3D N, S-co-doped carbon nanotubes/graphene/MnS ternary hybrid derived from Hummers' method for highly efficient oxygen reduction reaction
3D N, S-co-doped carbon nanotubes/graphene/MnS ternary hybrid derived from Hummers' method for highly efficient oxygen reduction reaction
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源自 Hummers 高效氧还原反应方法的 3D N、S-co-掺杂碳纳米管/石墨烯/MnS 三元杂化材料
DOI：
10.1016/j.mtener.2020.100402
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发表时间：
2020-06-01
影响因子：
9.3
通讯作者：
Xu, Wenyuan
中科院分区：
文献类型：
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作者：
Chen, Yangyang;Xu, Chenxi;Xu, Wenyuan
设计和制备低成本、高活性、稳定性强的氧还原反应（ORR）催化剂对燃料电池和金属-空气电池的应用起着至关重要的作用。本论文以石墨和碳纳米管（CNT）混合物为初始碳源，采用改进的Hummers法和热解法，首次成功制备了N，S共掺杂的碳纳米管/石墨烯/MnS三元杂化材料（NSCNT/NSG/MnS）。采用扫描电镜、X射线衍射等手段对样品的形貌、结构、组成和ORR性能进行了表征。结果表明，通过有效利用残余Mn、S物种和高温下碳的强烈还原，实现了NSCNT/NSG/MnS的成功合成。此外，我们还发现所制备的NSCNT/NSG/MnS不仅能有效地稳定和分散MnS纳米粒子，而且具有大的比表面积、高的N含量和独特的三维结构。与其他同类催化剂相比，所制备的3D NSCNT/NSG/MnS具有良好的上级ORR性能（起始电位正移至1.00 V，极限电流密度达到4.93 mA/cm（2），ORR电子转移数接近4），已接近商业Pt/C催化剂。(C)2020爱思唯尔有限公司保留所有权利。
Designing and preparing oxygen reduction reaction (ORR) catalysts with low cost, high activity and strong stability play a crucial function in the application of fuel cells and metal-air batteries. In this work, we use pristine graphite and carbon nanotubes (CNT) mixture as initial carbon source, and for the first time successfully prepare N, S-co-doped carbon nanotubes/graphene/MnS ternary hybrid (NSCNT/NSG/MnS) by modified Hummers' method followed by a pyrolysis process. The morphology, structure, composition and ORR performance of the obtained sample are measured by scanning electron microscope, X-ray diffraction and lots of other techniques. The results show that the successful synthesis of NSCNT/NSG/MnS is achieved by the combination of effective exploitation of residual Mn and S species and strong reducibility of carbon under high temperature. Besides, we find that the resultant NSCNT/NSG/MnS can not only effectively stabilize and disperse MnS nanoparticles, but also possess large specific surface area, high N content and unique 3D architecture. Compared to other counterparts, the obtained 3D NSCNT/NSG/MnS exhibits superior ORR performance (the onset potential moves positively to 1.00 V; limiting-current density achieves 4.93 mA/cm(2); ORR electron transfer number is close to four), which is proven to approach that of commercial Pt/C catalyst. (C) 2020 Elsevier Ltd. All rights reserved.