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Switchable spontaneous polarization is the vital property of ferroelectrics, which leads to other key physical properties such as piezoelectricity, pyroelectricity, and nonlinear optical effects, etc. Recently, organic–inorganic hybrid perovskites with 2D layered structure have become an emerging branch of ferroelectric materials. However, most of the 2D hybrid ferroelectrics own relatively low polarizations...
As a remarkable structure, 2D magnetic heterojunctions have attracted researchers’ attention owing to their controlled manipulation in the electronic device. However, successful fabrication as well as modulation of their structure and compound remain challenging. Herein, a novel method is designed to obtain a CoCl2/Co3O4 heterojunction on Si/SiO2 substrate with the assistance of supercritical CO2...
Hydrogen is emerging as an alternative clean fuel; however, its dependency on freshwater will be a threat to a sustainable environment. Seawater, an unlimited source, can be an alternative, but its salt‐rich nature causes corrosion and introduces several competing reactions, hindering its use. To overcome these, a unique catalyst composed of porous sheets of nitrogen‐doped NiMo3P (N‐NiMo3P) having...
Metallic Bi, as an alloying‐type anode material, has demonstrated tremendous potential for practical application of potassium‐ion batteries. However, the giant volume expansion, severe structure pulverization, and sluggish dynamics of Bi‐based materials result in unsatisfied rate performance and unstable cycling stability. Here, 2D bismuth@N‐doped carbon sheets with BiOC bond and internal void space...
Potassium‐Ion Storage
In article number 2203976, Songping Wu, Zhiguang Xu, Yurong Yan, and co‐workers successfully fabricate 2D bismuth@N‐doped carbon sheets with a powerful BiOC bond and internal void space for achieving ultrahigh rate and stable potassium‐ion storage. The influence of interface microstructure and chemical coupling on the electrochemical properties are revealed by ex/in‐situ techniques...
As the lightest solid element and also the simplest metal, lithium (Li) is one of the best representations of quasi‐free electron model in both bulk form and the reduced dimensions. Herein, the controlled growth of 2D ultrathin Li nanosheets is demonstrated by utilizing an in situ electrochemical platform built inside transmission electron microscope (TEM). The as‐grown freestanding 2D Li nanosheets...
Pd‐ and Pd‐based catalysts have emerged as potential alternatives to Pt‐ and Pt‐based catalysts for numerous electrocatalytic reactions, particularly fuel cell‐related reactions, including the anodic fuel oxidation reaction (FOR) and cathodic oxygen reduction reaction (ORR). The creation of Pd‐ and Pd‐based architectures with large surface areas, numerous low‐coordinated atoms, and high density of...
Lithium‐ion batteries (LIBs) have been widely applied and studied as an effective energy supplement for a variety of electronic devices. Titanium dioxide (TiO2), with a high theoretical capacity (335 mAh g−1) and low volume expansion ratio upon lithiation, has been considered as one of the most promising anode materials for LIBs. However, the application of TiO2 is hindered by its low electrical conductivity...
Constructing unique mesoporous 2D Si nanostructures to shorten the lithium‐ion diffusion pathway, facilitate interfacial charge transfer, and enlarge the electrode–electrolyte interface offers exciting opportunities in future high‐performance lithium‐ion batteries. However, simultaneous realization of 2D and mesoporous structures for Si material is quite difficult due to its non‐van der Waals structure...
In article number 1703361, Zhuo Chen, Chuanbao Cao, Min Xia, and co‐workers report that 2D ultrathin mesoporous silicon (Si) nanosheets with a homogeneous carbon layer achieve remarkably enhanced lithium‐storage properties, cycle stability and rate capability, which can be attributed to the coexistence of both the homogeneous carbon layer, and 2D mesoporous nanostructures in the Si materials to shorten...
Recently, organic–inorganic hybrid perovskites (OIHP) are studied in memory devices, but ternary resistive memory with three states based on OIHP is not achieved yet. In this work, ternary resistive memory based on hybrid perovskite is achieved with a high device yield (75%), much higher than most organic ternary resistive memories. The pseudohalide‐induced 2D (CH3NH3)2PbI2(SCN)2 perovskite thin film...
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