氮碳包封FeC纳米颗粒作为高效富氧还原电催化剂(英文)

被引：0
|
作者：
汪翠萍 [1 ]
李智 [1 ]
雷杰 [1 ]
李松 [1 ]
Stijn FLMertens [2 ]
胡劲松 [1 ,3 ]
机构：
[1] School of Chemical Engineering, Anhui Province Key Laboratory of Specialty Polymers, Anhui University of Science and Technology
[2] Department of Chemistry, Energy Lancaster and Materials Science Lancaster, Lancaster University
[3] Institute of Energy, Hefei Comprehensive National Science
来源：
Science China(Materials) | 2024年 / 67卷 / 03期
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摘要：
高活性MOF基催化剂的设计和合成为促进动力学不利的氧还原反应(ORR)过程开辟了新的途径.本研究通过在ZIF-8前驱体表面涂覆二茂铁甲酸,然后进行两步炭化工艺,设计和制备了一种具有新型结构的高效电催化剂,以提高ORR性能.两步炭化过程对于将热解Fe3C纳米颗粒封装到碳纳米管(CNTs)中以及将Fe单原子隔离到N掺杂碳(NC)基体上至关重要.此外, Fe元素的相对含量对优化催化剂的ORR性能至关重要.所制得Fe3C@CNTs/NC-M催化剂结构先进,在碱性溶液中表现出良好的长期稳定性和电催化ORR性能,其半波电位和极限电流分别达到0.941 V和6.31 mA cm-2.此外,该电催化剂在甲醇溶液中具有较强的耐受性和良好的稳定性. Fe3C@CNTs/NC-M锌空气电池(ZAB)具有1.525 V的开路电位, 420 mA cm-2时的峰值功率密度为348 mW cm-2,10 mA cm-2时的最大容量为843 mA h gZn-1.因此,这种合成策略为构建具有有效和稳定的ORR性能的MOF基电催化材料提供了一条有效途径.
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页数：9
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