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Organic Light‐Emitting Diodes
In article number 2307393, Gang Cheng, Lei Dai, Chi‐Ming Che, and co‐workers realized operationally stable and high‐performance vapor‐deposited green phosphorescent organic light‐emitting diodes with sterically hindered tetradentate [Pt(O^N^C^N)] emitters. The corresponding Pt‐based devices display EL spectra with full width at half maximum down to 36 nm, high external...
Described here are sterically hindered tetradentate [Pt(O^N^C^N)] emitters (Pt‐1, Pt‐2, and Pt‐3) developed for stable and high‐performance green phosphorescent organic light‐emitting diodes (OLEDs). These Pt(II) emitters exhibit strong saturated green phosphorescence (λmax = 517–531 nm) in toluene and mCP thin films with emission quantum yields as high as 0.97, radiative rate constants (kr) as high...
Superlattice Structures
In article number 2306350, Jun Yang, Kornelius Nielsch, and co‐workers report the thermoelectric performance of SbOx/Sb2Te3 multilayers synthesized via atomic layer deposition. The SbOx layers act as a potential barrier to filter out the low‐energy charge carriers. A remarkable power factor of 520.8 μW m−1 K−2 and low thermal conductivity of 0.4 W m−1 K−1 were obtained.
Nanoscale superlattice (SL) structures have proven to be effective in enhancing the thermoelectric (TE) properties of thin films. Herein, the main phase of antimony telluride (Sb2Te3) thin film with sub‐nanometer layers of antimony oxide (SbOx) is synthesized via atomic layer deposition (ALD) at a low temperature of 80 °C. The SL structure is tailored by varying the cycle numbers of Sb2Te3 and SbO...
Peptide assemblies are promising nanomaterials, with their properties and technological applications being highly hinged on their supramolecular architectures. Here, how changing the chirality of the terminal charged residues of an amphiphilic hexapeptide sequence Ac‐I4K2‐NH2 gives rise to distinct nanostructures and supramolecular handedness is reported. Microscopic imaging and neutron scattering...
Peptide Supramolecular Handedness
In article number 2304424, Hai Xu, Jun Yang, Jiqian Wang, and co‐workers report how changing the chirality of the terminal charged residues of an amphiphilic hexapeptide sequence Ac‐I4K2‐NH2 gives rise to distinct nanostructures and supramolecular handedness. The formation of wide nanotubes arises from the co‐assembly of right‐ and left‐handed β‐strands while thin,...
The lack of acid‐proof high‐potential cathode largely limits the development and competitiveness of proton batteries. Herein, the authors systematically investigated six dihydroxynaphthalenes (DHNs) and found that 2,6‐DHN delivered the best cathode performance in proton battery with the highest redox potential (0.84 V, vs SHE) and a specific capacity of 91.6 mAh g−1 at 1 A g−1. In situ solid‐state...
The significant attraction toward aqueous proton batteries (APBs) is attributable to their expedited kinetics, elevated safety profile, and economical feasibility. Nevertheless, their practical implement is significantly blocked by the unsatisfactory energy density due to the limited cathode materials. Herein, vanadium hexacyanoferrate Prussian blue analog (VOHCF) is introduced as a potentially favorable...
Aqueous alkali‐ion batteries have enormous promise as a kind of safe, reliable, and sustainable energy technologies for power supplies. Although organic molecules with tunable and diverse configurations are potential electroactive materials, their inadequate redox activity and electron affinity hinder the practical application for aqueous alkali‐ion storage. Herein, a novel electron‐withdrawing carboxyl‐substituted...
The development of atomically dispersed iron‐nitrogen‐carbon (Fe─N─C) catalysts as an alternative to precious platinum holds great potential for the substantial progress of a variety of oxygen reduction reaction (ORR)‐associated energy conversion technologies. Nevertheless, the precise synthesis of Fe─N─C single atomic catalysts (SACs) with a high density of accessible active sites and pronounced...
Tungsten oxide (WO3) is an appealing electrocatalyst for the hydrogen evolution reaction (HER) owing to its cost‐effectiveness and structural adjustability. However, the WO3 electrocatalyst displays undesirable intrinsic activity for the HER, which originates from the strong hydrogen adsorption energy. Herein, for effective defect engineering, a hydrogen atom inserted into the interstitial lattice...
Benefiting from the proton's small size and ultrahigh mobility in water, aqueous proton batteries are regarded as an attractive candidate for high‐power and ultralow‐temperature energy storage devices. Herein, a new‐type C4N polymer with uniform micropores and a large specific surface area is prepared by sulfuric acid‐catalyzed ketone amine condensation reaction and employed as the electrode of proton...
Single atoms are superior electrocatalysts having high atomic utilization and amazing activity for water oxidation and splitting. Herein, this work reports a thermal reduction method to introduce high‐valence iridium (Ir) single atoms into bimetal phosphide (FeNiP) nanoparticles toward high‐efficiency oxygen evolution reaction (OER) and overall water splitting. The presence of high‐valence single...
The precise and comprehensive manipulation of the component, size, and geometric nano‐architecture of platinum‐based electrocatalysts into porous and hollow structure can effectively impart the catalysts with substantially improved electrochemical performance, yet remain formidably challenging. Herein, a straightforward fabrication of porous platinum‐copper alloyed nanobowls (abbreviated as Pt3Cu...
Designing affordable and efficient bifunctional electrocatalysts for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) has remained a long‐lasting target for the progressing hydrogen economy. Utilization of metal/semiconductor interface effect has been lately established as a viable implementation to realize the favorable electrocatalytic performance due to the built‐in electric...
Measuring the changes in tumor cell surface temperature can provide insights into cellular metabolism and pathological features, which is significant for targeted chemotherapy and hyperthermic therapy. However, conventional micro–nano scale methods are invasive and can only measure the temperature of cells across a single plane, which excludes specific organelles. In this study, fluorescence quantum...
Lithium–sulfur (Li–S) batteries are facing a significant barrier due to the diffusion of intermediate redox species. Although some S doped covalent framework cathodes have been reported with outstanding reversibility, the low content of sulfur (less than 30%) limits the practical applications. To overcome the issue, the sulfur and nitrogen co‐doped covalent compounds (S‐NC) as a host‐type cathode...
The development of materials with efficient heat dissipation capability has become essential for next‐generation integrated electronics and flexible smart devices. Here, a 3D hybridized carbon film with graphene nanowrinkles and microhinge structures by a simple solution dip‐coating technique using graphene oxide (GO) on polyimide (PI) skeletons, followed by high‐temperature annealing, is constructed...
In article number 1905311, Jun Yang, Yongyao Xia, and co‐workers design an O3‐type layered Ni‐rich oxide cathode through an electrochemical Li+/Na+ exchange strategy. Benefiting from its high‐active and open layered framework for fast ion transport, the Na‐intercalated cathode demonstrates a high reversible capacity and superior rate capability, which has potential applications in the field of large‐scale...
Inspired by its high‐active and open layered framework for fast Li+ extraction/insertion reactions, layered Ni‐rich oxide is proposed as an outstanding Na‐intercalated cathode for high‐performance sodium‐ion batteries. An O3‐type Na0.75Ni0.82Co0.12Mn0.06O2 is achieved through a facile electrochemical ion‐exchange strategy in which Li+ ions are first extracted from the LiNi0.82Co0.12Mn0.06O2 cathode...
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