The rational design of electrode structure with catalysts adequately utilized is of vital importance for future fuel cells. Herein, a novel 3D oriented wholly integrated electrode comprising core–shell Fe₃O₄@N‐doped‐C (Fe₃O₄@NC) nanoparticles embedded into N‐doped ordered interconnected hierarchical porous carbon (denoted as Fe₃O₄@NC/NHPC) is developed for the oxygen reduction reaction (ORR). The as‐prepared catalyst possesses novel structure and efficient active sites. In rotating disk electrode measurements, the Fe₃O₄@NC/NHPC exhibits almost identical ORR electrocatalytic activity, superior durability, and much better methanol tolerance compared with the commercial Pt/C in acidic media. To the authors’ knowledge, this is among the best non‐precious‐metal ORR catalysts reported so far. Importantly, the Fe₃O₄@NC/NHPC is successfully in situ assembled onto carbon paper by the electrophoresis method to obtain a well‐designed 3D‐ordered electrode. With improved mass transfer and maximized active sites for ORR, the 3D‐oriented wholly integrated electrode shows superior performance to the one fabricated by the traditional method.

中文翻译：

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Fe3O4@N掺杂互连多级多孔碳及其用于酸性介质中氧还原的3D集成电极。

合理设计电极结构并充分利用催化剂对于未来燃料电池至关重要。在此，一种新型3D取向全集成电极，包含嵌入N掺杂有序互连分层多孔碳（表示为Fe 3 O 4 @）中的核壳_Fe 3 _{O 4} @N_{掺杂-C（Fe 3} O ₄ @NC ）纳米粒子NC/NHPC）是为氧还原反应（ORR）而开发的。所制备的催化剂具有新颖的结构和高效的活性位点。在旋转盘电极测量中，与商用 Pt/C 相比，Fe ₃ O ₄ @NC/NHPC 在酸性介质中表现出几乎相同的 ORR 电催化活性、优异的耐用性和更好的甲醇耐受性。据作者所知，这是迄今为止报道的最好的非贵金属 ORR 催化剂之一。重要的是，通过电泳方法成功地将Fe ₃ O ₄ @NC/NHPC原位组装到碳纸上，获得了精心设计的3D有序电极。凭借改进的传质和最大化的 ORR 活性位点，3D 导向的全集成电极显示出比传统方法制造的电极优越的性能。