Subnanoscale Dual-Site Pd–Pt Layers Make PdPtCu Nanocrystals CO-Tolerant Bipolar Effective Electrocatalysts for Alcohol Fuel Cell Devices

IF 9.1 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2023-04-10 DOI:10.1021/acs.nanolett.3c00535

Xiaotong Yang, Qiang Yuan*, Jingwei Li, Tian Sheng*, Ke Xin Yao* and Xun Wang*,

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引用次数: 4

Abstract

Finding a high-performance low-Pt bipolar electrocatalyst in actual direct alcohol fuel cells (DAFCs) remains challenging and desirable. Here, we developed a crystalline [email?protected] subnanometer Pd–Pt “dual site” layer core–shell structure for the oxygen reduction reaction (ORR) and alcohol (methanol, ethylene glycol, glycerol, and their mixtures) oxidation reaction (AOR) in an alkaline electrolyte (denoted D-PdPtCu). The prepared D-PdPtCu/C achieved a direct 4-electron ORR pathway, a full oxidation pathway for AOR, and high CO tolerance. The ORR mass activity (MA) of D-PdPtCu/C delivered a 52.8- or 59.3-fold increase over commercial Pt/C or Pd/C, respectively, and no activity loss after 20000 cycles. The D-PdPtCu/C also exhibited much higher AOR MA and stability than Pt/C or Pd/C. Density functional theory revealed the intrinsic nature of a subnanometer Pd–Pt “dual site” surface for ORR and AOR activity enhancement. The D-PdPtCu/C as an effective bipolar electrocatalyst yielded higher peak power densities than commercial Pt/C in actual DAFCs.

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亚纳米级双位置Pd-Pt层制备PdPtCu纳米晶耐co双极性有效电催化剂用于酒精燃料电池装置

在实际的直接酒精燃料电池(DAFCs)中寻找一种高性能的低铂双极电催化剂仍然是具有挑战性的，也是值得期待的。在这里，我们开发了一个水晶[电子邮件?]在碱性电解质(记为D-PdPtCu)中用于氧还原反应(ORR)和醇(甲醇、乙二醇、甘油及其混合物)氧化反应(AOR)的亚纳米Pd-Pt“双位点”层核壳结构。制备的D-PdPtCu/C实现了直接的4电子ORR途径，AOR的全氧化途径，并具有较高的CO耐受性。与商业Pt/C或Pd/C相比，D-PdPtCu/C的ORR质量活性(MA)分别提高了52.8倍或59.3倍，并且在20000次循环后没有活性损失。与Pt/C和Pd/C相比，D-PdPtCu/C具有更高的AOR MA和稳定性。密度泛函理论揭示了亚纳米Pd-Pt“双位点”表面增强ORR和AOR活性的本质。作为一种有效的双极性电催化剂，D-PdPtCu/C在实际DAFCs中比商用Pt/C产生更高的峰值功率密度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.