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关于PtRh电子沉积物增强氨氧化活动的机械洞察

Akhil Paliwal¹, Lina Assaf¹, Haowei Long²

¹Department of Chemistry, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, United States.

ACS applied materials & interfaces

|January 2, 2025

概括

合金催化剂可以改善电化学氨氧化,用于按需生产气. 与纯相比,稀释的Pt92Rh8合金表现出增强的活性和较低的超电位,减少了催化剂中毒.

科学领域:

电化学电化学电化学
材料科学材料科学材料科学
催化剂是一种催化剂.

背景情况:

氨是有前途的载体,由于其高能量密度和已建立的基础设施.
电化学氨氧化 (AOR) 可以在没有高压储存的情况下按需生产气.
现有的AOR催化剂存在过高的潜能,缓慢的动力学以及副产品中毒等问题.

研究的目的:

为了研究电化学氨氧化 (AOR) 活动的电沉积双金属- (PtRh) 合金纳米结构催化剂.
了解在增强基AOR催化剂的性能和耐用性方面的作用.
为了阐明在AOR期间催化剂中毒的机制.

主要方法:

双金属PtRh合金纳米结构催化剂的电解.
电化学表征,包括超电位和活性测量.
价值带X射线光电子光谱 (XPS) 用于分析电子结构.
和氧XPS在AOR之前和之后研究毒害物种.

主要成果:

稀释的Pt92Rh8催化剂表现出比纯 (0.48 V vs RHE) 低的超电位 (0.41 V vs RHE) 和更高的活性.
补充Rh将Ptd带中心转移到费米水平,优化反应中间体的吸附能.
XPS分析显示,仅Pt表面在AOR后更加氧化,这表明有氧物种阻断了活性部位.

结论:

双金属PtRh合金,特别是像Pt92Rh8这样的稀释化合物,是电化学氨氧化的有效催化剂.
通过合金对电子结构进行调整对于增强AOR动力学和减少超电位至关重要.
了解中毒机制是设计强大和耐用的催化剂的关键,用于从氨中按需生成气.

关键词:

这是一种PtRh合金.氨氧化的氨氧化.在d-band中使用.电催化剂是一种电催化剂.电极位置的电极位置

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