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具有较高电催化活性的一种新型氮硫共掺杂石墨烯气凝胶的制备。富杂原子前驱体硫氰酸铵在170℃以上时,分解产生氨气、硫化氢和二硫化碳,利用这一反应,在水热过程中,将氮、硫杂原子掺杂到石墨烯气凝胶中。然后在氮气条件下1000℃碳化,进一步将杂原子掺杂到碳骨架中。该材料在碱性溶液中表现出了较好的氧还原活性。氧还原峰电位为-0.36V,电子转移数位3.8,这应归于该电极材料三维交联的孔结构增加了与氧气的接触面积,以及氮、硫原子被成功的掺杂到碳骨架中。
Preparation of a novel nitrogen - sulfur co - doped graphene airgel with high electrocatalytic activity. When the precursor of heteroatom-rich ammonium thiocyanate is above 170 ℃, ammonia gas, hydrogen sulfide and carbon disulfide are decomposed to take advantage of this reaction. During the hydrothermal process, nitrogen and sulfur heteroatoms are doped into the graphene airgel in. Then carbonized at 1000 ° C under nitrogen to further incorporate heteroatoms into the carbon skeleton. The material showed good oxygen reduction activity in alkaline solution. The oxygen reduction peak potential was -0.36 V and the electron transfer number was 3.8. This is attributed to the three-dimensional cross-linked pore structure of the electrode material increasing the contact area with oxygen and the nitrogen and sulfur atoms being successfully doped into the carbon skeleton.