active sites under harsh working conditions. Maintaining the coordination structure of active sites in the process of acidic oxygen evolution reaction (OER) to resist local active sites dissolution is theoretically viable, but rarely reported. Here, a new type of iridium-based oxide Cr-SrIrO3with body-centered cubic structure (BCC-Cr-SrIrO3) is designed for boosting acidic-OER. Thanks to this unique atomic structure, an amorphous layer of CrIrOxwith edge-shared CrOxand IrOxoctahedrons wasin situformed by quick leaching of only Sr over BCC-Cr-SrIrO3during the OER process. The edge-shared metal-oxygen octahedrons act as a tunable catalytic platform to optimize the acidic-OER, where the electron synergistic coupling effect between bimetallic octahedrons improves the OER activity by tens of times per iridium site with a mass activity of 417.6 A gIr−1at 0.3 V overpotential; while the strong coordination persistence of iridium sites in the edge-shared octahedrons under working potentials dictates superior durability with a large stability number of 7 × 105in 0.1 M HClO4. This study promises a new route for the design of superior iridium-based acidic-OER catalysts.
