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首页> 外文期刊>Electrocatalysis >The 'Particle Proximity Effect' in Three Dimensions: a Case Study on Vulcan XC 72R
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The 'Particle Proximity Effect' in Three Dimensions: a Case Study on Vulcan XC 72R

机译：三维的“颗粒接近效应”：以Vulcan XC 72R为例

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The "particle proximity effect" is a hypothesis claiming that Pt nanoparticles have higher ORR activity when they get closer to one another. In order to put this hypothesis under scrutiny, the "tool-box" approach was investigated in each process step by electron microscopy, ICP, and surface science methods. It is shown that particle size stability is brought about by a NaCl shell which can effectively be removed by washing with water. I.e., the "tool-box" synthesis with an additional washing step produces clean, closely spaced, and well-separated particles with interparticle distances necessary for the effect to occur. Despite this powerful synthesis route, a conclusive proof of the "proximity effect" could not be obtained. This is due to difficulties with catalyst film formation at higher platinum loadings on Vulcan XC 72R, suggesting that film deposition and drying methods have to be optimized for each catalyst loading separately and that a holistic approach is not very realistic.
机译：“粒子邻近效应”是一种假设，声称Pt纳米粒子彼此靠近时具有较高的ORR活性。为了对此假设进行审查，通过电子显微镜，ICP和表面科学方法在每个过程步骤中研究了“工具箱”方法。结果表明，NaCl壳具有一定的粒度稳定性，而NaCl壳可以通过用水洗涤有效去除。即，带有额外洗涤步骤的“工具箱”合成产生清洁，紧密间隔且良好分离的颗粒，其颗粒间的距离对于产生效果是必需的。尽管有这种强大的合成途径，仍无法获得“邻近效应”的确凿证据。这是由于在Vulcan XC 72R上较高的铂负载量下难以形成催化剂膜而造成的，这表明必须分别针对每种催化剂负载量优化膜沉积和干燥方法，并且整体方法不是很现实。

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