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Patterning Graphene Surfaces with Iron‐Oxide‐Embedded Mesoporous Polypyrrole and Derived N‐Doped Carbon of Tunable Pore Size
Small ( IF 13.0 ) Pub Date : 2018-01-11 , DOI: 10.1002/smll.201702755
Shuyan Zhu 1 , Hao Tian 1 , Nan Wang 1 , Bin Chen 2 , Yiyong Mai 1 , Xinliang Feng 3
Affiliation  

This study develops a novel strategy, based on block copolymer self‐assembly in solution, for preparing two‐dimensional (2D) graphene‐based mesoporous nanohybrids with well‐defined large pores of tunable sizes, by employing polystyrene‐block‐poly(ethylene oxide) (PS‐b‐PEO) spherical micelles as the pore‐creating template. The resultant 2D nanohybrids possess a sandwich‐like structure with Fe2O3 nanoparticle‐embedded mesoporous polypyrrole (PPy) monolayers grown on both sides of reduced graphene oxide (rGO) nanosheets (denoted as mPPy‐Fe2O3@rGO). Serving as supercapacitor electrode materials, the 2D ternary nanohybrids exhibit controllable capacitive performance depending on the pore size, with high capacitance (up to 1006 F/g at 1 A/g), good rate performance (750 F/g at 20 A/g) and excellent cycling stability. Furthermore, the pyrolysis of mPPy‐Fe2O3@rGO at 800 °C yields 2D sandwich‐like mesoporous nitrogen‐doped carbon/Fe3O4/rGO (mNC‐Fe3O4@rGO). The mNC‐Fe3O4@rGO nanohybrids with a mean pore size of 12 nm show excellent electrocatalytic activity as an oxygen reduction reaction (ORR) catalyst with a four‐electron transfer nature, a high half‐wave‐potential of +0.84 V and a limiting current density of 5.7 mA/cm2, which are well comparable with those of the best commercial Pt/C catalyst. This study takes advantage of block copolymer self‐assembly for the synthesis of 2D multifunctional mesoporous nanohybrids, and helps to understand the control of their structures and electrochemical performance.

中文翻译:

使用嵌入氧化铁的介孔聚吡咯和可调孔径的N掺杂碳图案化石墨烯表面

这项研究开发了一种基于嵌段共聚物在溶液中自组装的新策略,该方法通过使用聚苯乙烯嵌段聚环氧乙烷来制备具有明确定义的可调大小大孔的二维(2D)石墨烯基介孔纳米杂化体)(PS‐ b ‐ PEO)球形胶束作为造孔模板。所得的2D纳米杂化物具有类似三明治的结构,其中在还原的氧化石墨烯(rGO)纳米片的两面上均生长有Fe 2 O 3纳米粒子包埋的中孔聚吡咯(PPy)单层(表示为mPPy-Fe 2 O 3@rGO)。作为超级电容器电极材料,二维三元纳米杂化物表现出可控的电容性能,取决于孔径,具有高电容(在1 A / g时高达1006 F / g),良好的倍率性能(在20 A / g时可达750 F / g) )和出色的循环稳定性。此外,在800°C下热解mPPy-Fe 2 O 3 @rGO会产生2D三明治状介孔氮掺杂碳/ Fe 3 O 4 / rGO(mNC-Fe 3 O 4 @rGO)。mNC-Fe 3 O 4平均孔径为12 nm的@rGO纳米杂化物具有出色的电催化活性,具有四电子转移性质,+ 0.84 V的高半波电势和5.7的极限电流密度,是一种氧还原反应(ORR)催化剂mA / cm 2,可与最佳市售Pt / C催化剂相媲美。这项研究利用嵌段共聚物的自组装技术来合成2D多功能介孔纳米杂化物,并有助于理解其结构和电化学性能的控制。
更新日期:2018-01-11
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