Correlation between Surface Pt-Ru Bonding and CO Tolerance of PtRu/C PEFC Anode Catalysts Prepared Using a Relatively Large Surface Area Carbon Support

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters Pub Date : 2025-09-20 DOI:10.1007/s10562-025-05177-4

Tatsuya Takeguchi, Pongtorn Dhupatemiya, Napan Narischat, Garavdorj Batnyagt, Thidarat Wongsawa, Shin R. Mukai

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引用次数: 0

Abstract

We prepared PtRu/C anode catalysts for PEFCs with Ru: Pt molar ratios of 1.0, 1.3, and 2.0, supported on two types of Ketjen Black carbon (KB800 and KB1600) with surface areas of 789 and 1627 m²g^{– 1}, respectively. The PtRu particles supported on KB1600 were smaller than those supported on KB800 because of their larger surface areas. Characterization using N₂ adsorption, TEM, CO tolerance, CO stripping, and in situ X-ray absorption fine structure (XAFS) revealed well-alloyed Pt-Ru structures, providing CO adsorption sites of approximately 80–100 m²g_PtRu^{– 1}. Among the catalysts, PtRu_1.3/KB1600 exhibited the highest CO tolerance, maintaining about 0.73 V at 1000 ppm CO, outperforming a commercial catalyst (0.47 V). The differences in CO tolerance were linked to the number of active CO oxidation sites, as determined by CO stripping. Because only surface Pt-Ru bonding contributes to CO oxidation, whereas surface Ru-Ru bonding does not, the ECSA for Pt-Ru bonding of each catalyst was calculated from the results of CO stripping and in situ XAFS. This parameter can be used as a key factor in evaluating or predicting the CO tolerance of PtRu catalysts and can be optimized through proper selection of the carbon support.

Graphical Abstract

Finely dispersed PtRu₁.₃ nanoparticles on high-surface-area carbon showing enhanced CO tolerance

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采用较大表面积碳载体制备的PtRu/C PEFC阳极催化剂表面Pt-Ru键合与CO耐受性的关系

制备了Ru: Pt摩尔比分别为1.0、1.3和2.0的pefc PtRu/C阳极催化剂，载体为两种表面积分别为789和1627 m2 - 1的Ketjen黑碳（KB800和KB1600）。KB1600上的PtRu颗粒比KB800上的PtRu颗粒小，因为它们的表面积更大。通过N2吸附、TEM、CO耐受性、CO剥离和原位x射线吸收精细结构（XAFS）表征，发现Pt-Ru结构合金化良好，CO吸附位约为80-100 m2gPtRu - 1。其中，PtRu1.3/KB1600对CO的耐受性最高，在1000ppm CO下仍能维持0.73 V左右，优于商用催化剂（0.47 V）。CO耐受性的差异与活性CO氧化位点的数量有关，这是由CO剥离确定的。由于只有表面的Pt-Ru键合对CO氧化有贡献，而表面的Ru-Ru键合对CO氧化没有贡献，所以每种催化剂的Pt-Ru键合的ECSA是根据CO剥离和原位XAFS的结果计算的。该参数可作为评价或预测PtRu催化剂CO耐受性的关键因素，并可通过合理选择碳载体进行优化。精细分散的PtRu 1。高表面积碳上的₃纳米颗粒表现出增强的CO耐受性

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来源期刊

Catalysis Letters 化学-物理化学

CiteScore

5.70

自引率

3.60%

发文量

327

审稿时长

1 months

期刊介绍： Catalysis Letters aim is the rapid publication of outstanding and high-impact original research articles in catalysis. The scope of the journal covers a broad range of topics in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis. The high-quality original research articles published in Catalysis Letters are subject to rigorous peer review. Accepted papers are published online first and subsequently in print issues. All contributions must include a graphical abstract. Manuscripts should be written in English and the responsibility lies with the authors to ensure that they are grammatically and linguistically correct. Authors for whom English is not the working language are encouraged to consider using a professional language-editing service before submitting their manuscripts.