Carbon-carbon composite sorbent formulations for carbon dioxide adsorption, and related methods

A carbon-carbon composite sorbent for removal of carbon dioxide from a gaseous material, the carbon-carbon composite sorbent comprising:

• a base material including a mesoporous carbon material including pores having an average diameter within a range of from about 2 nm to about 50 nm;
• and
• an adsorption material on surfaces of the base material and surfaces defining the pores of the base material, the adsorption material having a different material composition than the base material, a nitrogen content of the adsorption material, exclusive of hydrogen, within a range of from about 2.0 atomic percent to about 3.0 atomic percent,
• wherein the adsorption material includes:
• a carbon content, exclusive of hydrogen in the adsorption material, within a range of from about 85.0 atomic percent to about 95.0 atomic percent;
• and
• an oxygen content, exclusive of hydrogen in the adsorption material, within a range of from about 2.0 atomic percent to about 8.0 atomic percent,
• wherein the adsorption material has a higher nitrogen content than the base material and includes greater than about 2.0 atomic percent nitrogen exclusive of hydrogen in the adsorption material, a nitrogen content of the carbon-carbon composite sorbent within a range of from about 0.20 atomic percent to about 1.0 atomic percent.

A carbon-carbon composite sorbent for removal of carbon dioxide from a gaseous material, the carbon-carbon composite sorbent comprising:

• a base material including a mesoporous carbon material including pores having an average diameter within a range of from about 2 nm to about 50 nm;
• and
• an adsorption material on surfaces of the base material and surfaces defining the pores of the base material, the adsorption material having a different material composition than the base material, a nitrogen content of the adsorption material, exclusive of hydrogen, within a range of from about 2.0 atomic percent to about 3.0 atomic percent,
• wherein the adsorption material includes one or more of pyridine groups, pyrrole groups, or pyrone groups,
• wherein the base material is substantially free of pyridine groups, pyrrole groups, or pyrone groups,
• wherein the adsorption material has a higher nitrogen content than the base material and includes greater than about 2.0 atomic percent nitrogen exclusive of hydrogen in the adsorption material, a nitrogen content of the carbon-carbon composite sorbent within a range of from about 0.20 atomic percent to about 1.0 atomic percent.