A two‐dimensional (2D) sp2‐carbon‐linked conjugated polymer framework (2D CCP‐HATN) has a nitrogen‐doped skeleton, a periodical dual‐pore structure and high chemical stability. The polymer backbone consists of hexaazatrinaphthalene (HATN) and cyanovinylene units linked entirely by carbon–carbon double bonds. Profiting from the shape‐persistent framework of 2D CCP‐HATN integrated with the electrochemical redox‐active HATN and the robust sp2 carbon‐carbon linkage, 2D CCP‐HATN hybridized with carbon nanotubes shows a high capacity of 116 mA h g−1, with high utilization of its redox‐active sites and superb cycling stability (91 % after 1000 cycles) and rate capability (82 %, 1.0 A g−1 vs. 0.1 A g−1) as an organic cathode material for lithium‐ion batteries.

A generalized surface-initiated photografting procedure, which utilizes polydopamine as a photosensitive initiating layer, allows functionalization of almost any substrate with thin polymer films under sunlight.

In this work, we report a conceptual strategy for prolonging foliar pesticide retention by using an adhesive polydopamine (PDA) microcapsule to encapsulate avermectin, thereby minimizing its volatilization and improving its residence time on crop surfaces. Polydopamine coated avermectin (Av@PDA) microcapsules were prepared by emulsion interfacial-polymerization and characterized by Fourier transform infrared spectroscopy, energy dispersive X-ray spectroscopy, field-emission scanning electron microscope, and transmission electron microscopy. The in situ synthesis route confers Av@PDA microcapsules with remarkable avermectin loading ability of up to 66.5% (w/w). Kinetic study of avermectin release demonstrated that Av@PDA microcapsules exhibit sustained- and controlled-release properties. The adhesive property of Av@PDA microcapsules on different surfaces was verified by a comparative study between Av@PDA and passivated Av@SiO2 and Av@PDA@SiO2 capsules with silica shell. Moreover, PDA shell could effectively shield UV irradiation and so protect avermectin from photodegradation, making it more applicable for foliar spraying. Meanwhile, it is determinated that Av@PDA microcapsules have good mechanical stability property.

Photoelectrochemical (PEC) water reduction, which can convert solar energy into clean, storable hydrogen fuel, has attracted considerable attention to address energy and environmental issues. [1-3] A PEC water splitting cell is an innovative H 2-production device consisting of solar energy collection (semiconductors) and water electrolysis (catalysts) units. [4-6] Principally, the semiconductors need to comply with several requirements for efficient PEC applications, such as a wide-range light harvesting ability, efficient charge transfer, corrosion stability, and a higher-lying lowest unoccupied molecular orbital (LUMO) energy level than the reduction potential of the proton (H + /H 2). [1,7] 2D covalent organic frameworks (2D COFs), as crystalline, layer-stacked, 2D porous polymers, have emerged as a promi sing class of materials for photocatalysis and PEC applications recently. [3,8-12] Their energy bandgaps, positions of the frontier orbitals, and active centers can be facilely tailored by bottom-up organic synthesis with abundant building blocks, linkages, and topologies. [6,13,14] In particular, 2D π-conjugated COFs, which belong to the class of 2D conjugated polymers, show notable advantages for PEC applications due to the π-stacked columns Photoelectrochemical (PEC) water reduction, converting solar energy into environmentally friendly hydrogen fuel, requires delicate design and synthesis of semiconductors with appropriate bandgaps, suitable energy levels of the frontier orbitals, and high intrinsic charge mobility. In this work, the synthesis of a novel bithiophene-bridged donor-acceptorbased 2D sp 2-carbon-linked conjugated polymer (2D CCP) is demonstrated. The Knoevenagel polymerization between the electron-accepting building block 2,3,8,9,14,15-hexa(4-formylphenyl) diquinoxalino[2,3a:2′,3′-c]phenazine (HATN-6CHO) and the first electron-donating linker 2,2′-([2,2′-bithiophene]-5,5′-diyl)diacetonitrile (ThDAN) provides the 2D CCP-HATNThDAN (2D CCP-Th). Compared with the corresponding biphenyl-bridged 2D CCP-HATN-BDAN (2D CCP-BD), the bithiophenebased 2D CCP-Th exhibits a wide light-harvesting range (up to 674 nm), a optical energy gap (2.04 eV), and highest energy occupied molecular orbital-lowest unoccupied molecular orbital distributions for facilitated charge transfer, which make 2D CCP-Th a promising candidate for PEC water reduction. As a result, 2D CCP-Th presents a superb H 2-evolution photocurrent density up to ≈7.9 µA cm −2 at 0 V versus reversible hydrogen electrode, which is superior to the reported 2D covalent organic frameworks and most carbon nitride materials (0.09-6.0 µA cm −2). Density functional theory calculations identify the thiophene units and cyano substituents at the vinylene linkage as active sites for the evolution of H 2. The ORCID identification number(s) for the author(s) of this article can be found under

