 This paper examined the effectiveness of diethanolamine, DEA, on supported polyethyleneamine, PEI, for carbon dioxide, CO2, capture. It was found that mixing DEA with PEI increased the CO2 uptake by 46% while maintaining the same level of performance at subambient temperatures, minus 5 to 25 degrees Celsius. Additionally, the mixed DEA slash PEI showed faster desorption kinetics at temperatures as low as 70 degrees Celsius, resulting in higher average CO2 working capacity of 1.29 mol G1. This article was authored by Iham Yao, Yao Zhu Wang, Bing Yao Gu, and others.