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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Mechanical mixtures of metal oxides and phosphorus pentoxide as novel precursors for the synthesis of transition-metal phosphides
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Mechanical mixtures of metal oxides and phosphorus pentoxide as novel precursors for the synthesis of transition-metal phosphides

机译：金属氧化物和五氧化二磷的机械混合物，用作合成过渡金属磷化物的新型前体

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摘要

This study presents a new type of precursor, mechanical mixtures of metal oxides (MOs) and phosphorus pentoxide (P2O5) are used to synthesize Ni2P, Co2P and MoP phosphides by the H-2 reduction method. In addition, this is first report of common solid-state P2O5 being used as a P source for the synthesis of metal phosphides. The traditional precursors are usually prepared via a complicated preparation procedure involving dissolution, drying and calcination steps. However, these novel MOs/P2O5 precursors can be obtained only by simple mechanical mixing of the starting materials. Furthermore, unlike the direct transformation from amorphous phases to phosphides, various specific intermediates were involved in the transformation from MOs/P2O5 to phosphides. It is worthy to note that the dispersions of Ni2P, Co2P and MoP obtained from MOs/P2O5 precursors were superior to those of the corresponding phosphides prepared from the abovementioned traditional precursors. It is suggested that the morphology of the as-prepared metal phosphides might be inherited from the corresponding MOs. Based on the results of XRD, XPS, SEM and TEM, the formation pathway of phosphides can be defined as MOs/P2O5 precursors -> complex intermediates (metals, metal phosphates and metal oxide-phosphates) -> metal phosphides.
机译：这项研究提出了一种新型的前驱体，金属氧化物（MOs）和五氧化二磷（P2O5）的机械混合物被用来通过H-2还原法合成Ni2P，Co2P和MoP磷化物。此外，这是首次报道常见的固态P2O5用作合成金属磷化物的P源。传统的前体通常是通过复杂的制备过程制备的，该过程涉及溶解，干燥和煅烧步骤。但是，这些新颖的MOs / P2O5前体只能通过简单的原料机械混合来获得。此外，不同于从无定形相到磷化物的直接转化，从MOs / P2O5到磷化物的转化涉及各种特定的中间体。值得注意的是，从MOs / P2O5前体获得的Ni2P，Co2P和MoP分散体优于由上述传统前体制备的相应磷化物的分散体。建议所制备的金属磷化物的形态可能是从相应的MO继承而来的。根据XRD，XPS，SEM和TEM的结果，可将磷化物的形成途径定义为MOs / P2O5前体->复杂中间体（金属，金属磷酸盐和金属氧化物-磷酸盐）->金属磷化物。

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