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arXiv 2603.07009cond-mat.mtrl-scicond-mat.mes-hallcond-mat.str-el
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块体OsO₂单晶体:水氧化反应的优异催化剂

Bulk OsO2 Single Crystals: Superior Catalysts for Water Oxidation

Beihang University(北京航空航天大学);Institute of Physics, Chinese Academy of Sciences(中国科学院物理研究所)
Guojian Zhao, Zhihao Li, Ziang Meng, Shucheng Wang, Li Liu, Zhiyuan Duan, Xiaoning Wang, Hongyu Chen, Yuzhou He, Jingyu Li, Sixu Jiang, Xiaoyang Tan, Qinghua Zh… 展开作者

Guojian Zhao, Zhihao Li, Ziang Meng, Shucheng Wang, Li Liu, Zhiyuan Duan, Xiaoning Wang, Hongyu Chen, Yuzhou He, Jingyu Li, Sixu Jiang, Xiaoyang Tan, Qinghua Zhang, Qianfan Zhang, Peixin Qin, Zhiqi Liu

AI总结:

本研究发现块体 OsO₂ 单晶体在水氧化反应中表现出优异催化性能,优于商用 RuO₂ 纳米粉,挑战了纳米尺度的普遍适用性。

摘要:

尽管四氧化 ruthenium (RuO₂) 已经是众所周知的几乎最佳的氧析出反应 (OER) 催化剂,但具有相同族元素的四氧化钨 (OsO₂) 的 OER 性质却鲜为人知,主要由于长期的合成困难。在本工作中,我们报告了高纯度 OsO₂ 单晶体的成功合成,微米级的单晶体在碱性溶液中化学稳定,并表现出稳健的 OER 性能。与之形成鲜明对比的是,OsO₂ 纳米粉迅速与 KOH 溶液反应,无法用于 OER。与商用 RuO₂ 纳米粉相比,OsO₂ 单晶体显示出相似的催化电流密度,但在高电流密度下具有显著更低的过电位,并且稳定性更好。这些发现质疑了纳米尺度的普遍适用性,并突显了晶体完整性作为实现稳定和高效 OER 电催化的重要描述符。

英文摘要:

Although rutile RuO2 has been a well-known and almost the best oxygen evolution reaction (OER) catalyst, the OER properties for the similar rutile oxide OsO2 with the same group element with Ru have been unknown, mainly due to long-standing synthesis difficulties. In this work, we report the successful synthesis of high-quality OsO2 single crystals, and the ground micrometer-size single crystals are chemically stable in alkaline solutions and exhibit robust OER performance. In sharp contrast, OsO2 nanopowder reacts quickly with KOH solutions and cannot work for OER. Compared with commercial RuO2 nanopowder, the OsO2 single crystals show comparable catalytic current densities, remarkably lower overpotentials at high current densities and better stability. These findings question the universal applicability of nanoscaling and highlight crystal integrity as a key descriptor for achieving stable and efficient OER electrocatalysis.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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