Morphology and Composition Regulation of FeCoNi Prussian Blue Analogues to Advance in the Catalytic Performances of the Derivative Ternary Transition‐Metal Phosphides for OER,ChemCatChem

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Morphology and Composition Regulation of FeCoNi Prussian Blue Analogues to Advance in the Catalytic Performances of the Derivative Ternary Transition‐Metal Phosphides for OER
ChemCatChem ( IF 3.8 ) Pub Date : 2020-05-20 , DOI: 10.1002/cctc.202000466
Yuanxin Du ₁ , Xin Ding ₁ , Meng Han ₁ , Manzhou Zhu ₁

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Prussian blue analogues (PBAs) are mostly binary metallic compounds with a cubic structure, which greatly limits the structure and component of derived transition‐metal phosphides (TMPs) and affects their catalytic activities. This work focuses on regulating the morphology and composition of the PBA at the front‐end to optimize the OER performance of the derived TMP. By temperature control surfactant desorption ability, we obtain a series of ternary FeCoNi (FCN‐PBAs). With the increase of temperature, their morphologies change from truncated octahedrons to cubic octahedrons and truncated cubes, in which the Fe content basically remains unchanged and the Co/Ni ratio gradually decreased. Due to the synergistic effect among ternary TMPs, all phosphidation products (FCN‐P) exhibit better OER activities than RuO₂, among which FCN‐40‐P shows the best performance. As confirmed by XPS analyses, the appropriate chemical composition enhances the oxidizabilityof TM species, promotes the chemical adsorption of OH⁻, and accelerates OER kinetics.

中文翻译：

FeCoNi普鲁士蓝类似物的形态和组成调控，以促进三元过渡金属磷化物对OER的催化性能

普鲁士蓝类似物（PBA）大多数是具有立方结构的二元金属化合物，极大地限制了衍生的过渡金属磷化物（TMP）的结构和成分，并影响了其催化活性。这项工作的重点是在前端调节PBA的形态和组成，以优化衍生TMP的OER性能。通过控制表面活性剂的解吸能力，我们获得了一系列三元FeCoNi（FCN-PBAs）。随着温度的升高，它们的形态从截断的八面体变为立方的八面体和截头的立方，其中Fe含量基本保持不变，Co / Ni比逐渐降低。由于三元TMP之间的协同作用，所有磷酸化产物（FCN-P）的OER活性都比RuO _2好，其中FCN-40-P表现最佳。证实通过XPS分析，适当的化学组成提高oxidizabilityof TM物种，促进化学吸附的OH ^-，和加速OER动力学。

更新日期：2020-05-20

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