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首页> 外文期刊>RSC Advances >Highly efficient electrocatalysts with CoO/CoFe2O4 composites embedded within N-doped porous carbon materials prepared by hard-template method for oxygen reduction reaction
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Highly efficient electrocatalysts with CoO/CoFe2O4 composites embedded within N-doped porous carbon materials prepared by hard-template method for oxygen reduction reaction

机译：硬模板法制备的N掺杂多孔碳材料中嵌入CoO / CoFe 2 O 4 复合材料的高效电催化剂

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摘要

Low-cost dual transition metal (Fe and Co) based non-noble metal electrocatalysts (NNMEs) have been explored to enhance the oxygen reduction reaction (ORR) performance in both alkaline and acidic solution. In this work, novel NNMEs derived from iron, cobalt and N-doped porous carbon materials (FeCo/NPC) were fabricated with magnesium oxide (MgO) as the hard-template. By optimizing the pyrolysis temperature (600 to 1000 °C) and the molar ratio of Fe to Co (Co, FeCo3, FeCo, Fe3Co, Fe), the highly active electrocatalyst FeCo/NPC (900) for ORR in alkaline solution was prepared, which possessed a large surface area of 958 m2 g?1. The onset potential (Eonset) and half-wave potential (E1/2) of FeCo/NPC (900) were 0.934 V and 0.865 V, respectively, comparable to the best values of NNMEs reported so far in ORR tests under alkaline conditions. Additionally, FeCo/NPC (900) exhibited better electrocatalytic properties than commercial Pt/C in terms of durability and the tolerance to methanol in alkaline media.
机译：已经探索了低成本的基于双过渡金属（Fe和Co）的非贵金属电催化剂（NNME），以增强碱性和酸性溶液中的氧还原反应（ORR）性能。在这项工作中，以氧化镁（MgO）为硬模板，制备了源自铁，钴和N掺杂的多孔碳材料（FeCo / NPC）的新型NNME。通过优化热解温度（600至1000°C）和铁与钴的摩尔比（Co，FeCo 3 ，FeCo，Fe 3 Co，Fe），制备了用于碱性溶液中ORR的高活性电催化剂FeCo / NPC（900），其表面积为958 m 2 g ？1 。发作电位（ E 发作 ）和半波电位（ E 1 / FeCo / NPC（900）的2 ）分别为0.934 V和0.865 V，与迄今为止碱性条件下ORR测试中报道的NNME最佳值相当。另外，就耐用性和在碱性介质中对甲醇的耐受性而言，FeCo / NPC（900）表现出比市售Pt / C更好的电催化性能。

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