Stimulus-responsive adsorbent materials exhibit tunable CO2 capture and separation performance in response to pressure, temperature, light, electric field, magnetic field, guest molecules, pH, and redox.

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An optimized approach to producing lattice‐matched heterointerfaces for electrocatalytic hydrogen evolution has not yet been reported. Herein, we present the synthesis of lattice‐matched Mo2C−Mo2N heterostructures using a gradient heating epitaxial growth method. The well lattice‐matched heterointerface of Mo2C−Mo2N generates near‐zero hydrogen‐adsorption free energy and facilitates water dissociation in acid and alkaline media. The lattice‐matched Mo2C−Mo2N heterostructures have low overpotentials of 73 mV and 80 mV at 10 mA cm−2 in acid and alkaline solutions, respectively, comparable to commercial Pt/C. A novel photothermal‐electrocatalytic water vapor splitting device using the lattice‐matched Mo2C−Mo2N heterostructure as a hydrogen evolution electrocatalyst displays a competitive cell voltage for electrocatalytic water splitting.

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Porous boron nitride (BN) membranes PBN-BH, PBN-BNH, and PBN-NH were designed as promising membranes for purifying He from natural gas by using density functional theory. The three BN membranes were precisely regulated to form suitable pore sizes with high stability for He separation. The PBN-BH membrane exhibited ultrahigh selectivities of He over Ne, Ar, N2, CO2, and CH4, which were approximately 106–1066 times larger than those of the two other structures. Among the three membranes, PBN-BH exhibited the highest He selectivity over CH4 of 5 × 1079 at 300 K, far better than previously reported findings. With the shortened B–H bond, PBN-NH presented unexceptionable He permeances of >0.23 mol m–2 s–1 Pa–1 at 300 K. The most stable adsorption configurations and their corresponding adsorption energies confirmed that weak van der Waals interactions dominated between the gases and the porous BN membranes. The minimum energy pathways, energy profiles, and electron density isosurfaces were analyzed to elucidate the significant impact of precise pore size on the selectivities of He over other gases and permeances passing through porous BN membranes.

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Carbon phosphides exhibit high CO2 adsorption capacity and selectivity, excellent humidity resistance, and low energy consumption in external electric fields.