Pt-based electrocatalysts are the most efficient materials for oxygen reduction reaction (ORR) due to the unfilled d orbitals while suffering from poor selectivity and durability during the 4e pathway. Herein, we reported a high-performance electrocatalyst of porous hollow carbon nanosphere encapsulated inside with PtCo alloy nanorods (PtCo@PHCNS). Specifically, the PtCo alloy nanorods with a diameter of 6 nm show a nanorod structure, and the hollow carbon nanospheres with a diameter of 400 nm and a wall thickness of 65 nm show a porous structure. Strikingly, the electrochemistry shows that PtCo@PHCNS displays the ORR onset potential () and the half-wave potential () are 0.975 V vs. RHE and 0.885 V vs. RHE under alkaline conditions, respectively. Specifically, PtCo@PHCNS shows enhanced ORR selectivity and durability that originate from the void-confinement effects of porous hollow carbon nanosphere. The strategy describes novel protection with porous carbon materials and obtains a unique electrocatalysis PtCo@PHCNS, providing a promising way for designing and synthesizing high-performance electrocatalysts.

中文翻译：

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多孔中空纳米结构的空隙限制效应提高了氧还原反应的选择性和耐久性

由于 d 轨道未填充，铂基电催化剂是氧还原反应 (ORR) 最有效的材料，但在 4e 途径中选择性和耐久性较差。在此，我们报道了一种内部封装有 PtCo 合金纳米棒的多孔空心碳纳米球的高性能电催化剂（PtCo@PHCNS）。具体而言，直径为6 nm的PtCo合金纳米棒呈现出纳米棒结构，直径为400 nm、壁厚为65 nm的空心碳纳米球呈现出多孔结构。引人注目的是，电化学显示 PtCo@PHCNS 在碱性条件下显示 ORR 起始电位 () 和半波电位 () 分别为 0.975 V vs. RHE 和 0.885 V vs. RHE。具体来说，PtCo@PHCNS 显示出增强的 ORR 选择性和耐久性，这源于多孔中空碳纳米球的空隙限制效应。该策略描述了多孔碳材料的新型保护，并获得了独特的电催化PtCo@PHCNS，为设计和合成高性能电催化剂提供了一种有前景的方法。