Unusual Ultra‐Hydrophilic, Porous Carbon Cuboids for Atmospheric‐Water Capture

Abstract

There is significant interest in high-performance materials that can directly and efficiently capture water vapor, particularly from air. Herein, we report a class of novel porous carbon cuboids with unusual ultra-hydrophilic properties, over which the synergistic effects between surface heterogeneity and micropore architecture is maximized, leading to the best atmospheric water-capture performance among porous carbons to date, with a water capacity of up to 9.82 mmol g(-1) at P/P0 =0.2 and 25 °C (20% relative humidity or 6000 ppm). Benefiting from properties, such as defined morphology, narrow pore size distribution, and high heterogeneity, this series of functional carbons may serve as model materials for fundamental research on carbon chemistry and the advance of new types of materials for water-vapor capture as well as other applications requiring combined highly hydrophilic surface chemistry, developed hierarchical porosity, and excellent stability.

Understanding the Charge Storage Mechanism to Achieve High Capacity and Fast Ion Storage in Sodium‐Ion Capacitor Anodes by Using Electrospun Nitrogen‐Doped Carbon Fibers

“…As zeolites are known for their strong interaction with alkali metal ions, it is not surprising that highly polar HAT‐CNFs show high adsorption capacity for sodium. For example, the 420 mAh g −1 capacity of HAT‐CNF‐700 would translate to a sodium adsorption capacity of 15.7 mmol Na g −1 —a value that nicely compares to the water adsorption capacity of such materials 16c,25. Assuming an overall stoichiometry of HAT‐CNF‐700 of C 0.87 N 0.13 (based on the EA data), the nitrogen content of ≈10.6 mmol N g −1 is apparently closely related to the sodium storage capacity.…”

Tunable Water and CO2 Sorption Properties in Isostructural Azine-Based Covalent Organic Frameworks through Polarity Engineering

“…Overall, while the water vapor uptake behavior of ATFG-COF is similar to hydrophilic charcoals with a moderate uptake at low pressures, AB-COF exceeds most carbon-based water sorbents with an ultra-high uptake of 15.2 mmol g -1 at p p 0 ¬1 = 0.26. 38 The hydrophilicity of each network can easily be compared by analyzing the heats of adsorption Q st which were calculated with the help of the Clausius−Clapeyron equation.…”

“…We further find that AB-COF with its distinct S-shape adsorption profile exhibits extremely high water uptake capacities already at low pressures, which is, to our knowledge, among the highest at pressures < 0.3 p p 0 -1 for all carbon-based porous materials. 38 This renders AB-COF an intriguing candidate for atmospheric water capture and release in arid climates, e.g. in deserts.…”

Improved CO2 Uptake and Supercapacitive Energy Storage Using Heteroatom‐Rich Porous Carbons Derived from Conjugated Microporous Polyaminoanthraquinone Networks

“…Porous carbon materials exhibit unique structural features such as large surface area and physicochemical stability and have been of significant interest to CO 2 capture and supercapacitive energy storage . Also, conjugated microporous polymers (CMPs) consisting of an extended π‐conjugation and inherent nanopores are a new class of porous materials with three‐dimensional networks, showing promise in applications such as gas capture and separation, chemosensors, heterocatalysis, and energy storage .…”