| Summary: | In this work, N/O codoped porous carbons (NOPCs) were derived from corn silk accompanied by Na<sub>2</sub>CO<sub>3</sub> activation. The porous structures and surface chemical features of as-prepared carbon materials were tailored by adjusting the Na<sub>2</sub>CO<sub>3</sub> mass ratio. After activation, the optimized sample (NOPC1) with abundant ultramicropores and pyrrolic N displays an enhanced CO<sub>2</sub> adsorption capacity of 3.15 mmol g<sup>−1</sup> and 1.95 mmol g<sup>−1</sup> at 273 K and 298 K at 1 bar, respectively. Moreover, this sample also exhibited high IAST selectivity (16.9) and Henry’s law selectivity (15.6) for CO<sub>2</sub>/N<sub>2</sub> at 298 K as well as moderate heat adsorption. Significantly, the joint effect between ultramicropore structure and pyrrolic N content was found to govern the CO<sub>2</sub> adsorption performance of NOPCs samples.
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