Transforming waste biomass with an intrinsically porous network structure into porous nitrogen-doped graphene for highly efficient oxygen reduction.
Transforming waste biomass with an intrinsically porous network structure into porous nitrogen-doped graphene for highly efficient oxygen reduction.
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DOI：
10.1039/c6cp00174b
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发表时间：
2016-04
期刊：
影响因子：
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通讯作者：
Huang Zhou;Jian Zhang;Ibrahim Saana Amiinu;Chenyu Zhang;Xiaobo Liu;Wenmao Tu;M. Pan;Shichun Mu
中科院分区：
文献类型：
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作者：
Huang Zhou;Jian Zhang;Ibrahim Saana Amiinu;Chenyu Zhang;Xiaobo Liu;Wenmao Tu;M. Pan;Shichun Mu
利用多孔生物质（大豆壳）作为碳氮源，通过煅烧和KOH活化，合成了具有非常高表面积(1152 m（2) g(-1)）的多孔氮掺杂石墨烯。为了通过调整掺杂氮的含量和类型来提高氧还原反应（ORR）的活性，在热处理过程中注入氨（NH3）。有趣的是，这种生物质衍生的石墨烯催化剂具有介孔性和高吡啶氮含量的独特性质，这有助于优异的氧还原性能。结果表明，新型无金属非铂催化剂的起始电位和半波电位分别达到-0.009 V和-0.202 V (vs. SCE)，与商业Pt/C催化剂在碱性介质中的催化活性非常接近。此外，我们的催化剂在碱性介质中比Pt/C具有更高的ORR稳定性和更强的CO和CH3OH耐受性。重要的是，在酸性介质中，与Pt/C相比，该催化剂还表现出良好的ORR性能和更高的ORR稳定性。
Porous nitrogen-doped graphene with a very high surface area (1152 m(2) g(-1)) is synthesized by a novel strategy using intrinsically porous biomass (soybean shells) as a carbon and nitrogen source via calcination and KOH activation. To redouble the oxygen reduction reaction (ORR) activity by tuning the doped-nitrogen content and type, ammonia (NH3) is injected during thermal treatment. Interestingly, this biomass-derived graphene catalyst exhibits the unique properties of mesoporosity and high pyridine-nitrogen content, which contribute to the excellent oxygen reduction performance. As a result, the onset and half-wave potentials of the new metal-free non-platinum catalyst reach -0.009 V and -0.202 V (vs. SCE), respectively, which is very close to the catalytic activity of the commercial Pt/C catalyst in alkaline media. Moreover, our catalyst has a higher ORR stability and stronger CO and CH3OH tolerance than Pt/C in alkaline media. Importantly, in acidic media, the catalyst also exhibits good ORR performance and higher ORR stability compared to Pt/C.