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Solar Hydrogen Production
In article number 2201815, Daniele Benetti, Qin Wei, Federico Rosei, and co‐workers develop a versatile template‐based metal–organic framework (MOF) method to prepare hierarchical NiO/carbon hollow nanostructures that can be used as photocathodes for solar‐driven H2 production. Compared to pure NiO‐based photocathodes, MOF‐templated NiO‐based devices exhibit improved performance...
Bone Regeneration
In article number 2200416, Hojeong Jeon, Justin J. Chung, and co‐workers fabricate complex coacervate of fucoidan and poly‐l‐lysine to prevent bone morphogenetic protein‐2 (BMP‐2) leakage from collagen sponges. The microencapsulation ability of the coacervate significantly enhances BMP‐2 bioactivity and provides protection against antagonist and proteolysis. Moreover, the BMP‐2...
Endometriosis Treatment
In article number 2107808, Ov D. Slayden, Oleh Taratula, and co‐worker develop an endometriosis therapy based on targeted magnetic nanoparticles that efficiently accumulate in endometriotic lesions following systemic administration, and specifically eradicate the disease by generating therapeutic temperatures inside the lesions upon exposure to an external alternating magnetic...
Energy Harvesting
In article number 2200184, Yong Soo Cho and co‐workers successfully apply an interdigitated electrode for a centimeter‐scale monolayer MoS2 film having preferred domain structure, without a complicated etching or e‐beam lithography process. The fabricated device exhibits superior piezoelectric energy harvesting performance with 400.4 mV and 40.7 nA.
Lead‐free Cs2AgBiBr6 double perovskite is considered to be a promising alternative to the traditional lead‐based analogues due to its long carrier lifetime, high structural stability, and non‐toxicity. However, the large band gap limits its absorption of visible light, which is not conducive to further optoelectronic applications. Herein, a thermochromic strategy is reported to decrease the band gap...
Reported herein is a highly active and durable hydrogen evolution reaction (HER) electrocatalyst, which is constructed following a tandem interface strategy and functional in alkaline and even neutral medium (pH ≈ 7). The ternary composite material, consisting of conductive nickel foam (NF) substrate, Ni3S2‐MoS2 heterostructure, and TiO2 coating, is synthesized by the hydrothermal method and atomic...
Electrically accelerated self‐healable poly(ionic liquids) copolymers that exhibit resistor‐capacitor (RC) circuit properties are developed. At low alternating current (AC) frequencies these materials behave as a resistor (R), whereas at higher frequencies as a capacitor (C). These properties are attributed to a combination of dipolar and electrostatic interactions in (1‐[(2‐methacryloyloxy)ethyl]‐3‐butylimidazolium...
Ultralight and highly flexible aerogel sensors, composed of reduced graphene oxide cross‐linked by sustainable‐macromolecule‐derived carbon, are prepared via facile freeze‐drying and thermal annealing. The synergistic combination of cross‐linked graphene nanosheets and micrometer‐sized honeycomb pores gives rise to the exceptional properties of the aerogels, including superior compressibility and...
All‐Solid‐State Thin‐Film Batteries
In article number 2201134, Dong‐Hwa Seo, Hyun‐Suk Kim, and co‐workers demonstrate cation (Ni and Mn)‐ordering effects using thin‐film LiNi0.5Mn1.5O4 cathode materials with or without oxygen vacancies. The authors explain that cations order changes from a disordered structure to an ordered structure with increased oxygen (O2) flow rate (Ar:O2 flowing) during sputter...
Germanium (Ge)‐based devices are recognized as one of the most promising next‐generation technologies for extending Moore's law. However, one of the critical issues is Fermi‐level pinning (FLP) at the metal/n‐Ge interface, and the resulting large contact resistance seriously degrades their performance. The insertion of a thin layer is one main technique for FLP modulation; however, the contact resistance...
Due to their characteristics of high capacity and appropriate potassiation/depotassiation potential, Sb‐based materials have become a class of promising anode materials for potassium ion batteries (PIBs). However, the huge strain induced by potassiation/depotassiation limits their ability to periodically accept/release K+. Herein, a composite with FeSb2 nanoparticles embedded in a 3D porous carbon...
The authors report the growth of micrometer‐long single‐crystal graphene ribbons (GRs) (tapered when grown above 900 °C, but uniform width when grown in the range 850 °C to 900 °C) using silica particle seeds on single crystal Cu(111) foil. Tapered graphene ribbons grow strictly along the Cu<101> direction on Cu(111) and polycrystalline copper (Cu) foils. Silica particles on both Cu foils form...
Nanoparticles (NPs) grafted with highly dense DNA strands are termed as spherical nucleic acids (SNAs), which have important applications benefiting from various unique properties unpossessed by naturally occurring nucleic acids. To overcome existing challenges toward an ideal SNA synthesis, herein, a very simple, while highly effective evaporative drying strategy featuring various long‐desired advantages,...
The intrinsic sluggish kinetics of the oxygen evolution reaction (OER) limit the improvement of hydrogen evolution reaction (HER) performance, and substituting the anodic oxidation of biomass materials is an alternative approach, given its lower oxidation potential and higher added value compared to those of OER. In this study, a Ni3S2‐MoS2 nanoheterojunction catalyst with strong electronic interactions...
The precursors of functional biomolecules in living cells are synthesized in a bottom‐up manner and subsequently activated by modification into a delicate structure with near‐atomic precision. DNA origami technology provides a promising way to mimic the synthesis of precursors, although mimicking the modification process is a challenge. Herein, a DNA paper‐cutting (DNA kirigami) method to trim origami...
As an emerging energy‐harvesting technology, the triboelectric nanogenerator (TENG) is considered a powerful driving force toward the new‐era of Internet of Things and artificial intelligence, but its output performance is dramatically influenced by environmental humidity. Herein, a direct current TENG (DC‐TENG) based on the triboelectrification effect and electrostatic breakdown is reported to address...
Deficiencies in understanding the local environment of active sites and limited synthetic skills challenge the delivery of industrially‐relevant current densities with low overpotentials and high selectivity for CO2 reduction. Here, a transient laser induction of metal salts can stimulate extreme conditions and rapid kinetics to produce defect‐rich indium nanoparticles (L‐In) is reported. Atomic‐resolution...
Nickel oxide (NiO) is a promising p‐type material for a wide range of optoelectronic devices, as well as photocathode for photoelectrochemical (PEC) water splitting. However, traditional NiO photoelectrodes exhibit a wide bandgap (3.6 eV), intrinsic poor electrical conductivity, and low surface area, leading to low PEC systems performance. Herein, the authors explore a Ni‐based metal–organic framework...
The utilization of azobenzene‐based photoisomerization cannot only control the morphology of supramolecular assemblies, but can also regulate many biological processes. However, the design of azobenzene‐involved nanoconstructs with switchable photoluminescence remains challenging because of the light‐quenching ability of azobenzene. Herein, an azobenzene‐derived multicomponent nanosystem is reported...
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