A microsupercapacitor with smart thermoresponsive behavior is demonstrated as one potential self-protection solution for on-chip electronic devices.

Sodium (Na) ion batteries are attracting increasing attention for use in various electrical applications. However, the electrochemical behaviors, particularly the working voltages, of Na ion batteries are substantially lower than those of lithium (Li) ion batteries. Worse, the state-of-the-art Na ion battery cannot meet the demand of miniaturized in modern electronics. Here, we demonstrate that electrochemically exfoliated graphene (EG) nanosheets can reversibly store (PF ) anions, yielding high charging and discharging voltages of 4.7 and 4.3 V vs. Na /Na, respectively. The dual-graphene rechargeable Na battery fabricated using EG as both the positive and negative electrodes provided the highest operating voltage among all Na ion full cells reported to date, together with a maximum energy density of 250 Wh kg . Notably, the dual-graphene rechargeable Na microbattery exhibited an areal capacity of 35 μAh cm with stable cycling behavior. This study offers an efficient option for the development of novel rechargeable microbatteries with ultra-high operating voltage and high energy density.

Polyethylene terephthalate (PET) is the most widely used polymer in the world. For the first time, the laser‐driven integration of aluminum nanoparticles (Al NPs) into PET to realize a laser‐induced graphene/Al NPs/polymer composite, which demonstrates excellent toughness and high electrical conductivity with the formation of aluminum carbide into the polymer is shown. The conductive structures show an impressive mechanical resistance against >10000 bending cycles, projectile impact, hammering, abrasion, and structural and chemical stability when in contact with different solvents (ethanol, water, and aqueous electrolytes). Devices including thermal heaters, carbon electrodes for energy storage, electrochemical and bending sensors show this technology's practical application for ultra‐robust polymer electronics. This laser‐based technology can be extended to integrating other nanomaterials and create hybrid graphene‐based structures with excellent properties in a wide range of flexible electronics’ applications.

Avermectin is susceptible to oxidation and photolysis, resulting in instability under UV irradiation and a short half-life. To solve this problem, many materials have been used to prevent the photodegradation of avermectin, but the complexity of the preparation process, the difficultly in biodegradation and the residual organic solvents, hinder their practical application. Fortunately, PDA emerged with negligible toxicity, environmental friendliness, extraordinary biocompatibility, and good adhesion, and it is widely used, especially as an UV-shielding material, which implies its huge potential in pesticides as a preferred candidate to melanin but this has never been reported. Herein, a gentle and flexible approach to the preparation of PDA coated avermectin was developed, to protect avermectin from photodegradation, through the oxidation self-polymerization of dopamine. The thickness of the polymer coating was controlled using a multistep deposition technique. The as-prepared products were used to study the effects of the coating thickness on the controlled-release and the UV-shielding property for avermectin. The results showed that the release rate of avermectin could be tailored using the thickness of the PDA layer. Most importantly, the PDA coating exhibited remarkable UV-shielding properties for avermectin, and the UV protection of the PDA layer for avermectin was improved with the coating getting thicker. Therefore, the system has a promising future in practical applications, so as to achieve sustained release and prevent the photodegradation of pesticides.