11 results about "Cadmium salt" patented technology

The invention discloses a titanium dioxide nanorod / dissimilar metal MOFs heterojunction material and a preparation method and application thereof, and belongs to the technical field of photoelectrochemistry seawater hydrogen production. Soluble nickel salt, soluble cadmium salt or soluble cobalt salt and ammonium molybdate are adopted as metal sources, spherical dissimilar metal MOFs grow on the surface of a TiO2 nanorod in situ, and the TiO2 nanorod / dissimilar metal MOFs heterojunction material is prepared. According to the present invention, the oxygen deficiency-regulated dissimilar metal MOFs material (i.e., the titanium dioxide nanorod / dissimilar metal MOFs heterojunction material) is obtained through subsequent acid etching and annealing treatment, the material is subjected to in-situ reconstruction during the OER process to spontaneously form the active hydroxide (NiOOH) of anion protection (MoO4 < 2->), and the excellent stability is represented; only small Faraday efficiency loss (1.2-2.3%) occurs in a high chloride ion environment (3.5 wt%-7wt% of NaCl), and an extensible path is provided for industrial-scale solar hydrogen production by using seawater.

This invention relates to the field of materials preparation technology, specifically disclosing a method for preparing tungsten-molybdenum alloy powder based on a coprecipitation precursor. The method involves mixing sodium tungstate, sodium molybdate, and water to prepare a tungsten-molybdenum mixed solution; mixing the tungsten-molybdenum mixed solution with a precipitant solution containing zinc or cadmium salts, and allowing the tungsten and molybdenum to coprecipitate under stirring; filtering and washing the reaction slurry to obtain a wet precipitate of tungsten-molybdate coprecipitate, with the filtrate serving as the mother liquor; drying and grinding the wet precipitate of tungsten-molybdate coprecipitate to obtain tungsten-molybdate coprecipitate powder; and reducing the tungsten-molybdate coprecipitate powder in a hydrogen stream at 700-1000°C to obtain tungsten-molybdenum alloy powder and zinc or cadmium vapor. This invention combines the reduction and alloying reactions into one, with a reaction temperature below 1000°C, shortening the tungsten-molybdenum alloy powder preparation process and significantly saving energy and reducing consumption.

The invention relates to the technical field of preparation of high-purity inorganic nano materials, and discloses a controllable preparation method of a high-purity cadmium telluride nanocrystal, which comprises the following steps: pre-dissolving a conjugated acid salt in a water-phase reaction system, and reacting a cadmium salt precursor with a tellurium source precursor when ammonia gas is introduced as an inorganic gaseous ligand; a pH buffer system is constructed by ammonia gas and conjugated acid salt, and transient stability is provided for the generated cadmium telluride nanocrystals within the pH range for inhibiting the cadmium hydroxide impure phase; according to the method disclosed by the invention, an in-situ pH buffer system is constructed, so that a ligand stabilization function of the ammonia gas is decoupled from an alkaline side reaction phase of the ammonia gas, agglomeration is prevented while an impure phase is inhibited, the ligand and the salt are thoroughly removed after the reaction, and the technical problem that controllability and high purity cannot be obtained at the same time in an inorganic aqueous phase method is solved.

The invention provides an aqueous cadmium ion-vanadium dioxide battery as well as a preparation method and application thereof, and relates to the field of ocean energy storage. The battery comprises a negative electrode, a positive electrode, a diaphragm and an aqueous electrolyte, the negative electrode is metal cadmium or cadmium-based alloy; the active material of the positive electrode is metastable monoclinic phase vanadium dioxide; the diaphragm is a glass fiber diaphragm; the aqueous electrolyte is an aqueous solution containing cadmium salt; the total concentration of the cadmium salt in the aqueous electrolyte is 1-4 mol / L. The aqueous vanadium dioxide-cadmium metal secondary battery disclosed by the invention has the advantages of safe aqueous electrolyte system, high rate capability, ultra-long cycle life and the like, and has remarkable advantages when being applied to ocean energy storage.

The application belongs to the technical field of photoelectric materials, and particularly relates to a yttrium-doped CdS thin film and a preparation method and application thereof. The preparation method of the yttrium-doped CdS thin film comprises the following steps: adding a cadmium salt solution, ammonia water and a thiourea solution into water in sequence and stirring uniformly to obtain a mixed solution; immersing a conductive substrate on which a P-type chalcogenide compound absorption layer thin film is formed into the mixed solution, and performing initial deposition through water bath heating; taking out the conductive substrate after the initial deposition, immersing it into a yttrium salt solution first, and then depositing it in the mixed solution, repeating the immersing and depositing operations for 4-6 times, and washing and drying to obtain the yttrium-doped CdS thin film. The yttrium-doped CdS thin film prepared by the application is used as a buffer layer for a CZTSSe solar cell, and a photoelectric conversion efficiency of 15.19% is achieved.

