In this work, a phosphine‐based covalent organic framework (Phos‐COF‐1) is successfully synthesized and employed as a template for the confined growth of broad‐scope nanoparticles (NPs). Ascribed to the ordered distribution of phosphine coordination sites in the well‐defined pores, various stable and well‐dispersed ultrafine metal NPs including Pd, Pt, Au, and bimetallic PdAuNPs with narrow size distributions are successfully prepared as determined by transmission electron microscopy, X‐ray photoelectron spectroscopy, inductively coupled plasma, and powder X‐ray diffraction analyses. It is also demonstrated that the as‐prepared Phos‐COF‐1‐supported ultrafine NPs exhibit excellent catalytic activities and recyclability toward the Suzuki–Miyaura coupling reaction, reduction of nitro‐phenol and 1‐bromo‐4‐nitrobenzene, and even tandem coupling and reduction of p‐nitroiodobenzene. This work will open many new possibilities for preparing COF‐supported ultrafine NPs with good dispersity and stability for a broad range of applications.

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Two-dimensional porous organic polymers (POPs) can offer overlapped π electron clouds between the stacked layers, conjugated skeletons, and multiple high-rate charge carriers transport pathways that include open channels with variable environments. However, in bulk POPs, the active sites tend to be deep-buried and only a small fraction of them could be electrochemically accessible, limiting their corresponding performance. Herein, solvothermal synthesis of phosphine-based POP (Phos-POP, denoted as PP) and rGO aerogel composites (denoted as PPrGOs) is reported where uniform nanosheets of PP can be rapidly grown on rGO aerogel. An asymmetric supercapacitor (ASC) device based on PPrGO-2 cathode and activated carbon (AC) anode can be operated in a wide potential window up to 1.6 V and achieves high cycling stability (88% retained after 12000 cycles) even at a high current density of 7 A g −1 . Encouragingly, our ASC device delivers a high energy density of 33.3 Wh kg −1 with a power density of 3996 W kg −1 , remaining an exceptionally high power density of 8370 W kg −1 with the downfall of the energy density of 9.3 Wh kg −1 , disclosing outstanding capacitive performance. Furthermore, the two-electrode ASC device could light up a red LED for ∼30 s after charging, implying its promising prospect for future energy storage devices. This work provides a way to further enhance the electrochemical performance of POPs based electrode for high-performance SCs.

A pristine, redox-active triphenylstibine based COF (Sb-COF) exhibits well-uniform nanostructures which could provide sufficient electron conduction pathways and minimize the ion transport lengths, making triphenylstibine moieties readily accessible by the...