The quantitative characterisation of electrocatalytic properties of nanoparticle catalyst materials is so far only performed for layers typically comprising additionally conducting additives and binders. We propose a method enabling the evaluation of intrinsic catalytic activity of nanoparticles based on the diffusion-limited steady-state current. In a step-after-step process, the influence of coverage on kinetic and diffusion limited current is evaluated to highlight the challenges of sub-monolayer electroanalysis. Conclusions are used to point out strategies and their limitations for qualitative and quantitative comparison of intrinsic catalytic properties. Particularly, the impact of coverage, electrode geometry, altered diffusion profile for nanoparticles and the catalyst activity and selectivity are discussed. Fundamental information about electrochemical sub-monolayer nanoparticle analysis is provided.

中文翻译：

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在没有质量负载的先验知识的情况下评估纳米颗粒的固有催化活性

迄今为止，仅对通常包含另外的导电添加剂和粘合剂的层进行了纳米颗粒催化剂材料的电催化性能的定量表征。我们提出一种方法，能够基于扩散受限的稳态电流评估纳米颗粒的固有催化活性。在循序渐进的过程中，评估覆盖率对动力学和扩散限制电流的影响，以突出亚单层电分析的挑战。结论用于指出对本征催化性质进行定性和定量比较的策略及其局限性。特别地，讨论了覆盖率，电极几何形状，纳米颗粒改变的扩散分布以及催化剂活性和选择性的影响。