Organosilicon chemistry, polymer derived ceramic materials, and methods. Such materials and methods for making polysilocarb (SiOC) and Silicon Carbide (SiC) materials having 3-nines, 4-nines, 6-nines and greater purity. Processes and articles utilizing such high purity SiOC and SiC.

Organosilicon chemistry, polymer derived ceramic materials, and methods. Such materials and methods for making polysilocarb (SiOC) and Silicon Carbide (SiC) materials having 3-nines, 4-nines, 6-nines and greater purity. Processes and articles utilizing such high purity SiOC and SiC.

A negative electrode material, and a negative electrode plate, an electrochemical device, and an electronic device including the same. The negative electrode material includes SiM.sub.xC.sub.y, where 0.5≤x≤2, 0.5≤y≤4, and M includes at least one of boron, nitrogen, oxygen, or aluminum; for SiM.sub.xC.sub.y, a particle size at a quantity accumulation degree of A % is D.sub.NA, a particle size at a volume accumulation degree of B % is D.sub.VB, and a half-peak width of a quantity distribution curve is ΔD.sub.N; and 2 μm≤(D.sub.V50−D.sub.N50)≤6 μm, and 1≤(D.sub.N99−D.sub.N1)/ΔD.sub.N≤1.3. The use of the negative electrode material, and the negative electrode plate, the electrochemical device and the electronic device including the same according to the present application achieve good cycle performance and energy density.

A negative electrode material, and a negative electrode plate, an electrochemical device, and an electronic device including the same. The negative electrode material includes SiM.sub.xC.sub.y, where 0.5≤x≤2, 0.5≤y≤4, and M includes at least one of boron, nitrogen, oxygen, or aluminum; for SiM.sub.xC.sub.y, a particle size at a quantity accumulation degree of A % is D.sub.NA, a particle size at a volume accumulation degree of B % is D.sub.VB, and a half-peak width of a quantity distribution curve is ΔD.sub.N; and 2 μm≤(D.sub.V50−D.sub.N50)≤6 μm, and 1≤(D.sub.N99−D.sub.N1)/ΔD.sub.N≤1.3. The use of the negative electrode material, and the negative electrode plate, the electrochemical device and the electronic device including the same according to the present application achieve good cycle performance and energy density.

Provided are MXene-containing electrodes, display devices, electrochromic devices, and other optoelectronic devices, which devices can include transparent and/or colored MXene materials. In particular, MXenes can be used as transparent conducting electrodes based on their comparatively high electrical conductivity and high work function. An electrode, comprising: a substrate; a portion of MXene material disposed on the substrate; a hole-injection material disposed on the MXene material; an organic layer in electronic communication with the hole-injection material; and a conductor material in electronic communication with the hole-injection material.

Provided are MXene-containing electrodes, display devices, electrochromic devices, and other optoelectronic devices, which devices can include transparent and/or colored MXene materials. In particular, MXenes can be used as transparent conducting electrodes based on their comparatively high electrical conductivity and high work function. An electrode, comprising: a substrate; a portion of MXene material disposed on the substrate; a hole-injection material disposed on the MXene material; an organic layer in electronic communication with the hole-injection material; and a conductor material in electronic communication with the hole-injection material.

The present disclosure provides a rigid self-supporting MXene separation membrane and a preparation method and use thereof, belonging to the technical field of membranes. In the present disclosure, a MXene material is mixed with an aluminum salt powder to conduct one-step membrane formation by hot-pressing. The pressure forms the powder into a membrane and imparts rigidity, enabling a self-supporting structure; the heating breaks an ionic bond of an inorganic metal salt to reach a molten ionic state, and free metal cations react with active oxygen-containing functional groups on the surface of the MXene to form new chemical bonds (such as an Al—O bond); such a chemical bond has higher energy, achieving a desirable anti-swelling effect to improve the membrane stability. The separation membrane further has excellent conductivity and hydrophilicity.

The present disclosure provides a rigid self-supporting MXene separation membrane and a preparation method and use thereof, belonging to the technical field of membranes. In the present disclosure, a MXene material is mixed with an aluminum salt powder to conduct one-step membrane formation by hot-pressing. The pressure forms the powder into a membrane and imparts rigidity, enabling a self-supporting structure; the heating breaks an ionic bond of an inorganic metal salt to reach a molten ionic state, and free metal cations react with active oxygen-containing functional groups on the surface of the MXene to form new chemical bonds (such as an Al—O bond); such a chemical bond has higher energy, achieving a desirable anti-swelling effect to improve the membrane stability. The separation membrane further has excellent conductivity and hydrophilicity.

A composite comprising a MXene and a post-transition metal wherein the post-transition metal is at least partially encapsulated by from 1 to 4 layers of the MXene. Methods of making such a composite are also disclosed.

The present invention relates to a method for preparation of a powder comprising at least one carbide of at least one metal, comprising the steps consisting of: (a) preparing a solution comprising at least one organic gelling agent and at least one inorganic salt of at least one metal in a solvent; (b) modifying the pH of the solution prepared in step (a) in such a way as to precipitate said at least one metal and to obtain a colloidal suspension comprising nanoparticles of oxyhydroxides of said at least one metal; (c) removing the solvent from the colloidal suspension obtained in step (b) by which means a precursor of at least one carbide of at least one metal is obtained; and (d) subjecting the precursor obtained in step (c) to a thermal treatment in order to transform same into a powder comprising at least one carbide of at least one metal. The present invention also relates to the powder thus prepared and the various uses thereof.