Mesoporous and crystalline carbide-derived carbons: Towards a general correlation on synthesis temperature and precursor structure influence
Mesoporous and crystalline carbide-derived carbons: Towards a general correlation on synthesis temperature and precursor structure influence
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DOI：
10.1016/j.carbon.2021.01.003
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发表时间：
2021-04
期刊：
影响因子：
10.9
通讯作者：
Hauke Christians;Kai Brunnengräber;Jan Gläsel;B. Etzold
中科院分区：
文献类型：
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作者：
Hauke Christians;Kai Brunnengräber;Jan Gläsel;B. Etzold
碳化物衍生碳（CDCs）是一种很有前途的多孔碳，由于其具有显著的孔结构可调性和结晶度，通过选择合成参数已被证明是一种优秀的模型材料。大多数研究集中在合成温度高达1200°C的微孔、高表面积材料和主要是非晶材料。虽然研究表明，对于TiC来说，更高的温度可能导致更多的晶体和介孔结构，这对电化学应用具有很高的吸引力，但这些制度和CDC材料的研究很少。因此，碳化物前驱体和1200℃以上温度的相互作用如何影响所得碳结构仍然是一个悬而未决的问题。因此，本文研究了六种不同的碳化物（NbC, SiC, TaC, TiC， VC, ZrC）在高温（800-1600℃）下合成的cdc的结构。因此，对于碳碳距离大于0.334 nm的岩盐型碳化物，碳化物前驱体结构与碳结构之间存在直接相关关系，而对于碳碳距离小于0.334 nm的六方密排结构的SiC，只有在1600℃以上的温度下才会产生更多的晶体和介孔结构。原始特征数据通过开放访问存储库提供。
Carbide-derived carbons (CDCs) comprise a promising group of porous carbons and already proofed to be excellent model materials due to their remarkable tuneability of pore structure and crystallinity via choice of synthesis parameters. Most studies focused on microporous, high surface area materials and mainly amorphous materials at synthesis temperatures up to 1200 °C. While studies showed for TiC that higher temperatures may lead to more crystalline and mesoporous structures, which are highly attractive for electrochemical applications, these regime and CDC materials are only rarely studied. Thus, it stays an open question how the interplay of carbide precursor and temperature above 1200 °C influence the resulting carbon structure. Therefore, this work investigated the structure of CDCs synthesized at high temperatures (800–1600 °C) from six different carbides (NbC, SiC, TaC, TiC, VC, ZrC). Accordingly, for rock salt type carbides with carbon to carbon distances above 0.334 nm a direct correlation between carbide precursor structure and resulting carbon structure could be found, while for SiC with a hexagonal close-packed structure and carbon to carbon distance below 0.334 nm more crystalline and mesoporous structures only result at temperatures above 1600 °C. The raw characterization data is provided through an open access repository.