Disclosed by the present disclosure are Group II-III-V-VI quantum dot, preparation method therefor and quantum dot optoelectronic device. The method for preparing Group II-III-V-VI quantum dots includes the following steps: S1, providing a first solution containing a Group III-V quantum dot cores, or providing a second solution containing a Group II-III-V quantum dot cores; S2, adding a second supplementary liquid to the first solution, or adding a first supplementary liquid to the second solution, and reacting to obtain a Group II-III-V-VI quantum dot cores; wherein, reacting a first mixture at a temperature of 40˜100° C., and then adding a precursor of a first Group VI element and reacting to obtain the first supplementary liquid; or reacting a second mixture at a temperature of 40˜100° C., and then adding a precursor of a first Group VI element and reacting to obtain the second supplementary liquid.

A novel metal oxide is provided. One embodiment of the present invention is a crystalline metal oxide. The metal oxide includes a first layer and a second layer; the first layer has a wider bandgap than the second layer; the first layer and the second layer form a crystal lattice; and in the case where a carrier is excited in the metal oxide, the carrier is transferred through the second layer. Furthermore, the first layer contains an element M (M is one or more selected from Al, Ga, Y, and Sn) and Zn, and the second layer contains In.

The inventive method provides for a method of p-type doping of Ga.sub.2O.sub.3 without adding impurity elements. Embodiments allow for significant simplification relative to extrinsic impurity element doping, and thus offers a reduced fabrication cost while being more temperature resistant since the defect dopants require higher temperatures to alter their impact. Certain methods disclosed provide for p-type gallium oxide formation via intrinsic defect doping, without requiring the addition of impurity elements which provide significant simplification relative to the existing state of the art approaches providing more temperature and radiation resistance, while offering a reduced fabrication cost.

A method for electrochemical extraction of uranium from seawater using an oxygen vacancy (OV)-containing metal oxide includes the following steps: adding glycerin to a solution of indium nitrate in isopropanol, transferring a resulting mixture to a reactor, and conducting reaction to obtain a spherical indium hydroxide solid; dissolving the solid in deionized water, transferring a resulting solution to the reactor, and conducting reaction to obtain a flaky indium hydroxide solid; calcining the solid to obtain calcined OV-containing In.sub.2O.sub.3-x; adding the In.sub.2O.sub.3-x to ethanol, and adding a membrane solution; coating a resulting solution uniformly on carbon paper, and naturally drying the carbon paper; clamping dried carbon paper with a gold electrode for being used as a working electrode for a three-electrode system; and adding simulated seawater to an electrolytic cell, placing the three-electrode system in the simulated seawater, and stirring the simulated seawater for electrolysis to extract uranium from the seawater.

A method for electrochemical extraction of uranium from seawater using an oxygen vacancy (OV)-containing metal oxide includes the following steps: adding glycerin to a solution of indium nitrate in isopropanol, transferring a resulting mixture to a reactor, and conducting reaction to obtain a spherical indium hydroxide solid; dissolving the solid in deionized water, transferring a resulting solution to the reactor, and conducting reaction to obtain a flaky indium hydroxide solid; calcining the solid to obtain calcined OV-containing In.sub.2O.sub.3-x; adding the In.sub.2O.sub.3-x to ethanol, and adding a membrane solution; coating a resulting solution uniformly on carbon paper, and naturally drying the carbon paper; clamping dried carbon paper with a gold electrode for being used as a working electrode for a three-electrode system; and adding simulated seawater to an electrolytic cell, placing the three-electrode system in the simulated seawater, and stirring the simulated seawater for electrolysis to extract uranium from the seawater.

Provided are a core shell particle including a core which contains a Group III element and a Group V element, and a shell which covers at least a part of a surface of the core and contains a Group II element and a Group VI element, in which the core shell particle has a tetrahedral shape having one side with a length of 6 nm or greater; a method of producing the core shell particle; and a film formed of the core shell particle.

Provided are a core shell particle including a core which contains a Group III element and a Group V element, and a shell which covers at least a part of a surface of the core and contains a Group II element and a Group VI element, in which the core shell particle has a tetrahedral shape having one side with a length of 6 nm or greater; a method of producing the core shell particle; and a film formed of the core shell particle.

A method comprising reacting an aluminum mineral polymorph or a gallium mineral polymorph with an acid at an aluminum metal to acid molar ratio or gallium metal to acid molar ratio sufficient to produce M.sub.13 nanoscale clusters, M nano-agglomerates, or a M.sub.13 slurry, wherein M is Al or Ga.

A method comprising reacting an aluminum mineral polymorph or a gallium mineral polymorph with an acid at an aluminum metal to acid molar ratio or gallium metal to acid molar ratio sufficient to produce M.sub.13 nanoscale clusters, M nano-agglomerates, or a M.sub.13 slurry, wherein M is Al or Ga.

A battery cell having an anode or cathode comprising an acidified metal oxide (“AMO”) material, preferably in monodisperse nanoparticulate form 20 nm or less in size, having a pH<7 when suspended in a 5 wt % aqueous solution and a Hammett function H.sub.0>−12, at least on its surface.