Tuning surface strain has been proven to be an efficient strategy for improving the kinetics of the oxygen reduction reaction of Pt–M electrocatalysts (M = non-noble metals). However, it remains a grand challenge to achieve optimal compressive strain, particularly on a platform of low-Pt nanocrystals. Herein, we report a novel approach involving the partial substitution of a Pt site with Ga, resulting in the development of a high-performance L1₀-type Pt_0.8Ga_0.2Co intermetallic catalyst. The incorporation of Ga not only fine-tunes the surface strain to approach the optimum region of the theoretical volcano plot but also facilitates the formation of a more stable intermetallic structure dynamically. This enhancement significantly improves long-term electrochemical durability. Pt_0.8Ga_0.2Co/C exhibits a markedly improved intrinsic activity of 3.39 mA cm^–2 and, more importantly, a high mass activity of 0.77 A mg_Pt^–1 at 0.90 V in a fuel cell, surpassing the performance of most previously reported L1₀ Pt-based intermetallics. Notably, catalytic durability is confirmed through only 28% mass activity loss after 30,000 potential cycles (vs 40% loss for the DOE target). This work paves the way for the development of promising low-Pt electrocatalysts for efficient energy conversion devices.

中文翻译：

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L10 型 Pt0.8Ga0.2Co 金属间化合物催化剂中的优化表面应变，以增强燃料电池中的氧还原


调整表面应变已被证明是改善 Pt-M 电催化剂（M = 非贵金属）氧还原反应动力学的有效策略。然而，实现最佳压缩应变仍然是一个巨大的挑战，尤其是在低 Pt 纳米晶体平台上。在此，我们报道了一种涉及用 Ga 部分取代 Pt 位点的新方法，从而开发出一种高性能的 L1₀ 型 Pt_0.8Ga_0.2Co 金属间化合物催化剂。Ga 的掺入不仅微调了表面应变以接近理论火山图的最佳区域，而且还有助于动态地形成更稳定的金属间化合物结构。这种增强显著提高了长期电化学耐久性。Pt_0.8Ga_0.2Co/C 在燃料电池中表现出 3.39 mA ^cm-2 的本征活性显着提高，更重要的是，在 0.90 V 下，^Pt-1 的质量活性为 0.77 A mg_Pt–1，超过了以前报道的大多数 L1₀ Pt 基金属间化合物的性能。值得注意的是，在 30,000 次潜在循环后，质量活性损失仅为 28%（而 DOE 目标的损失为 40%），证实了催化耐久性。这项工作为开发用于高效能量转换器件的有前途的低 Pt 电催化剂铺平了道路。