Even though extensive efforts have been devoted to pursue promising electrocatalysts, the design of high-efficiency and low-cost electrocatalysts continues to be a formidable challenge for commercializing electrochemical energy technologies. Herein, we report the successful creation of a class of three-dimensional ordered Pd₃Pb nanosheet assemblies (NSAs) via a wet-chemical approach. Such controlled nanostructures with ordered phase and highly open structure exhibit enhanced electrochemical activity and durability for both the anodic methanol oxidation reaction (MOR) and cathodic oxygen reduction reaction (ORR). In particular, the ordered Pd₃Pb NSAs show ORR mass and specific activities of 0.697 A mg_Pd^–1 and 0.989 mA cm^–2 at 0.90 V versusthe reversible hydrogen electrode (RHE), which are 8.3 (10.9) and 7.5 (6.4) times higher than those of the commercial Pt/C (Pd/C), respectively, making them among the most efficient catalysts ever achieved for Pd-based ORR catalysts to date. In addition, the ordered Pd₃Pb NSAs can even sustain at least 20000 potential cycles with limited activity decay and structure change.

中文翻译：

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三维Pd ₃ Pb纳米片组件：用于双功能燃料电池反应的高性能非Pt电催化剂

尽管已经投入了巨大的努力来寻求有前途的电催化剂，但是高效和低成本电催化剂的设计仍然是商业化电化学能源技术的巨大挑战。在这里，我们报告通过湿化学方法成功创建了一类三维有序Pd ₃ Pb纳米片组件（NSA）。这种具有有序相和高度开放结构的受控纳米结构对于阳极甲醇氧化反应（MOR）和阴极氧还原反应（ORR）均显示出增强的电化学活性和耐久性。特别是，有序的Pd ₃ Pb NSA显示ORR质量和比活度分别为0.697 A mg _Pd ^–1和0.989 mA cm ^–2相对于可逆氢电极（RHE）在0.90 V时，分别比市售Pt / C（Pd / C）高8.3（10.9）和7.5（6.4）倍，使其成为有史以来最高效的催化剂迄今为止，钯基ORR催化剂。此外，有序的Pd ₃ Pb NSA甚至可以维持至少20000个潜在周期，且活性衰减和结构变化有限。