Precise control of structures offers a great opportunity to efficiently tune the catalytic performance of nanomaterials, enhacing both their activity and durability. Herein, we achieve a new class of Pt islands on 3 D nut‐like PtAg nanocrystals by exploiting the lower electronegativity of Ag in conjunction with the galvanic replacement of catalytically active Pt to Ag. Such nanostructures coated with Pt nanoparticles, exhibiting exposed facets, and active surface composition enhance formic acid oxidation electrocatalysis with optimized PtAg₁ nut‐like catalysts and achieved a factor of 4.0 and 2.4 in mass and specific activities (1728.3 mA mg⁻¹ and 3.31 mA cm⁻²) relative to those of the commercial Pt/C (431.2 mA mg⁻¹ and 1.41 mA cm⁻²), respectively. Moreover, such 3 D PtAg₁ nut‐like catalysts also display great enhancement in durability with less decay for at last 500 cycles, showing a great potential to serve as promising catalysts for fuel cells and other applications. Our work provides a fundamental insight on the effect of the morphology toward liquid fuel electrooxidation, which may pave a new way for the fabrication of highly efficient electrocatalysts for fuel cells.

中文翻译：

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3D坚果状PtAg纳米晶体上的Pt岛用于高效甲酸氧化电催化

对结构的精确控制为有效调整纳米材料的催化性能，增强其活性和耐用性提供了巨大的机会。在本文中，我们通过利用较低的银电负性以及将催化活性的铂转变为银的方式，在3D坚果状PtAg纳米晶体上实现了新型的Pt岛。此类纳米结构被Pt纳米颗粒包覆，展现出暴露的小面和活性表面成分，通过优化的PtAg ₁坚果状催化剂增强了甲酸氧化电催化性能，质量和比活度分别达到4.0和2.4倍（1728.3 mA mg ^-1和3.31 mA厘米^-2）相对那些商业的Pt / C的（431.2毫安毫克^-1和1.41毫安厘米^-2）。此外，此类3 D PtAg ₁螺母状催化剂还显示出极大的耐用性，在最近500个循环中衰减较小，显示出巨大的潜力，可以用作燃料电池和其他应用的有前途的催化剂。我们的工作为形态学对液体燃料电氧化的影响提供了基本的见识，这可能为制造燃料电池高效电催化剂铺平了新途径。