We demonstrate theoretically and experimentally that engineering of cation–oxygen bond strength in a perovskite structure can control redox ex-solution of B-site metals and thus the formation of metal nanoparticles at the oxide surface upon high-temperature reduction. In particular, we show that large isovalent doping significantly promotes the B-site ex-solution via tuning of the cation–oxygen bond strength, leading to high catalytic activity of CO oxidation. This method to promote ex-solution can be readily applied to various heterogeneous catalysts.

中文翻译：

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控制过渡金属与氧的结合强度可增强钙钛矿氧化物表面的氧化还原溶液。

我们从理论和实验上证明，钙钛矿结构中阳离子-氧键强度的工程化可以控制B位金属的氧化还原析出，因此可以控制高温还原后在氧化物表面形成金属纳米粒子。特别是，我们表明，通过调节阳离子-氧键的强度，大等价掺杂可以显着促进B位解离，从而导致CO氧化的高催化活性。该促进解溶液的方法可以容易地应用于各种非均相催化剂。