Co/N co-doped graphene-like nanocarbon for highly efficient oxygen reduction electrocatalyst

钴/氮共掺杂多孔类石墨烯催化剂的制备及其高效氧还原性能表征（英文）

The development of efficient and inexpensive graphene-based electrocatalysts is of great significance to promote the commercial application of fuel cell and metal-air batteries. In this paper, a new type of Co and N co-doped graphene-like nanocarbon(Co/N-GLC) material was prepared by nano-silicon protection and high temperature pyrolysis.The obtained Co/N-GLC catalyst not only has a similar morphology of graphene, but also possesses a high specific surface area(809 m2 g-1) with hierarchical porous structure(micropores/mesopores), and relative high active dopants content.These properties endow it with a good oxygen reduction activity in alkaline media, which can be comparable to commercial Pt/C catalyst. Moreover, the assembled zinc-air batteries using Co/N-GLC catalyst as the air electrode display a better discharge performance and higher stability compared to that of Pt/C electrode. This work demonstrates that the prepared graphene-like carbon catalyst has a good prospect,which can replace noble metal catalyst at the cathode in metalair batteries.

本文通过纳米硅作为保护层结合高温热解得到一种新型钴/氮共掺杂多孔类石墨烯纳米碳材料氧还原催化剂(Co/N-GLC).结果显示, Co/N-GLC具有类似于石墨烯的碳纳米薄层结构,并展现出分级多孔(微孔/介孔)特性,其比表面积高达809 m^2g^(-1);此外, Co/N-GLC还拥有较高的吡啶氮和石墨氮含量.这些优异的特性使得Co/N-GLC在碱性介质中具有出色的氧还原活性,接近于商业Pt/C催化剂.同时,在锌空气电池测试中, Co/N-GLC具有接近Pt/C电极的放电性能和优异的稳定性,表明该催化剂有望替代贵金属催化剂,具有很好的应用前景.