Preparation of Nitrogen-Doped Porous Carbon and its Water Adsorption Behaviour

Abstract

In this study, nitrogen-doped porous carbons were prepared by high-temperature carbonization of resorcinol-formaldehyde cryogels, which were synthesized with nitrogen precursor (either urea or melamine) added during the synthesis. The pore structure of the resulting carbon was found to depend on the nitrogen precursor added and its concentration. To quantify the extent of the surface hydrophilicity, which is due to the effect of nitrogen doping, we carried out water adsorption at 298 K, and found that the adsorbed amount of water is proportional to the nitrogen content over the low-pressure region (P/P0 < 0.3). In addition, this amount correlated with the pore structure in the intermediate and high-pressure regions. The adsorption isotherms were analyzed with the Horikawa-Do model to quantify the amount of nitrogen doped during water adsorption.

Nitrogen-Doped Unusually Superwetting, Thermally Insulating, and Elastic Graphene Aerogel for Efficient Solar Steam Generation

“…Hao et al reported that N-doping promoted hydrogen bonding between water molecules and doped carbon surfaces . N-doping has also been found to reduce the hydrophobicity of graphene in applications to electrochemistry and water-harvesting. , However, contradictory phenomena and diverging conclusions remain unsolved for the role of nitrogen doping in the surface wettability of carbon aerogels, where some researchers found the N-doped carbon aerogels hydrophobic, , while others reported that N-doped carbon aerogels could be hydrophilic. ,, The effect of N-doping on the wettability of carbon-based aerogels requires further study. A superwetting and mechanically robust photothermal material based on carbon aerogels with surface heterogeneity has not yet been achieved to the best of our knowledge.…”

“…43 N-doping has also been found to reduce the hydrophobicity of graphene in applications to electrochemistry 44 and water-harvesting. 43,45 However, contradictory phenomena and diverging conclusions remain unsolved for the role of nitrogen doping in the surface wettability of carbon aerogels, where some researchers found the N-doped carbon aerogels hydrophobic, 16,46 while others reported that N-doped carbon aerogels could be hydrophilic. 10,43,45 The effect of N-doping on the wettability of carbon-based aerogels requires further study.…”

Nitrogen-Doped Microporous Carbons Synthesized from Indole-Based Copolymer Spheres for Supercapacitors and Metal-Free Electrocatalysis

“…As evident from Table 2, the percentage of nitrogen content decreases gradually with higher KOH activation since KOH converts the heteroatoms to their gaseous oxides. 47 While ITS-2-800 has the lowest nitrogen content, ITS-2-900 has the highest nitrogen content of 3.8%.…”

Effect of nitrogen doping on the electrochemical performance of resorcinol-formaldehyde based carbon aerogels as electrode material for supercapacitor applications

“…As seen, the introduction of nitrogen in the bulk of the carbon used as the electroactive material improves the capacitive performance of the electrochemical capacitor cell with the highest specific capacitance obtained for the nitrogen doped carbon aerogel with an R/M ratio of 80. This can be due to the improvements in physical properties of carbon material, including its conductivity, wettability, and pseudocapacitive charge storage ability induced by doping of nitrogen combined with its double layer capacitive charge storage ability because of its high surface area [39,46,47].…”