Chinese Academy of Sciences (CAS) Center for Excellence in Nanoscience, CAS Key Laboratory of Nanosystem and Hierarchy Fabrication , National Center for Nanoscience and Technology , Beijing 100190 , People's Republic of China.
Conn Center for Renewable Energy Research , University of Louisville , Louisville , Kentucky 40292 , United States.
Nano Lett. 2018 Aug 8;18(8):4891-4899. doi: 10.1021/acs.nanolett.8b01529. Epub 2018 Jul 9.
In this paper, lithium hexaoxotungstate (LiWO) nanowires were synthesized via facile solid-state reaction and were tested for CO capture applications at both low (<100 °C) and high temperatures (>700 °C). Under dry conditions, the nanowire materials were able to capture CO with a weight increment of 12% in only 60 s at an operating temperature of 710 °C. By contrast, under humidified ambience, LiWO nanowires capture CO with weight increment of 7.6% at temperatures as low as 30-40 °C within a time-scale of 1 min. It was observed that the CO chemisorption in LiWO is favored in the oxygen ambience at higher temperatures and in the presence of water vapor at lower temperatures. Nanowire morphology favors the swift lithium supply to the surface of lithium-rich LiWO, thereby enhancing the reaction kinetics and lowering time scales for high capacity adsorption. Overall, high chemisorption capacities, superfast reaction kinetics, wide range of operating temperatures, and reasonably good recyclability make 1-D LiWO materials highly suitable for various CO capture applications.
本文通过简便的固态反应合成了六钨酸锂（LiWO）纳米线，并测试了其在低温（<100°C）和高温（>700°C）下的 CO 捕获应用。在干燥条件下，纳米线材料在 710°C 的操作温度下仅 60 秒即可增重 12%来捕获 CO。相比之下，在潮湿的环境中，LiWO 纳米线在 30-40°C 的温度下可在 1 分钟内实现增重 7.6%来捕获 CO。结果表明，在更高的温度下，LiWO 中的 CO 化学吸附在含氧环境中更有利，而在较低的温度下，在水蒸气存在的情况下更有利。纳米线形态有利于富锂 LiWO 表面的锂离子快速供应，从而提高反应动力学并降低高容量吸附的时间尺度。总的来说，高化学吸附容量、超快的反应动力学、宽操作温度范围以及相当良好的可回收性使得一维 LiWO 材料非常适合各种 CO 捕获应用。
