Autologous Cobalt Phosphates with Modulated Coordination Sites for Electrocatalytic Water Oxidation.,Angewandte Chemie International Edition

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Autologous Cobalt Phosphates with Modulated Coordination Sites for Electrocatalytic Water Oxidation.
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2020-02-29 , DOI: 10.1002/anie.202001737
Jing Qi ₁ , Yang-Peng Lin ₂ , Dandan Chen ₁ , Tianhua Zhou ₂ , Wei Zhang ₁ , Rui Cao ₁

Affiliation

The correlation between metal coordination and electrocatalytic water oxidation performance is elusive in many cobalt-based materials. Herein, we designed an ideal Co phosphate-based platform to explore the effect of coordination environment on oxygen evolution reaction (OER) activity. The cobalt geometry was modulated from octahedral to tetrahedral by simple removal of water ligands in Co3 (PO4 )2 ⋅8 H2 O. Other features except the coordination structure in the two autologous materials remain similar. The two analogues display the same OER kinetics, but the anhydrous Co3 (PO4 )2 exhibits a greatly enhanced OER activity. On the basis of Raman and operando XAS results, the higher intrinsic activity of the Co tetrahedral sites is because they facilitate the formation of active high valent cobalt (hydr)oxide intermediates during OER. This work not only brings insights of OER on Co-based electrocatalysts but also provides a reference system to study the effect of metal geometry on electrocatalysis.

中文翻译：

具有调节配位位的自体磷酸钴用于电催化水氧化。

在许多钴基材料中，金属配位与电催化水氧化性能之间的关系是难以捉摸的。在这里，我们设计了一个理想的磷酸钴基平台，以探索配位环境对氧释放反应（OER）活性的影响。通过简单去除Co3（PO4）2⋅8H2 O中的水配体，将钴的几何形状从八面体调整为四面体。除两种自体材料中的配位结构外，其他特征均相似。这两个类似物显示出相同的OER动力学，但无水Co3（PO4）2显示出大大增强的OER活性。根据拉曼和操作XAS结果，Co四面体位点的较高内在活性是因为它们有助于在OER期间形成活性高价钴（氢氧化物）中间体。

更新日期：2020-02-29

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