The application discloses a preparation method and application of a cadmium-based fluorescent probe material. The probe compound is obtained by using inorganic cadmium salt and o-phenanthroline as reactants through water bath reaction, and has a chemical formula of [Cd(phen)2(NO3)2], and cell parameters of alpha=90.00°, beta=105.939(1)° and gamma=90.00°. The probe compound has high fluorescence emission efficiency and fluorescence stability, can produce fluorescence quenching effect on Fe 3+ , Co 2+ and Cr2O7 2‑ of different concentration ranges, and can produce fluorescence enhancement effect on SCN ‑ , Br ‑ and I ‑ of different concentration ranges. The probe compound has simple synthesis process, cheap and easily obtained raw materials, good stability, high yield and high purity, can produce specific response to Fe 3+ , Co 2+ , Cr2O7 2‑ , SCN ‑ , Br ‑ and I ‑ at the same time, and has good application prospect.

The application provides a water-based cadmium ion-vanadium dioxide battery and a preparation method and application thereof, and relates to the field of marine energy storage.The application comprises a negative electrode, a positive electrode, a diaphragm and a water-based electrolyte; the negative electrode is metal cadmium or a cadmium-based alloy; the active substance of the positive electrode is metastable monoclinic phase vanadium dioxide; the diaphragm is a glass fiber diaphragm; the water-based electrolyte is an aqueous solution containing cadmium salt; and the total concentration of the cadmium salt in the water-based electrolyte is 1-4 mol / L.The water-based vanadium dioxide-cadmium metal secondary battery has the advantages of a safe water-based electrolyte system, high rate performance and super-long cycle life, and has significant advantages in marine energy storage.

The present application belongs to the technical field of catalysts, and particularly relates to a cadmium-bismuth alloy as well as a preparation method and application thereof. The present application provides a cadmium-bismuth alloy, which comprises cadmium and bismuth, and the molar percentage of the cadmium in the cadmium-bismuth alloy is 1-10%. The cadmium-bismuth alloy can greatly improve the selectivity of formate as a catalyst for electrocatalytic reduction of carbon dioxide to formate. The present application also provides a preparation method of the cadmium-bismuth alloy, which comprises the following steps: uniformly dispersing a bismuth salt in a first solvent to obtain a bismuth salt dispersion; dissolving a cadmium salt in a second solvent to obtain a cadmium salt solution; adding the bismuth salt dispersion and the cadmium salt solution into a reducing agent solution dropwise after mixing, and performing a reduction reaction to obtain the cadmium-bismuth alloy. The preparation method provided by the present application is simple and easy to operate, and can be used for industrial production.

The application relates to the technical field of high-purity inorganic nanomaterial preparation, and discloses a controllable preparation method of high-purity cadmium telluride nanocrystals, which comprises the following steps: pre-dissolving a conjugate acid salt in an aqueous phase reaction system, introducing ammonia as an inorganic gaseous ligand, and making a cadmium salt precursor and a tellurium source precursor react; the ammonia and the conjugate acid salt construct a pH buffer system, transiently stabilize the generated cadmium telluride nanocrystals in a pH range for inhibiting cadmium hydroxide impurities; and the ammonia and the conjugate acid salt are physically removed after the reaction. The application decouples the ligand stability function of the ammonia from the alkaline side reaction of the ammonia by constructing an in-situ pH buffer system, prevents agglomeration while inhibiting impurities, and completely removes the ligand and the salt after the reaction, so that the technical problem that controllability and high purity cannot be achieved simultaneously in the inorganic aqueous phase method is solved.

The invention provides a sensing material based on a cadmium metal organic framework as well as a preparation method and application of the sensing material, and a chemical structural unit of the sensing material comprises cadmium ions and 2, 3-quinoline diformate anions; the preparation method at least comprises the following steps: adding 2, 3-quinolinedicarboxylic acid and cadmium salt into a mixed solvent, carrying out solvothermal reaction at 130-150 DEG C for 36-60 hours, and after the reaction is finished, cooling and separating to obtain the Cd-MOF sensing material. The Cd-MOF sensing material disclosed by the invention is good in stability and has high selectivity and high sensitivity to Fe < 3 + > ions, and the good stability and wide pH adaptability of the sensing material guarantee the reliable detection capability in different actual water samples; the bottleneck problem that sensitivity, selectivity, environmental applicability and on-site convenience of a traditional sensing technology are difficult to consider at the same time is systematically solved.

The application relates to a cadmium-bromine-manganese single liquid flow, wherein the positive electrolyte and the negative electrolyte are both 1-5M (preferably 1-4M, more preferably 2-3M) H2SO4 aqueous solution; the molar concentration of bromine ions in the electrolyte is 0.25-4mol / L; the molar concentration of cadmium ions in the electrolyte is 0.1-4mol / L; the molar concentration of divalent manganese ions in the electrolyte is 0.1-4mol / L; and the molar ratio of bromine ions to divalent manganese ions in the electrolyte is 0.25-4. The electrolyte is a mixed aqueous solution of cadmium salt, manganese salt and bromide, the cost is low, the solubility of the bromide and the manganese salt is very high, the energy density of the battery is high, the electrochemical activity of the electrolyte is better, the current density of the battery operation is very high, and the power density of the battery is high.