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Oxygen Evolution Reaction
In article number 2307069, Zhisheng Wu, Zhi Fang, Qing Shi, and co‐workers report a simple and fast strategy to promote self reconstruction of NiFe‐layered double hydroxides and form highly active NiFeOOH centers. The trace Zn dopants have been introduced in advance, followed by leaching over the electrochemical activation process. The self‐restructured NiFeOOH‐VZn exhibits...
Optimizing the active centers through reconstruction is recognized as the key to construct high‐performance oxygen evolution reaction (OER) catalysts. Herein, a simple and rapid in situ leaching strategy to promote the self‐reconstruction of NiFe‐layered double hydroxides (LDHs) catalysts is reported. The trace Zn dopants are introduced in advance by a facile and one‐step hydrothermal method, followed...
Waste Heat Harvesting
In article number 2304308, Weitao Jiang and co‐workers arranged thermal diode‐pairs with fractal structures and dual‐direction thermal regulation ability in opposite directions to construct artificial hot‐ or cold‐zones. Thermoelectric‐legs as battery units and stacked parallel on diodes exhibit enhanced power‐supply capability with unprecedented long‐duration (more than hours),...
Thermal energy harvesting provides an opportunity for multi‐node systems to achieve self‐power autonomy. Thermoelectric generators (TEGs), either by thermocouple arrangement with higher‐aspect‐ratios or thermoelectric films overlay, are limited by the small temperature difference and its short‐duration (less than dozens of minutes), hindering the harvesting efficiency. Here, by introducing thermal...
The nitrides and carbides of transition metals are highly favored due to their excellent physical and chemical properties, among which MXene is a hot research topic for microwave absorption. Herein, the controlled preparation of 3D Mo2TiC2Tx‐based microspheres toward microwave absorption is reported for the first time. With the merits of the performances of both reduced graphite oxide (RGO) and MXene...
Te‐based materials with excellent electrical conductivity and ultra‐high volume specific capacity have attracted much attention for the cost‐efficient aqueous Zn batteries. However, the construction of functional structures with mild volume expansion and suppressed shuttle effects, enabling an expanded lifespan, is still a challenge for conversion‐type materials. Herein, the carbon‐coated zinc telluride...
Aqueous Zn Batteries
In article number 2304916, Zichao Yan, Zhiqiang Zhu, and co‐workers present a carbon coating strategy that aims to overcome the volume variation and intermediates dissolution of the ZnTe cathode in aqueous zinc‐tellurium batteries. The rationally designed carbon coated ZnTe nanowires deliver a high specific capacity of 586 mAh g−1 at 0.1 A g−1 and maintain more than 250 mAh g−1...
Replacing high‐cost and scarce platinum (Pt) with transition metal and nitrogen co‐doped carbon (M/N/C, M = Fe, Co, Mn, and so on) catalysts for the oxygen reduction reaction (ORR) in proton exchange membrane fuel cells has largely been impeded by the unsatisfactory ORR activity of M/N/C due to the low site utilization and inferior intrinsic activity of the M─N4 active center. Here, these limits are...
Commercial polymer separators usually have limited porosity, poor electrolyte wettability, and poor thermal and mechanical stability, which can deteriorate the performance of battery, especially at high current densities. In this work, a functional polyethylene (PE) separator is prepared by surface engineering a layer of Ti‐doped SiO2@Al2O3 particles (denoted as ST@Al2O3‐PE) with strong Lewis acid...
Drought and water scarcity are two of the world's major problems. Solar‐powered sorption‐based atmospheric water harvesting technology is a promising solution in this category. The main challenge is to design materials with high water harvesting performance while achieving fast water vapor adsorption/desorption rates. Here, a superhydrophilic photothermic hollow nanocapsule (SPHN) is represented that...
Superhydrophilic Photothermic Nanocapsules
In article number 2303358, Yongmei Zheng and co‐workers design a superhydrophilic photothermic hollow nanocapsule (SPHN) by using hollow mesoporous silica (HMS) that is grafted with polypyrrole (PPy) and also loaded with LiCl. SPHN significantly improves the adsorption/desorption kinetics, and lowers the heat of desorption due to porous and nano‐channel structure...
Current research on hemostatic materials have focused on the inhibition of visible hemorrhage, however, invisible hemorrhage is the unavoidable internal bleeding that occurs after trauma or surgery, leading directly to a dramatic drop in hemoglobin and then to anemia and even death. In this study, bacterial nanocellulose (BNC) was synthesized and oxidized from the primary alcohols to carboxyl groups,...
Enzyme‐instructed self‐assembly of bioactive molecules into nanobundles inside cells is conceived to potentially disrupt plasma membrane and subcellular structure. Herein, an alkaline phosphatase (ALP)‐activatable hybrid of ICG‐CF4KYp is facilely synthesized by conjugating photosensitizer indocyanine green (ICG) with CF4KYp peptide via classical Michael addition reaction. ALP‐induced dephosphorylation...
Delicate electrochemical active surface area (ECSA) engineering over the exposed catalytic interface and surface topology of platinum‐based nanomaterial represents an effective pathway to boost its catalytic properties toward the clean energy conversion system. Here, for the first time, the facial and universal production of dendritic Pt‐based nanoalloys (Pt‐Ni, Co, Fe) with highly porous feature...
Efficient Oxygen Reduction
In article number 2205283, Lei Zhang, Xueliang Sun, Xiangzhong Ren, and co‐workers leverage single‐atom Fe‐N‐C as a model system and report an adjacent Ru‐N4 moiety modulation effect to optimize the catalyst's electronic configuration and oxygen reduction reaction (ORR) performance. The resultant FeN4/RuN4 catalyst shows excellent ORR performance with a halfwave potential...
Single‐atom catalysts based on metal–N4 moieties and embedded in a graphite matrix (defined as MNC) are promising for oxygen reduction reaction (ORR). However, the performance of MNC catalysts is still far from satisfactory due to their imperfect adsorption energy to oxygen species. Herein, single‐atom FeNC is leveraged as a model system and report an adjacent Ru‐N4 moiety modulation effect...
Photoresponsive phase change materials (PPCMs) are capable of storing photon and heat energy simultaneously and releasing the stored energy as heat in a controllable way. While, the azobenzene‐based PPCMs exhibit a contradiction between gravimetric energy storage density and photoinduced phase change. Here, a type of azobenzene surfactants with balance between molecular free volume and intermolecular...
Anti‐icing coatings on outdoor infrastructures and transportations inevitably suffer from surface injuries, especially in extreme weather events (e.g., freezing weather or acid rain). The coating surface damage can result in anti‐icing performance loss or even icing promotion. The development of anti‐icing coatings that enables self‐healing in extreme conditions is highly desired but still challenging...
The majority of commercial polyolefins are produced by coordination polymerization using early or late transition metal catalysts. Molecular catalysts containing these transition metals (Ti, Zr, Cr, Ni, and Fe, etc.) are loaded on supports for controlled polymerization behavior and polymer morphology in slurry or gas phase processes. Within the last few years, metal–organic frameworks (MOFs), a class...
DNA nanotubes with prescribed geometry could allow for nanomaterial organization with designed optical or electrical function. As one of the dominating driving forces for DNA nanotube assembly, intrinsic curvature and twist of building blocks can be induced by bending deformation and twisting deformation. However, it is still unknown that how bending and twisting design on nanoscale building blocks...
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