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Composition-controlled synthesis of Ni2?xCoxP nanocrystals as bifunctional catalysts for water splitting

机译：Ni 2？ x Co x P纳米晶体的组成控制合成作为水分解双功能催化剂

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摘要

Ni2?xCoxP (0 ≤ x ≤ 2) nanocrystals (NCs) with good control of composition are synthesized by a facile economical approach. Low-cost air-stable triphenylphosphine is used as phosphorus source and NaBH4 is added to facilitate the reaction, which helps to carry out the reaction at relatively low temperature (250 °C). By modulating the Ni/Co precursor ratios, the composition of Ni2?xCoxP NCs can be tuned over the whole range. A comprehensive study of the key role of NaBH4 on the metal phosphide NCs formation reveals that NaBH4 can efficiently activate the triphenylphosphine, lowering the thermodynamic barrier for the P–C bond broken and thus reducing the reaction temperature. As-prepared Ni2?xCoxP NCs show Ni/Co-composition dependent catalytic performance on both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). In particular, OER catalytic activities follow the volcano relationship due to the synergistic effect. The Ni1.0Co1.0P NCs exhibit the highest OER catalytic activity with the overpotential of 0.34 V at a current density of 10 mA cm?2, among the top tier of water oxidation catalysts. In addition to providing a new green low-cost route to composition controllable synthesis of ternary phosphides, this work also contributes to fundamental guideline on rational design of low-cost high-efficient catalysts for water splitting.
机译：Ni 2？ x Co x P（ 0≤ x ≤2）通过一种简便的经济方法合成了具有良好成分控制的纳米晶体（NC）。使用低成本的空气稳定的三苯基膦作为磷源，并添加NaBH 4 以促进反应，这有助于在较低的温度（250°C）下进行反应C）。通过调节Ni / Co前驱体比率，Ni 2？ x Co x P NC可以在整个范围内进行调整。对NaBH 4 在金属磷化物NCs形成中的关键作用的综合研究表明，NaBH 4 可以有效地活化三苯基膦，降低了断裂的P–C键的热力学势垒，从而降低了反应温度。制备的Ni 2？ x Co x P NCs显示出Ni / Co成分对氢气析出反应（HER）和氧气析出反应（OER）的催化性能。特别地，由于协同作用，OER催化活性遵循火山关系。 Ni 1.0 Co 1.0 P NCs表现出最高的OER催化活性，在当前电流下的过电势为0.34 V在水氧化催化剂的顶层中，密度为10 mA cm ？2 。除了提供一种新的绿色低成本途径来控制三元磷化物的成分可控合成外，这项工作还有助于合理设计低成本高效率的水分解催化剂的基本指南。

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