Robust FeCo nanoparticles embedded in a N-doped porous carbon framework for high oxygen conversion catalytic activity in alkaline and acidic media†,Journal of Materials Chemistry A

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Robust FeCo nanoparticles embedded in a N-doped porous carbon framework for high oxygen conversion catalytic activity in alkaline and acidic media†
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2018-10-22 00:00:00 , DOI: 10.1039/c8ta06382f
Xuan-Wen Gao _{1,

2,

3,

4,

5} , Junghoon Yang _{1,

2,

3,

4} , Kyeongse Song _{1,

2,

3,

4} , Wen-Bin Luo _{5,

6,

7,

8} , Shi-Xue Dou _{5,

6,

7,

8} , Yong-Mook Kang _{1,

2,

3,

4}

Affiliation

FeCo alloy nanoparticles were nucleated onto graphitic carbon layers through the pyrolysis of polydopamine (PDA) sub-micrometer spheres to form a highly active electrocatalytic system that exhibits excellent oxygen conversion catalytic activity in both alkaline and acidic media. Owing to the strong metal chelation capability during the chemical modification and high sp²-dominant carbon yield of PDA, an abundance of non-precious-metal ions were easily trapped and absorbed into the PDA segments at room temperature by catechol and amine functional groups, followed by the in situ nucleation of FeCo alloy nanoparticles on graphitic carbon layers during the pyrolysis. The contents of graphitic nitrogen and pyridinic nitrogen were significantly increased by the presence of the non-precious-metal ions during carbonization as well, which is a result of the chelation effect of non-precious-metal atoms. Meanwhile, the FeCo nanoparticles (diameter < 5 nm) were protected by the multi-layer-graphene-like carbon layer from the harsh acid and uniformly anchored on graphitic carbon sub-microspheres, which can greatly improve the catalytic durability, particularly in acidic media. From the perspective of the whole catalytic system being used as an air electrode in rechargeable Zn–air batteries, the porous nitrogen-doped graphitic carbon framework was functionalised as a continuous conductive framework due to its catalytic activity towards high oxygen conversion and good electrical conductivity.

中文翻译：

嵌入N掺杂多孔碳骨架中的坚固的FeCo纳米颗粒可在碱性和酸性介质中实现高氧转化催化活性†

通过聚多巴胺（PDA）亚微米球的热解，FeCo合金纳米颗粒被成核在石墨碳层上，形成高活性的电催化体系，该体系在碱性和酸性介质中均具有出色的氧转化催化活性。由于PDA的化学修饰过程中具有很强的金属螯合能力，并且PDA的sp ^2-的碳收率很高，因此在室温下，儿茶酚和胺官能团很容易将大量非贵金属离子捕获并吸收到PDA链段中，其次是原地热解过程中FeCo合金纳米颗粒在石墨碳层上的形核。在碳化过程中，由于非贵金属离子的存在，石墨氮和吡啶二氮的含量也显着增加，这是非贵金属原子的螯合作用的结果。同时，FeCo纳米颗粒（直径<5 nm）受到多层石墨烯状碳层的保护，免受强酸的侵蚀，并均匀锚固在石墨碳亚微球上，可以大大提高催化耐久性，特别是在酸性介质中。从整个催化系统用作可充电Zn-空气电池的空气极的角度来看，

更新日期：2018-10-22

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