Inducing defects in ordered mesoporous carbons via the block copolymer-templated high-temperature carbonization of nitrogen-containing polymeric precursors
Inducing defects in ordered mesoporous carbons via the block copolymer-templated high-temperature carbonization of nitrogen-containing polymeric precursors
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DOI：
10.1038/s41428-018-0023-0
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发表时间：
2018-05
期刊：
影响因子：
2.8
通讯作者：
Ling Gao;A. Chandra;Y. Nabae;T. Hayakawa
中科院分区：
文献类型：
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作者：
Ling Gao;A. Chandra;Y. Nabae;T. Hayakawa
石墨烯的结构缺陷直接影响其电子结构，并可能导致独特性能的发展。然而，有序介孔石墨碳中引入缺陷的问题尚未得到证实。在此，通过嵌段共聚物软模板方法和高温碳化，成功地将缺陷引入到有序六方介孔碳的石墨碳晶格中。小角X射线散射、扫描电子显微镜和氮气吸附测量表明，在高达1500℃的高温碳化和机械研磨后，仍保持了有序的~4nm圆柱形介孔结构，具有高表面积（532m2g−1）和良好的介孔性。拉曼和CHN元素分析表明，通过热处理过程中氮原子去除引起的表面重构，缺陷被引入到石墨碳晶格中。所获得的坚固且有序的含氮介孔碳（具有故意引入的缺陷）被认为是用于电化学反应和作为催化剂载体的有前途的材料。
Structural defects in graphene directly influence its electronic structure and can lead to the development of unique properties. However, the introduction of defects into ordered mesoporous graphitic carbons has yet to be demonstrated. Herein, defects were successfully introduced into the graphitic carbon lattice of well-ordered hexagonal mesoporous carbons via a block copolymer soft-template method and high-temperature carbonization. Small-angle X-ray scattering, scanning electron microscopy, and nitrogen adsorption measurements revealed that well-ordered ~4 nm cylindrical mesoporous structures with high surface areas (532 m2g−1) and good mesoporosity were maintained after high-temperature carbonization up to 1500 °C and mechanical milling. Raman and CHN elemental analyses suggested that defects were introduced into the graphitic carbon lattice through surface reconstruction induced by N-atom removal during heat treatment. The obtained robust and well-ordered N-containing mesoporous carbons with deliberately introduced defects are considered promising materials for electrochemical reactions and as catalyst supports.