熔融电解CO $_2$控制过渡金属成核生长碳纳米管
Controlled Transition Metal Nucleated Growth of Carbon Nanotubes by Molten Electrolysis of CO$_2$
摘要：
在熔融碳酸盐中电解CO $_2$已被引入作为一种替代机制，以高产率低成本地合成碳纳米材料。直到最近，CO $_2$被认为是无反应的，使其清除成为一个挑战。CO $_2$是人为全球变暖的主要原因，其利用和转化为稳定，有价值的材料提供了一个激励途径，以减缓气候变化。本研究的重点是在熔融碳酸锂中控制电化学条件，将从大气中吸收的CO $_2$分解成碳纳米管，并分解成各种宏观的CNT组装体，这可能对纳米过滤有用。通过改变阳极和阴极的组成和结构、电解液的组成和预电解处理、以及改变电流施加和电流密度，电化学制备了不同形貌的碳纳米管。通过SEM、TEM、HAADF、EDX、XRD和Raman等分析手段，对碳纳米管的形貌结构和碳纳米管熔融碳酸盐的生长机理进行了研究。CNT生产的主要商业技术是化学气相沉积，其更昂贵一个数量级，通常需要金属有机物而不是CO $_2$作为反应物，并且可以是高能量和CO $_2$排放密集的（携带高碳正足迹，而不是负足迹）。
英文摘要：
The electrolysis of CO$_2$ in molten carbonate has been introduced as an alternative mechanism to synthesize carbon nanomaterials inexpensively at high yield. Until recently, CO$_2$ was thought to be unreactive, making its removal a challenge. CO$_2$ is the main cause of anthropogenic global warming and its utilization and transformation into a stable, valuable material provides an incentivized pathway to mitigate climate change. This study focuses on controlled electrochemical conditions in molten lithium carbonate to split CO$_2$ absorbed from the atmosphere into into carbon nanotubes, and into various macroscopic assemblies of CNTs,, which may be useful for nano-filtration. Different CNTs, morphologies were prepared electrochemically by variation of the anode and cathode composition and architecture, electrolyte composition pre-electrolysis processing, and the variation of current application and current density. Individual CNT morphologies structures and the CNT molten carbonate growth mechanism are explored by SEM, TEM, HAADF EDX, XRD and Raman. The principle commercial technology for CNT production had been chemical vapor deposition, which is an order of magnitude more expensive, generally requires metallo-organics, rather than CO$_2$ as reactants, and can be highly energy and CO$_2$ emission intensive (carries a high carbon positive, rather than negative, footprint).
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
