二维ZIF-L衍生的叶片状Fe-NC材料的制备及其氧还原催化性能研究
收稿日期: 2021-03-31
网络出版日期: 2021-07-08
基金资助
国家重点研发计划(2017YFA0206500);国家自然科学基金(22071202)
Preparation of 2D leaf-like Fe-NC materials derived from ZIF-L and study on their oxygen reduction catalytic performance
Received date: 2021-03-31
Online published: 2021-07-08
将柠檬酸铁铵作为Fe源掺入叶片状ZIF-L前驱体中,经过分段式高温热解成功制备出形貌维持良好的二维片状的Fe-NC催化剂。通过探究Fe载量对催化性质的影响发现,Fe-NC-1%催化剂在碱性电解质中呈现出最为优异的氧还原反应（ORR）活性,半波电位E1/2达到了0.897 V,动力学电流密度J0.85 V为26.70 mA/cm2,5 000次循环过后E1/2衰减5 mV,均超过了商业Pt/C催化剂。结合Raman光谱、XPS、BET法比表面积测定等分析表明,Fe-NC-1%的大比表面积、高石墨化程度、丰富的含氮活性物种等优势赋予了较高的传质效率及催化活性位点利用率,是促进其ORR反应动力学的重要因素。
叶谢维伊 , 郑志平 , 匡勤 . 二维ZIF-L衍生的叶片状Fe-NC材料的制备及其氧还原催化性能研究[J]. 无机盐工业, 2021 , 53(6) : 1 -7 . DOI: 10.19964/j.issn.1006-4990.2021-0203
Ammonium ferric citrate was used as the Fe source to be incorporated into the leaf like ZIF-L precursor,and the two-dimensional flake Fe-NC catalyst with good morphology was successfully prepared by stepwise pyrolysis.By optimizing Fe content in the precursors,the Fe-NC-1% catalyst was found to exhibit outstanding oxygen reduction reaction（ORR） per-formance in alkaline electrolytes,with the half-wave potential（E1/2） of 0.897 V,kinetic current density（J0.85 V） of 26.70 mA/cm2and Δ E1/2 reducing 5 mV after 5 000 cycles,which were all better than those of commercial Pt/C catalyst.The results combining with Raman spectrum,XPS and BET（specific surface area） method showed that the large specific surface area,high graphitization degree,and abundant N-containing active species of Fe-NC-1% led to the high mass transfer efficiency and utilization rate of catalytic active sites,which was an important factor to promote the ORR reaction kinetics.
Key words： oxygen reduction reaction; ZIF-L; N-doped carbon; Fe-based catalysts
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