Space‐Charge Control of Magnetism in Ferromagnetic Metals: Coupling Giant Magnitude and Robust Endurance (Adv. Mater. 8/2023)

Abstract

In article number 2207353, Chen Ge, Qiang Li, and co-workers propose a space-charge mechanism, through decoupling the transport of ions and electrons, to achieve magnetoelectric coupling in ferromagnetic-metal films. This method combines the advantages of both carrier doping and chemical reaction mechanisms, which allows for an efficient modulation with both large-magnitude and robust endurance.

Magnetic Measurements Applied to Energy Storage

“…Owing to the ultrahigh sensitivity to magnetization, magnetometry can accurately monitor the magnetic changes caused by electron transfer during electrochemical processes, and it is a powerful tool for investigating conversion or alloy‐type alkali metal ion batteries (AMIBs) and spin‐based devices. [ 15,117 ] Magnetometers can measure the magnetization and magnetic susceptibility varying with the temperature or magnetic field, and the corresponding magnetic moment, particle size, and other information of samples can be obtained through quantitative analysis. [ 118,119 ] In situ magnetometry facilitates real‐time measurement of magnetization change along with electrochemical process, which can be called M – t or χ – t measurements.…”

Preparation of tough and stiff ionogels via phase separation

“…13,14 Accordingly, efforts have been made to solve the above-mentioned problems. 14 For example, Yan and co-workers 15 successfully prepared PVA/halometallate ionogels through the solvent exchange method. Due to the presence of supramolecular interactions and crystalline domains, the ionogels exhibited remarkable mechanical properties, including a tensile strength of up to 63.1 MPa and fracture elongation of 5248%.…”

Constructing Ni3Se2‐Nanoisland‐Confined Pt1Mo1 Dual‐Atom Catalyst for Efficient Hydrogen Evolution in Basic Media

“…[35,36] However, for atomically dispersed catalysts, the increased free energy of the metal surface inevitably makes it easier to aggregate into larger clusters or nanoparticles during the reaction. [37,38] The aggregation of metal atoms reduces the number of active sites, [39,40] which leads to the decline of catalyst activity and stability, thus largely limiting the practical application of atomic-scale catalysts in electrocatalysis. Remarkably, the confinement strategy could effectively anchor the atoms to prevent their aggregation process, which is a valid way to improve the stability of catalysts.…”