Seo et al. (https://doi.org/10.1016/j.jcou.2019.11.011) studied the addition of Ni nanoparticles to MEA based CO2 absorption. Two reactors including microreactor and a long serpentine microchannel were used. The nanoparticles could enhance the catalytic CO2 absorption rate by 34% using the microreactor. However, the long serpentine microchannel reactor could enhance CO2 absorption by 54%. Different MEA concentrations with and without Ni nanoparticles were also investigated. In addition, the authors also studied the compatibility of NiNPs with MEA. Two nice videos are included in the supporting information.