Solvent systems for carbon dioxide capture and methods of making and using said systems

A method for preparing an amine-based solvent configured to improve stability of carbamate during carbon dioxide capture, the method comprising:

• modifying at least one cyclic amine molecule by at least one of an intramolecular site structure modulation and an intermolecular site structure modulation to provide the amine-based solvent such that a first molecular site of the at least one cyclic amine molecule is configured to be protonated and a second molecular site of the at least one cyclic amine molecule is configured to hold carbon dioxide as carbamate, wherein the modification of the at least one cyclic amine further comprises:
• adding a methyl group to an alpha position for the first molecular site to be protonated and removing a methyl group from an alpha position for the second molecular site to hold carbon dioxide as carbamate;
• or
• moving a methyl group from an alpha position to a 1-position for the first molecular site to be protonated and removing a steric hindrance on a N site for the second molecular site to hold carbon dioxide as carbamate.