空间结构工程在镶嵌型电催化剂性能提高中的应用
Spatial Structure Engineering in Enhancing Performance of Mosaic Electrocatalysts
摘要：
了解气-液-固界面电催化的机理和发展策略是重要而具有挑战性的。在过去的几十年里，研究人员致力于通过调节催化剂的化学组分和物理特征来提高催化剂的活性。在这里，我们开发了一种镶嵌催化剂的策略，以提高活性的电催化剂的工程空间结构。以Pt催化剂为例，镶嵌Pt导致高的催化性能，显示出比Pt膜高11倍的析氢反应（HER）的比活性，以及比商业Pt/C和均匀Pt膜更高的电流密度。发现这种策略对于其它催化剂（例如，二维PtS）和其它反应（例如，析氧反应）。镶嵌型催化剂催化性能的提高主要归因于传质性能的提高和局部电场的增强，而这两个因素都取决于催化剂的占有率。本文的工作为从催化剂空间结构的角度控制电催化提供了新的思路，为设计高效的多相催化剂提供了指导。
英文摘要：
Understanding the mechanism and developing strategies toward efficient electrocatalysis at gas-liquidsolid interfaces are important yet challenging. In the past decades, researchers have devoted many efforts to improving catalyst activity by modulating electronic properties of catalysts in terms of chemical components and physical features. Here we develop a mosaic catalyst strategy to improve activity of electrocatalysts by engineering their spatial structures. Taking Pt catalyst as an example, the mosaic Pt leads to high catalytic performance, showing a specific activity 11 times higher than uniform Pt films for hydrogen evolution reaction (HER), as well as higher current densities than commercial Pt/C and uniform Pt films. Such a strategy is found to be general to other catalysts (e.g., twodimensional PtS) and other reactions (e.g., oxygen evolution reaction). The improved catalytic performance of the mosaic catalysts is attributed to enhanced mass transferability and local electric field, both are determined by the occupation ratio of catalysts. Our work shines new light on manipulating electrocatalysis from the perspective of the spatial structure of catalyst, which would guide the design of efficient catalysts for heterogeneous reactions.
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