A phase-transition-assisted method for the rational synthesis of nitrogen-doped hierarchically porous carbon materials for the oxygen reduction reaction†,Journal of Materials Chemistry A

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A phase-transition-assisted method for the rational synthesis of nitrogen-doped hierarchically porous carbon materials for the oxygen reduction reaction†
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2017-12-11 00:00:00 , DOI: 10.1039/c7ta09435c
Wei Li _{1,

2,

3,

4,

5} , Wei Ding _{1,

2,

3,

4,

5} , Jinxia Jiang _{1,

2,

3,

4,

5} , Qian He _{1,

2,

3,

4,

5} , Sicheng Tao _{1,

2,

3,

4,

5} , Wanglan Wang _{1,

2,

3,

4,

5} , Jing Li _{1,

2,

3,

4,

5} , Zidong Wei _{1,

2,

3,

4,

5}

Affiliation

Herein, we report a phase-transition-assisted strategy that uses gas–liquid separation coupled with a gas–liquid interfacial reaction during the phase transition of precursors for constructing hierarchically porous carbon materials (HPCMs) with tunable interconnected macropore channels, and simultaneously conducting the formation of active sites along these channel walls for the oxygen reduction reaction (ORR). A HPCM with an ultrahigh specific surface area of 1141.41 m² g⁻¹ and a highly interconnected macroporous network was produced, in which the active sites are exactly located on the mass-transport channels. By adjusting the precursor's solidification rates, the porosity of HPCMs can be exactly tuned from the micrometer to the nanometer level. Such an excellent structure, by benefiting the fast mass transport and maximizing the utilization of active sites, leads to an excellent ORR performance with a half-wave potential of 0.901 V which exceeds that of the state-of-the-art Pt/C catalyst by 40 mV.

中文翻译：

一种相变辅助方法，用于合理合成用于氧还原反应的氮掺杂分级多孔碳材料†

本文中，我们报告了一种相变辅助策略，该策略在前体的相变过程中使用气液分离和气液界面反应，以构建具有可调互连大孔通道的分层多孔碳材料（HPCM），并同时进行沿这些通道壁形成活性位点以进行氧还原反应（ORR）。HPCM具有1141.41 m ² g ^-1的超高比表面积并产生了一个高度互连的大孔网络，其中的活动站点正好位于大众运输通道上。通过调整前体的固化速率，可以将HPCM的孔隙率从微米精确地调整到纳米水平。这种出色的结构，受益于快速的质量传输和最大程度地利用活性位点，从而产生了出色的ORR性能，其半波电势为0.901 V，超过了最新的Pt / C催化剂40 mV。

更新日期：2017-12-11

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