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Biomolecule‐functionalized nanoparticles represent a type of promising biomaterials in biomedical applications owing to their excellent biocompatibility and versatility. DNA‐based reactions on nanoparticles have enabled emerging applications including intelligent biosensors, drug delivery, and biomimetic devices. Among the reactions, strand hybridization is the critical step to control the sensitivity...
The direct use of mesenchymal stem cells (MSCs) as therapeutics for skin injuries is a promising approach, yet it still faces several obstacles, including limited adhesion, retention, and engraftment of stem cells in the wound area, as well as impaired regenerative and healing functions. Here, DNA‐based self‐assembled composites are reported that can aid the adhesion of MSCs in skin wounds, enhance...
A high‐throughput ion beam sputtering system is used to synthesize compositional gradient superlattice‐like (SLL) thin film libraries of Ge–Sb–Te alloys over the entire phase diagram. The optical properties and structural evolution of the Ge–Sb–Te combinatorial SLL thin film are investigated. A systematic screening over the annealing temperature, annealing time, and modulation period has elucidated...
Oxide Cathodes
In article number 2307419, Jinsong Wu and co‐workers develop a method to improve cyclability of lithium‐rich layered oxides, by trace amount Yb doping. The method induces spontaneously formed Yb and oxygen‐rich layers on the surface, while some Yb dope also into the lattice. The results advance strategy of rare‐earth element doping for lithium‐rich oxide cathodes used in high power...
Li‐rich layered oxides (LLOs) are among the most promising cathode materials with high theoretical specific capacity (>250 mAh g−1). However, capacity decay and voltage hysteresis due tostructural degradation during cycling impede the commercial application of LLOs. Surface engineering and element doping are two methods widely applied tomitigate the structural degradation. Here, it is found that...
Nanotechnology‐based strategy has recently drawn extensive attention for the therapy of malignant tumors due to its distinct strengths in cancer diagnosis and treatment. However, the limited intratumoral permeability of nanoparticles is a major hurdle to achieving the desired effect of cancer treatment. Due to their superior cargo towing and reliable penetrating property, micro‐/nanomotors (MNMs)...
Generating sufficient power from waste heat is one of the most important things for thermoelectric (TE) techniques in numerous practical applications. The output power density of an organic thermoelectric generator (OTEG) is proportional to the power factors (PFs) and the electrical conductivities of organic materials. However, it is still challenging to have high PFs over 1 mW m−1 K−2 in free‐standing...
Potassium‐ion batteries (PIBs) have great potential in energy storage due to their high abundance and low cost of potassium resources. Tellurium (Te) is a promising PIB cathode due to its high volumetric capacity and good electronic conductivity. However, the electrochemical (de)potassiation mechanism of Te remains elusive due to the lack of an effective method of directly observing the dynamic reaction...
Nitrogen (N2) is an essential element for life, but kinetically stable N2 in the atmosphere needs to be reduced to biologically available forms as a nutrient for organisms. Abiotic nitrogen fixation is critical to the origin of life on the early Earth, which is due to lightning or mineral‐based reduction. Here, synchrotron X‐ray‐induced silver nitrate formation on a silver copper (AgCu) thin‐film...
In‐Sensor Compression and Computing
In article number 2201111, Hong Wang and co‐workers use indium–gallium–zinc oxide phototransistors to achieve in‐sensor compression and computing, simulating the powerful information processing capability of the biological vision system, which only needs a partial signal stimulation to perceive the entire signal.
The biological nervous system possesses a powerful information processing capability, and only needs a partial signal stimulation to perceive the entire signal. Likewise, the hardware implementation of an information processing system with similar capabilities is of great significance, for reducing the dimensions of data from sensors and improving the processing efficiency. Here, it is reported that...
As the aging population increases in many countries, electronic skin (e‐skin) for health monitoring has been attracting much attention. However, to realize the industrialization of e‐skin, two factors must be optimized. The first is to achieve high comfort, which can significantly improve the user experience. The second is to make the e‐skin intelligent, so it can detect and analyze physiological...
The practical deployment of promising NiFe‐based oxygen evolution reaction (OER) electrocatalysts is heavily limited due to the constrain in both stability and activity under industrial conditions. Herein, a 3D free‐standing NiFe(oxy)hydroxide‐based electrode with Schottky junction is constructed, in which NiFe(oxy)hydroxide (NiFe(OH)x) nanosheets are chemically assembled on the top of metal‐like...
Organic–inorganic hybrid perovskites have been considered as promising gain materials for lasing. Despite previous reports of lasing from nanocrystals, thin films and single crystals, the stability of perovskite lasers has been a challenge for its practical applications. Herein, a scalable strategy to prepare ultrastable perovskite@polymer hybrid fibers by employing a facile emulsion electrospinning...
The rational design of catalytically active sites in porous materials is essential in electrocatalysis. Herein, atomically dispersed Fe‐Nx sites supported by hierarchically porous carbon membranes are designed to electrocatalyze the hydrazine oxidation reaction (HzOR), one of the key techniques in electrochemical nitrogen transformation. The high intrinsic catalytic activity of the Fe‐Nx single‐atom...
In article number 2002203, Tian Sheng, Shu‐Hui Sun, Jiayin Yuan, and co‐workers propose and verify atomically dispersed pyrrole‐type Fe‐N4 sites supported on hierarchically porous carbon membranes as real active sites for the electrochemical hydrazine oxidation reaction (HzOR), which will open up the future exploration of the metal‐Nx catalysts for HzOR in fuel cells and beyond.
In article number 1906432, Dan‐Hong Wang, Xian‐He Bu, and co‐workers present a novel design strategy aiming to form heteropoly blues confined in defected Zr‐metal–organic framework (MOF), which can expose more unsaturated metal sites to promote the catalytic activity by adding thiourea. Moreover, 1‐butyl 3‐methyl imidazolium phosphomolybdate blues are also confined in Zr‐MOF to obtain higher oxidative...
The Keggin‐type polyoxometalates (POMs) are effective catalysts for oxidative desulfurization (ODS) and confining these POMs in metal–organic frameworks (MOFs) is a promising strategy to improve their performances. Herein, postsynthetic modification of POMs confined in MOFs by adding thiourea creates more unsaturated metal sites as defects, promoting ODS catalytic activity. Additional modification...
Two‐dimensional (2D) materials have attracted extensive research interest in academia due to their excellent electrochemical properties and broad application prospects. Among them, 2D transition metal carbides (Ti3C2Tx) show semiconductor characteristics and are studied widely. However, there are few academic reports on the use of 2D MXene materials as memristors. In this work, reported is a memristor...
Memristors with nonvolatile memory characteristics have been expected to open a new era for neuromorphic computing and digital logic. However, existing memristor devices based on oxygen vacancy or metal‐ion conductive filament mechanisms generally have large operating currents, which are difficult to meet low‐power consumption requirements. Therefore, it is very necessary to develop new materials...
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