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研发成本低、催化活性高和耐久性好的非贵金属氧还原催化剂对促进燃料电池商业化发展有着重要意义.以具有芳香性的聚2,5-苯并咪唑为原料、氧化镁为模板，通过高温热解制备钴和氮共掺杂三维石墨烯催化剂.利用扫描电子显微镜、X射线衍射仪、拉曼光谱仪和氮吸附仪对催化剂进行表征，并利用旋转圆盘电极对其进行电化学测试.结果表明，催化剂具有三维多孔石墨烯结构，三维多孔结构具有更高的比表面积和更多的缺陷，有助于强化传质；Co-N-C#2催化剂的起始电位为0.084 V,半波电位为-0.036 V,电子转移数为3.95;在持续工作50 000 s后，电流密度仅降低22.9%,该催化剂表现出优异的电催化活性和耐久性.
Abstract：The development of non-noble metal oxygen reduction catalysts with low cost, high activity and stability is critical for the commercial development of fuel cells.Co and N co-doped three-dimensional graphene have been prepared by pyrolysis with aromaticity poly(2,5-benzimidazole) as the precursor and MgO as the template.The catalyst is characterized by scanning electron microscopy, X-ray diffraction, Raman spectroscopy and nitrogen adsorption instrument, and the electrochemical tests are measured by rotating disk electrode.The test results reveal that the catalyst possesses three-dimensional porous structures with a higher specific surface area and more defects, which is conducive to boosting mass transfer.The onset potential of Co-N-C#2 is 0.084 V,and the half-wave potential of Co-N-C#2 is-0.036 V,the number of electron transfers is 3.95.The current density decreased by only 22.9% after 50 000 s of continuous operation.Co-N-C#2 catalyst exhibits excellent electrocatalytic activity and durability.
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基本信息:
DOI：10.20212/j.issn.1008-2441.2025.02.006
中图分类号:O643.36;TM911.41
引用信息:
[1]张廷尉,罗维巍,李铁纯,等.三维多孔Co-N-C催化剂的制备及其电催化性能研究[J].鞍山师范学院学报,2025,27(02):32-36.DOI:10.20212/j.issn.1008-2441.2025.02.006.
基金信息:
辽宁省博士科研启动基金计划项目(2022-BS-346); 鞍山师范学院校级科研项目(22KYXM044)
2024-09-19
2024
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2024-11-29
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2025-04-20
2025-04-20