高分散钴氮共掺杂碳纳米纤维氧还原催化剂  

Highly Dispersed Cobalt-Nitrogen Co-doped Carbon Nanofiber as Oxygen Reduction Reaction Catalyst

作　　者：周扬[1,2] 程庆庆 黄庆红[2] 邹志青[2] 严六明[1] 杨辉[2] 

机构地区：[1]上海大学理学院,上海200444 [2]中国科学院上海高等研究院,上海201210

出　　处：《物理化学学报》2017年第7期1429-1435,共7页Acta Physico-Chimica Sinica

基　　金：国家高技术研究发展计划("863"计划;2015AA043503);国家自然科学基金(21533005;216673275)资助项目~~

摘　　要：过渡金属氮掺杂碳基催化剂已成为替代铂基氧还原反应(ORR)电催化剂的理想选择。本文通过静电纺丝技术制备了高比表面、高度分散的钴原子配位氮掺杂的碳纳米纤维催化剂(Co-N/C)。X射线衍射(XRD)和高分辨率透射电镜(HRTEM)结果证实Co元素高度分散于制备的Co-N/C催化剂中。X射线光电子能谱结果表明N元素主要以吡啶N和石墨N形式存在。该Co-N/C催化剂对ORR反应呈现出较高的电催化活性,其氧还原起始和半波电位分别为0.92 V和0.80 V(相对于标准氢电极),接近于商业化Pt/C催化剂的性能。以制备的Co-N/C催化剂作为阴极,25℃下锌空气燃料电池的开路电位1.54 V、最大功率密度达到了190 m V·cm^(-2)表明该催化剂具有良好的应用前景。Transition metal-nitrogen doped carbon-based catalysts have become promising alternatives to precious metal catalysts for the oxygen reduction reaction （ORR）. Here, we report a nitrogen-doped carbon nanofiber electrocatalyst coordinated with highly dispersed cobalt atoms （Co-N/C） with a high specific surface area prepared by an electrospinning method. X-ray diffraction （XRD） and high-resolution transmission electron microscopy （HR-TEM） results confirmed that Co was highly dispersed within the prepared Co-N/C catalyst. X-ray photoelectron spectroscopy for N ls spectra showed that the N species mainly existed in the forms of pyridinic N and graphitic N. This Co-N/C catalyst exhibited considerable ORR performance with onset and half-wave potentials at 0.92 and 0.80 V （relative to the reversible hydrogen electrode （RHE））, which are comparable to those of commercial Pt/C. With the prepared Co-N/C catalyst as the cathode, a Zn-air battery displayed an open-circuit potential of 1.54 V and a peak power density of 190 mW-cm-2 at 25 ℃, which suggest a promising application.

关 键 词：氧还原反应 过渡金属-氮掺杂催化剂 碳纳米纤维 高分散 静电纺丝 

分 类 号：O643.36[理学—物理化学]