Boron and nitrogen co-doped carbons (BNCs) were fabricated by the activation of boric acid with waste coffee grounds. The sequential hydrothermal and pyrolysis treatments not only create the porous carbons, but also introduce B- and N-contained functional groups into the frameworks. Porous BNCs can effectively adsorb imidazolium-based ionic liquids, which then in situ polymerized in the channels of BNCs. The heterogeneous PIL@BNC composites were formed by the integration of linear poly(ionic liquid)s (PILs) and BNCs. The composites exhibited excellent catalytic performance for CO₂ cycloaddition reaction of epoxide at atmospheric pressure and low temperature. The flexibility of PILs and acid-base sites of BNCs facilitate the cooperative catalysis. Meanwhile, the interactions between electron-rich BNCs and PIL cations can enhance the catalytic activity and stability. This study highlights electron-rich porous carbon is a versatile platform for linear PILs to construct multifunctional heterogeneous catalysts towards CO₂ conversion.

硼和氮共掺杂碳（BNCs）是通过用废咖啡渣活化硼酸来制造的。连续的水热和热解处理不仅产生多孔碳，而且还将含 B 和 N 的官能团引入框架中。多孔 BNCs 可以有效吸附基于咪唑鎓的离子液体，然后在 BNCs 的通道中原位聚合。异质 PIL@BNC 复合材料是通过线性聚（离子液体）（PIL）和 BNC 的集成形成的。复合材料对CO ₂表现出优异的催化性能环氧化物在常压和低温下的环加成反应。PILs 的灵活性和 BNCs 的酸碱位点有利于协同催化。同时，富电子BNCs和PIL阳离子之间的相互作用可以提高催化活性和稳定性。该研究强调富电子多孔碳是线性 PIL 构建多功能非均相催化剂以实现 CO ₂转化的通用平台。