Fiona Pescher, Julian Stiegeler, Philipp A. Heizmann, Carolin Klose, Severin Vierrath and Matthias Breitwieser
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引用次数: 0
摘要
粒子原子层沉积(ALD)是一种新兴的能源应用三维材料(如粉末)工程方法。在我们的研究中,我们采用了一种商用的、可扩展的粒子原子层沉积系统来合成用于燃料电池的 Pt/C 电催化剂。经透射电子显微镜和 X 射线衍射分析验证,我们的方法可制得 Pt/C 催化剂,其特点是铂纳米颗粒高度分散,粒度分布较窄,30 wt% 的铂为 2.2 ± 0.5 nm,40 wt% 的铂为 2.6 ± 0.6 nm。ALD 合成催化剂的性能以最先进的催化剂(TEC10V50E)为基准,在应用相关的操作条件(80 °C、50% 相对湿度)下,两种催化剂都表现出相似的起始测试性能(0.65 V 下 1.6 A cm-2)。根据美国能源部的催化剂加速降解测试,经过 30,000 次电压循环后,ALD 催化剂的电化学活性表面积增加了 64%,电池性能保持得更好,在 0.65 V 电压下的电流密度比对照催化剂高出 34%。考虑到商用颗粒 ALD 系统的可扩展性,这些令人鼓舞的结果鼓励业界使用颗粒 ALD 作为燃料电池催化剂材料的新型合成方法。
Pt/C catalysts synthesized in a commercial particle atomic layer deposition system enabling improved durability in fuel cells
Particle atomic layer deposition (ALD) is an emerging method for engineering 3D materials, such as powders, for energy applications. In our study, we employ a commercially available and scalable particle ALD system to synthesize Pt/C electrocatalysts for fuel cells. Our method yields Pt/C catalysts characterized by highly dispersed platinum nanoparticles with a narrow particle size distribution of 2.2 ± 0.5 nm for 30 wt% Pt and 2.6 ± 0.6 nm for 40 wt% Pt, as verified through transmission electron microscopy and X-ray diffraction analysis. The performance of the ALD-synthesized catalysts is benchmarked against a state-of-the-art catalyst (TEC10V50E), with both catalysts exhibiting similar beginning-of-test performance (1.6 A cm−2 at 0.65 V) under application-relevant operation conditions (80 °C, 50% relative humidity). After 30 000 voltage cycles, conducted in accordance with the U.S. Department of Energy's accelerated catalyst degradation test, the ALD catalysts demonstrate up to 64% greater electrochemical active surface areas and superior retention of cell performance, with a 34% higher current density at 0.65 V, compared to the reference. Given the scalability of the commercial particle ALD system, these promising results encourage the use of particle ALD as a novel synthesis approach for fuel cell catalyst materials in the industry.
期刊介绍:
An international, peer-reviewed journal covering all of the chemical sciences, including multidisciplinary and emerging areas. RSC Advances is a gold open access journal allowing researchers free access to research articles, and offering an affordable open access publishing option for authors around the world.