Efficient Growth of Carbon Nanotube Carpets Enabled by In Situ Generation of Water
Efficient Growth of Carbon Nanotube Carpets Enabled by In Situ Generation of Water
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DOI：
10.1021/acs.iecr.0c00711
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发表时间：
2020-05-13
影响因子：
4.2
通讯作者：
Amama, Placidus B.
中科院分区：
文献类型：
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作者：
Everhart, Brian M.;Almkhelfe, Haider;Amama, Placidus B.
利用费托合成（FTS-GP）的气态产物混合物的催化化学气相沉积（CVD）提供了碳纳米管（CNT）地毯的放大和受控生长的潜力。与传统的原料相比，FTS-GP表现出使用Fe催化剂支持特别长的催化剂寿命的能力。原料在促进生长中的作用仍然知之甚少。在这项研究中，结合实验和热力学分析揭示现场生成的水是观察到的生长增强FTS-GP CVD的秘密。原位生成的水的浓度随着反应器温度的升高而降低。使用自主研究系统（战神）-一个自动化的，高通量的，激光诱导的CVD系统与原位拉曼光谱反馈-进一步调查显示FTS-GP不仅表现出非常长的催化剂寿命相比，标准原料（C2 H4），但也表现出较高的容忍度相对较高的水。
Catalytic chemical vapor deposition (CVD) utilizing the gaseous product mixture of Fischer-Tropsch synthesis (FTS-GP) offers the potential for scale-up and controlled growth of carbon nanotube (CNT) carpets. In comparison to conventional feedstocks, FTS-GP exhibits the ability to support an exceptionally long catalyst lifetime with Fe catalysts. The role of the feedstock in growth enhancement is still poorly understood. In this study, a combination of experimental and thermodynamic analyses reveal on-site generation of water to be the secret for observed growth enhancement in FTS-GP CVD. The concentration of water generated in situ decreases with increasing reactor temperature. Further investigations using an Autonomous Research System (ARES)-an automated, high-throughput, laser-induced CVD system with in situ Raman spectral feedback-reveal FTS-GP not only exhibits exceptionally long catalyst lifetimes compared to a standard feedstock (C2H4), but also shows a high tolerance for relatively high levels of water.