Direct methanol fuel cells (DMFCs) are considered favorable for portable devices due to their high energy density and the widespread availability of methanol fuel. However, the commercialization of DMFCs has been severely limited by the sluggish reaction kinetics and poor stability of the anode. In this study, compressively strained PtRu alloy nanoparticles were deposited on a nanoporous thin film (NPTF) using a differential normal pulse voltammetry technique. The resulting compressive structure is confirmed through geometrical phase analysis, revealing high-level compressive strains of about −5%. Owing to the improved specific activity and high specific surface area, the compressively strained PtRu alloy nanoparticles exhibit outstanding Pt mass activities for methanol oxidation reaction. NPTF-Pt₂Ru₁ with a Pt/Ru molar ratio of 2/1 exhibits the highest Pt mass activity (1.64 A mg_Pt⁻¹), approximately 4 times higher than that of commercial PtRu/C. When applied in membrane electrode assembly, this film anode in DMFCs further exhibits mass activity enhancement owing to the structural advantages such as weakened methanol cross-over. With a loading of 0.21 mg_Pt cm⁻², the maximum power density at 80 °C reaches 117 mW cm⁻², and the power efficiency of Pt is about 12 times higher than that of commercial PtRu/C (2 mg_Pt cm⁻², 92 mW cm⁻²). Therefore, the methodology outlined in this study demonstrates a novel and effective means of synthesizing high-performance anode catalysts for DMFCs.

中文翻译：

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高性能 DMFC 阳极压应变 PtRu 合金的设计


直接甲醇燃料电池（DMFC）由于其高能量密度和甲醇燃料的广泛可用性而被认为适用于便携式设备。然而，DMFC的商业化受到反应动力学缓慢和阳极稳定性差的严重限制。在这项研究中，使用微分法向脉冲伏安技术将压缩应变的 PtRu 合金纳米颗粒沉积在纳米多孔薄膜 (NPTF) 上。由此产生的压缩结构通过几何相位分析得到证实，揭示了约-5%的高水平压缩应变。由于提高的比活性和高比表面积，压缩应变的 PtRu 合金纳米颗粒在甲醇氧化反应中表现出出色的 Pt 质量活性。 Pt/Ru 摩尔比为 2/1 的 NPTF-Pt ₂ Ru ₁ 表现出最高的 Pt 质量活性（1.64 A mg _Pt ⁻¹ cm ⁻² 时，80℃时的最大功率密度达到117 mW cm ⁻² ，Pt的功率效率约为比商用 PtRu/C（2 mg _Pt cm ⁻² 、92 mW cm ⁻² ）高 12 倍。因此，本研究概述的方法展示了一种合成DMFC高性能阳极催化剂的新颖有效的方法。