期刊
MACROMOLECULAR RAPID COMMUNICATIONS
卷 43, 期 14, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.202100884
关键词
block copolymers; holey pores; interfacial self-assembly; mesoporous materials; oxygen reduction reaction
资金
- National Natural Science Foundation of China [21774076, 52073173]
- Program of Shanghai Academic Research Leader [19XD1421700]
- Program of Distinguished Professor of Special Appointment at Shanghai Institutions of Higher Learning
This paper presents a simple approach to prepare mesoporous carbons with in-plane holey pores using block copolymers assembled on self-sacrificial templates. The resulting carbon materials exhibit improved electrocatalytic performance for oxygen reduction reaction (ORR) due to their unique pore structure.
In this paper, a simple approach, using interfacial self-assembly of block copolymers (BCPs) on self-sacrificial templates, for preparing mesoporous carbons with in-plane holey pores, including nitrogen atom-doped carbon nanosheets and nanoflowers (denoted as NHCSs and NHCFs), is reported. The approach employs sheet- or flower-like layered double hydroxide as the templates, P123 copolymer as the pore-directing agent, and m-phenylenediamine as the carbon source. The holey mesopores may shorten the mass transfer distance in the internal active sites of stacked nanosheets, while the 3D packing mode of nanosheets can reduce pore blockage caused by their tight stacking. Profiting from these structural advantages, acting as electrocatalysts for oxygen reduction reaction (ORR), both NHCSs and NHCFs show excellent catalytic performance better than that of carbon nanosheets without holey pores. Particularly, NHCFs exhibit a high half-wave-potential (0.82 V) and a limiting current density (5.4 mA cm(-2)), close to those of commercial Pt-C catalysts. This study provides valuable clues on building mesoporous materials with in-plane holey pores as well as on the effect of pore structure and stacking mode of 2D materials on their electrocatalytic ORR performance.
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