In order to solve the problems of poor catalytic activity of non-precious metal catalysts and low utilization of active sites in anion exchange membrane fuel cells. In this paper, catalyst precursors of Co²⁺ chelated dopamine-coated melamine cyanuric acid templates were synthesized by the template method at room temperature. Three-dimensional nanosheet crosslinked hollow Co, N dual-doped carbon nanostructures (CoO_x@NHCS) electrocatalysts were prepared by rational carbonization. The CoO_x@NHCS with highly open porous structure can effectively promote the transport of gases and products. The catalyst exhibited a half-wave potential of 0.866 V and a limiting current density of 5.25 mA cm⁻² in alkaline media, as well as a kinetic current density 1.4 times higher than that of commercial Pt/C at 0.85 V. CoO_x@NHCS was used as a cathode catalyst for anion exchange membrane fuel cells with a loading mass of 2.5 mg cm⁻², and the maximum power density of anion exchange membrane fuel cells reached 234 mW cm⁻². In addition, the catalyst exhibited remarkable methanol tolerance and good stability under operating conditions. A new idea is provided for the preparation of heteroatom-doped carbon catalysts with a three-dimensional porous structure for application in anion-exchange membrane fuel cells.

中文翻译：

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基于球形纳米片结构模板制备的空心多孔 Co-N 双掺杂氧还原反应催化剂


为了解决阴离子交换膜燃料电池中非贵金属催化剂催化活性差和活性位点利用率低的问题。本文在室温下采用模板法合成了 Co ²⁺ 螯合多巴胺包被的三聚氰胺氰尿酸模板的催化剂前驱体。通过合理的碳化制备了三维纳米片交联空心 Co、N 双掺杂碳纳米结构 （CoO _x @NHCS） 电催化剂。具有高度开放多孔结构的 CoO _x @NHCS可以有效促进气体和产物的输送。该催化剂在碱性介质中表现出 0.866 V 的半波电位和 5.25 mA cm ⁻² 的极限电流密度，以及在 0.85 V 时的动力学电流密度比商用 Pt/C 高 1.4 倍。CoO _x @NHCS 用作负载质量为 2.5 mg cm ⁻² 的阴离子交换膜燃料电池的阴极催化剂， 阴离子交换膜燃料电池的最大功率密度达到 234 mW cm ⁻² 。此外，该催化剂在操作条件下表现出显著的甲醇耐受性和良好的稳定性。为制备具有三维多孔结构的杂原子掺杂碳催化剂提供了新思路，用于阴离子交换膜燃料电池。