Nanocatalysts (NCs) with Co core–Pd shell structures and surface decoration of atomic scale Pt clusters (namely Co@Pd–Pt) are synthesized by using a self-aligned wet chemical reduction method in carbon nanotube supports. The Co@Pd–Pt contains ∼2.48 at% Pt metal. It shows a 30.2-fold mass activity (2056.3 mA mg⁻¹) of the Pt metal as compared to that of commercial Pt catalysts (67.1 mA mg⁻¹) at 0.85 volt (vs. RHE) and shows an exceptional stability of retained current density of ∼100% vs. the initial ones in an accelerated degradation test (ADT) for over 310k cycles in an alkaline electrolyte. The results of structural characterization and electrochemical analyses reveal that the high current density with substantial stability in the ORR is attributed to a strong electronic coupling and interface lattice that extract electrons from Co and Pd atoms in the presence of atomic Pt clusters in the Pd shell. A worth noticing finding is that such exceptional electrochemical performances are developed in a novel composition window in which Pt atoms are mostly positioned in defect sites of the Pd–Co interface in the shell region.

中文翻译：

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原子级Pt装饰有望在310k氧化还原循环中实现碱性电解质中Co @ Pd纳米催化剂的氧还原性能†

通过使用自对准湿式化学还原方法在碳纳米管载体中合成具有Co核-Pd壳结构和原子级Pt团簇（即Co @ Pd-Pt）的表面修饰的纳米催化剂（NC）。Co @ Pd–Pt含〜2.48 at％的Pt金属。在0.85伏特（vs. RHE）下，它与商用Pt催化剂（67.1 mA mg ^-1）相比，具有30.2倍的质量活性（2056.3 mA mg ^-1），并显示出出色的保持电流稳定性密度〜100％vs.最初的测试是在碱性电解液中进行超过310k次循环的加速降解测试（ADT）。结构表征和电化学分析的结果表明，ORR中具有高稳定性的高电流密度归因于强大的电子耦合和界面晶格，该界面晶格在Pd壳中存在原子Pt簇的情况下从Co和Pd原子中提取电子。值得注意的发现是，这种优异的电化学性能是在新颖的成分窗口中开发出来的，其中Pt原子大部分位于壳区域中Pd-Co界面的缺陷部位。