Abstract
Ionic liquids and poly(ionic liquid)s have been successfully converted into nitrogen-doped porous carbons with tunable surface area up to 1200 m2/g at high temperatures in air. Compared to conventional carbonization process conducted under inert gas to produce nitrogen-doped carbons, the new production method was completed in a rather shorter time without noble gas protection.
Highlights
Carbonization is typically a high-temperature reaction converting organic substances into carbon-rich products through pyrolysis or destructive distillation [1–19]
Physcial confinement has been applied in industrial carbonization processes carried out in sealed chambers, where oxygen is first quickly consumed by the carbon precursors, and it becomes a process protected by the remaining N2
We discussed and demonstrated the feasibility of producing nitrogen-doped porous carbons straightforwardly in air without protection gas or confinement by using Ionic liquids (ILs)/PIL here as an example. The success of this unique production mode is attributed to the high nitrogen content in the IL/PIL cation and a self-templating mechanism due to the large-sized anion
Summary
Carbonization is typically a high-temperature reaction converting organic substances into carbon-rich products through pyrolysis or destructive distillation [1–19]. This process is ideally (though not necessarily) conducted under inert atmosphere, such as N2 or Ar, because air at high temperature may quickly oxidize the carbons formed in situ into gaseous compounds, like CO or CO2, leading to degradation of the carbon products. Challenging is producing porous carbons in air, as the amplified surface contact accelerates the aerobic degradation. It is a matter of scientific curiosity whether one can produce porous carbons in the presence of air. Our interest here is to discuss the production of porous carbons with the presence of air throughout the carbonization process
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