One-step, template-free synthesis of highly porous nitrogen/sulfur-codoped carbons from a single protic salt and their application to CO₂ capture

Abstract

Traditional methods of preparing highly porous, nitrogen/sulfur-codoped carbons require either template-based tedious, time-consuming procedures or harsh chemical/physical activation process. In this paper, we report a very facile method to prepare such carbons via the direct carbonization of a single protic salt, prop-2-en-1-aminium hydrogensulfate, in the absence of any hard/soft template or activation agent. Depending on the carbonization temperatures, the obtained carbons exhibited tunable structures and properties, in terms of their morphologies, surface areas, pore structures, and chemical compositions. Particularly, the carbon material obtained at 1000 °C showed a very large surface area (1149 m 2 /g), even comparable to that of traditionally activated carbon. Among all the samples, the carbon obtained at 900 °C , exclusively having a narrowly distributed microporous structure, exhibited a significant CO2 uptake of 2.58 mmol/g at 298 K and 1 atm. This carbon could also be easily regenerated and reused without any evident loss of CO2-adsorption capacity.

Constructing Hierarchically Porous N-Doped Carbons Derived from Poly(ionic liquids) with the Multifunctional Fe-Based Template for CO2 Adsorption

“…Elemental analyses were performed to access the element compositions of the carbon materials in this work, especially N content, which was beneficial to CO 2 capture. 47 − 49 As shown in Table 1 , a common tendency of the decreasing N content from 16.84 to 1.87 wt % with the increasing pyrolysis temperature for carbon samples NDPC-1- y was observed. Among them, the N content of NDPC-1-800 was much lower than that of NDC-800, mainly due to the utilization of hydrochloric acid when removing templates.…”

Nano-casted N-Doped Carbon Created From a Task-Specific Protic Salt and Controlled Porous Glass

“…The G, D1, D3, and D4 Raman bands of the carbon replicas before and after heat-treatment were fitted in the ranges specified by Coccato et al (2015) and Zhang et al (2015c). D5-band positioned between 1,599 and 1,635 cm −1 was not fitted because of its virtual indistinguishability with G-band.…”

“…Before the heat treatment of the inverse carbon replica, a hierarchical carbonaceous material with micro-, meso-, and macroporosity was created, as proved by the N 2 sorption results depicted in Figure 4. Such a material with high surface area and high nitrogen content could find application in CO 2 capture (D'Alessandro et al, 2010; Zhang et al, 2015c).…”

Design and Materialization of Ionic Liquids Based on an Understanding of Their Fundamental Properties

“…166,167 Resulting from a detailed investigation of the relationship between the precursor structures and the resulting carbon materials, 167 it has become possible to prepare N-doped carbons with controllable N content, 168 and high surface areas with controllable pore structures with or without the use of hard templates. 171 The resulting N-doped carbons exhibit very interesting properties, such as high O 2 reduction activity, 170,172 high CO 2 adsorption capability, 171,173 and high electric double layer capacitance. 170 These low-cost and versatile precursors are promising building blocks for new carbon materials.…”

“…[166][167][168][169][170][171][172][173] Instead of using traditional polymer precursors and complex procedures to prepare N-doped carbons, easily prepared and widely obtainable nitrogencontaining protic ILs/protic salts are used as novel small molecule precursors for the preparation of carbon materials via direct carbonization, without any other treatment (Fig. 14).…”