A 2D covalent organic framework with excellent electrical conductivity and a highly conjugated planar skeleton exhibits a markedly high specific capacitance of 1257 F g⁻¹.

One of the challenges in water remediation is adsorbent designing, aiming at low cost and ultrafast contaminant adsorption. Herein, we developed a simple and scalable one-pot synthesis method to achieve a cost-effective anionic hypercrosslinked polymer (AHCP-1) through the Friedel–Crafts reaction with sodium tetraphenylboron as the monomer. To the best of our knowledge, this is the first anionic hypercrosslinked polymer synthesized using the Friedel–Crafts reaction. Notably, AHCP-1 possessed a high specific surface area of 939 m² g⁻¹ with a micro-/mesoporous structure. Owing to the high surface area, the abundant phenyl groups and the built-in ionic charges, AHCP-1 displayed ultrafast adsorption towards dyes and phenolic derivatives, and a high adsorption capacity of 229.89 mg g⁻¹ for RhB and 540.5 mg g⁻¹ for BPA. It is also found that the adsorption behavior is dependent on the pollutant concentration, the pH value, and the structure and charge states of the pollutant molecules.

A 2D covalent organic framework with intramolecular charge transfer, numerous redox-active groups and high electrical conductivity possesses a specific capacitance of 752 F g⁻¹ and an energy density of 57 W h kg⁻¹.

Ultra-stable Pickering emulsions synergistically stabilized by zein nanoparticles and starch nanocrystals were successfully prepared and the stabilization is ascribed to the double-layer shell of binary particles. The as-prepared Pickering emulsions showed unprecedented stability against centrifugation up to 20 000g and against environmental stresses such as pH change and high temperature.