Superior energy density and exceptional cycling stability of conducting polymer-based flexible all-solid-state supercapacitors have been successfully achieved.

It was well established that microwave radiation was utilized initially to enhance the electrical conductivity of polymer nanocomposites (PNCs) by introducing carbon nanotubes (CNTs) without using any solvent. High electrical conductivity was obtained in polypropylene (PP) nanocomposites with low CNTs loading levels. Under an inert gas protection, the CNTs were heated through the transformation of electromagnetic energy into mechanical vibrations. The surface of PP was easily molten by the heat generated by CNTs, then a well-formed CNTs network was built under proper microwave treatment period and subsequent hot pressing. CNTs loading levels and processing temperatures played an important role in the crystal structure, crystalline fraction and crystallization temperature of both nest PP and its PP/CNT PNCs. Moreover, the pressing temperature and CNT loading levels had an obvious effect on the electrical conductivity, which were the main factors on network formation. Electron transport with a three-dimensional route was observed from the study of the variable range hopping (VRH) mechanistic. The unique negative magnetoresistance (MR) phenomenon was shown in the PNCs and theoretically discussed by the forward interference model. The calculated optical band-gap of PNCs decreased with increasing the CNT loading. Other properties have been also well tested and analyzed.

Metal–organic frameworks (MOFs) with plenty of active sites and high porosity have been considered as an excellent platform for the electroreduction of CO2, yet they are still restricted by the low conductivity or low efficiency. Herein, we insert the electron-conductive polypyrrole (PPy) molecule into the channel of MOFs through the in situ polymerization of pyrrole in the pore of MOF-545-Co to increase the electron-transfer ability of MOF-545-Co and the obtained hybrid materials present excellent electrocatalytic CO2RR performance. For example, FECO of PPy@MOF-545-Co can reach up to 98% at −0.8 V, almost 2 times higher than that of bare MOF-545-Co. The high performance might be attributed to the incorporation of PPy that can serve as electric cables in the channel of MOF to facilitate electron transfer during the CO2RR process. This attempt might provide new insights to improve the electrocatalytic performance of MOFs for CO2RR.

Herein we report a facile mechanochemical synthesis of 2D aromatic polyamides (2DAPAs) under solvent-free and room temperature conditions for the first time. The solvent-free conditions are found to be key to the successful synthesis of 2DAPAs. These micrometer-size 2DAPAs have ultrathin graphene-like structures and are highly crystalline, solvent dispersible and thermally stable up to 400 °C.

porosity to support sufficient air exchange. The current clinical approach employed for wound bacterial infection treatment is to apply antibiotics-based wound dressing, which is costly, inefficient, and may lead to antibiotic resistance. [4] Bacterial cellulose (BC), biosynthesized by microorganism fermentation with acetic acid bacteria such as Komagataeibacter sucrofermentans, possesses superior features including high safety, high permeability, high waterholding capacity, excellent flexibility adaptability, low cost, outstanding biocompatibility, and biodegradability. [5] Taking these advantages, BC has been widely applied in artificial skin and blood vessels, scaffolds for tissue engineering, bone regeneration, dental implants, and wound care products. [6] Among these applications, BC is especially suitable for wound dressing because of its 3D coherent nanofiber network structure, leading to ultrahigh porosity and water-holding ability. [6c,7] BC in its natural state does not display any intrinsic antimicrobial capacity, but it can be functionalized with antibacterial agents to realize the infection prevention feature during the wound healing process. [8] Different antibacterial agents such as silver or gold nanoparticles, antibiotics, and chitosan have been attached to BC through physical coating or chemical modification. [9] The physical coating method only requires a moderate modification condition but suffers from shedding of antibacterial moieties from time to time. [10] BC is a natural biopolymer chain composed of β-d-glucose units formed from β-1,4glycosidic bonds. [11] Due to its strong hydrogen bonding and polarizability, BC has poor solubility in conventional organic solvents or water, which often leads to low reaction efficiency for chemical modification. [12] Biosynthesis design for BC by microorganism fermentation has been a new alternative technique that may potentially overcome the limitations of physical coating and chemical modification. [13] Ideally, antibacterial agents could be firmly incorporated into BC during the fermentation process. However, incorporation of an antibacterial agent on BC via microbial biosynthesis is challenging because conventional antibacterial agents could kill the fermentation microorganism. Photosensitizers (PSs), as a class of promising candidates for antibacteria, have no toxicity under dark, but can selectively generate reactive oxygen species (ROS) to induce pathogen lethal injury under light irradiation. [14] Of particular interest are the PSs with aggregationinduced emission characteristics (AIE PSs), which have unique Living materials based on bacterial cellulose (BC) represent a natural and promising candidate for wound dressing. Both physical adsorption and chemical methods have been applied to BC for realizing antibacterial function. However, effective and long-lasting incorporation of bactericidal moieties to BC remains challenging. Herein, a Komagataeibacter sucrofermentans-based direct synthetic method to fabricate photosensitizer-grafted BC thr...