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Two-dimensional (2D) composites with characteristics of high conductivity, good redox activity and large microporosity are constructed via sandwiching reduced graphene oxide (rGO) nanosheets with conjugated microporous polymers (CMPs) containing built-in redox-active ferrocene moieties. The integration of redox-active CMPs and conductive rGO within a 2D porous framework gives rise to remarkable faradaic energy storage as well as fast charge/energy transfer between the electrode and the electrolyte. As a result, the supercapacitors fabricated with these 2D hybrids possess remarkable capacitance at varied current density and excellent cycling stability. Thanks to the structural flexibility of CMPs, this strategy opens an avenue towards the design of new-generation supercapacitors and other electrochemical devices with molecular accuracy. [ABSTRACT FROM AUTHOR]

To realize selective separation of important small molecules in organic solvents with high permeability is highly desired but not attained yet, because it requires stringent control over selectivity in nanofiltration membranes. Here, a thiophene‐containing conjugated microporous polymer membrane, in which the pore size is finely tuned at the angstrom scale through postoxidation of the thiophene moieties, is reported. The successful modification is confirmed by Fourier transform infrared spectroscopy, X‐ray photoelectron spectroscopy, and water contact angle, leading to obvious pore size reduction evidenced by nitrogen adsorption. Upon postmodification, the selectivity of the membrane can be effectively controlled. In the pristine membrane, the methanol permeance reaches 32 liters per square meter per hour per bar (L m−2 h−1 bar−1) with a molecular weight cut‐off (MWCO) of 800 g mol−1. Significantly, after in situ postmodification of thiophene moieties, the largest pore size is reduced from 1.73 to 1.48 nm, giving rise to a remarkable decrease of MWCO from 800 to 500 g mol−1, while the permeance of methanol still maintains as high as 21 L m−2 h−1 bar−1. [ABSTRACT FROM AUTHOR]