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首页> 外文期刊>Electrocatalysis >Platinum Monolayer Electrocatalysts: Tunable Activity, Stability, and Self-Healing Properties
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Platinum Monolayer Electrocatalysts: Tunable Activity, Stability, and Self-Healing Properties

机译：铂单层电催化剂：可调节的活性，稳定性和自修复性能

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摘要

Platinum monolayer-nanostructured electrocatalysts were developed principally for the oxygen reduction reaction starting with fundamental studies on single-crystal substrates, supported by theoretical treatments, synthesizing nanoparticles, followed by scale-up syntheses and fuel cell tests. These catalysts consist of nanometer-scale core–shell particles with monolayers of platinum that are supported by metal, metal alloy, or nanostructured noble metalon-noble metal cores. In addition to an ultralow Pt content (one monolayer) and high Pt utilization (all atoms are on the surface and can participate in the reaction), these catalysts are characterized by very high activity and stability induced by supporting nanoparticles cores, by the ability to tune the catalytic activity of a Pt monolayer depending on the properties of the top atomic layer of the cores, and by a self-healing property. The latter two properties, which open particularly broad possibilities for applications of these catalysts, will be briefly analyzed in this article. Examples of tunable activity include electrocatalysts consisting of a Pt monolayer on smooth core surfaces, Pd tetrahedral nanoparticles, Pd nanowire, and hollow Pd nanoparticle cores. The self-healing properties are illustrated by stability tests involving potential cycling. Possible future research involving these catalysts is discussed.
机译：铂单层纳米结构的电催化剂的开发主要用于氧还原反应，首先是对单晶基质的基础研究，并辅以理论处理，合成纳米颗粒，然后按比例放大合成和燃料电池测试。这些催化剂由具有金属，金属合金或纳米结构的贵金属/非贵金属核支撑的单层铂的纳米级核-壳颗粒组成。除了超低的Pt含量（一个单层）和高的Pt利用率（所有原子都在表面上并且可以参与反应）之外，这些催化剂的特征还在于具有很高的活性和稳定性，而这种活性和稳定性是通过负载纳米颗粒核而产生的，根据核的顶部原子层的特性以及自愈特性来调整Pt单层的催化活性。本文将简要分析后两种性质，为使用这些催化剂提供特别广阔的可能性。可调活性的例子包括由光滑核表面上的Pt单层，Pd四面体纳米颗粒，Pd纳米线和中空Pd纳米颗粒核组成的电催化剂。通过涉及潜在循环的稳定性测试来说明自我修复性能。讨论了可能涉及这些催化剂的未来研究。

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