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首页> 外文期刊>Chemistry: A European journal >Completely green synthesis of colloid Adams' catalyst α-PtO _2 nanocrystals and derivative Pt nanocrystals with high activity and stability for oxygen reduction
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Completely green synthesis of colloid Adams' catalyst α-PtO _2 nanocrystals and derivative Pt nanocrystals with high activity and stability for oxygen reduction

机译：完全绿色合成胶体亚当斯的催化剂α-PtO_2纳米晶体和具有高活性和稳定性的还原性Pt纳米晶体，可还原氧气

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摘要

We report a first solution strategy for controlled synthesis of Adams' catalyst (i.e., α-PtO _2) by a facile and totally green approach using H _2PtCl _6 and water as reactants. The prepared α-PtO _2 nanocrystals (NCs) are ultrasmall in size and have very "clean" surfaces, which can be reduced to Pt NCs easily in ethanol under ambient conditions. Such Adams' catalysts have been applied as electrocatalysts beyond the field of heterogeneous catalysis. Noticeably, the water-only synthesized α-PtO _2 NCs and their derivative Pt NCs all exhibit much higher oxygen reduction reaction (ORR) activities and stabilities than that of the state-of-art Pt/C electrocatalysts. This study provides an example on the organics-free synthesis of α-PtO _2 and Pt NCs as promising cathode catalysts for fuel cell applications and, particularly, this simple, straightforward method may open a new way for the synthesis of other "clean" functional nanomaterials. All you need is water! α-PtO _2 nanocrystals (NCs) have been synthesized by a water-only synthetic method at 180 °C after reaction for 24 h. The Pt _2O NCs can be easily reduced further to Pt NCs in ethanol at room temperature. The obtained contaminants-free NCs all exhibit higher activities and stabilities for oxygen reduction reactions compared with the state-of-art Pt/C catalyst (see figure).
机译：我们报告了一种通过使用H _2PtCl _6和水作为反应物的简便且完全绿色的方法来控制合成Adams催化剂（即α-PtO_2）的第一种解决方案。制备的α-PtO_2纳米晶体（NC）尺寸超小，表面非常“干净”，可以在环境条件下在乙醇中轻松还原为Pt NCs。这种亚当斯的催化剂已被用作非均相催化领域以外的电催化剂。值得注意的是，纯水合成的α-PtO_2 NCs及其衍生物Pt NCs都比现有的Pt / C电催化剂具有更高的氧还原反应（ORR）活性和稳定性。这项研究提供了一个有关无α-PtO_2和Pt NCs的无有机物合成的例子，可作为燃料电池应用中有希望的阴极催化剂，特别是，这种简单，直接的方法可能为合成其他“清洁”功能性化合物开辟新途径纳米材料。您只需要水！反应24小时后，在180℃下通过纯水合成方法合成了α-PtO_2纳米晶体。在室温下，Pt _2O NCs可以很容易地进一步还原为乙醇中的Pt NCs。与最先进的Pt / C催化剂相比，所获得的无污染物的NCs都具有更高的活性和稳定性，可以进行氧还原反应（见图）。

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