9 results about "Bismuth nanoparticles" patented technology

The application provides a preparation method of bismuth nanoparticle material and application thereof, and dissolves bismuth nitrate pentahydrate in ethylene glycol to prepare a solution, then adds nitric acid to accurately adjust the pH value of the solution to 1.0; dissolves sodium citrate in ethylene glycol to prepare a solution; mixes the two solutions and uniformly mixes; transfers the mixed solution to a microwave reaction kettle, and under the condition that the temperature is 110-130 DEG C and the microwave power is 300-500 W, radiates and reacts for 20-40 min; cools to room temperature, and the obtained product is washed by centrifugation with ethanol for multiple times, and dried, to obtain black bismuth nanoparticles. The application accurately controls the acidic environment of the precursor solution by nitric acid, and utilizes the synergistic and co-reduction effect of sodium citrate and ethylene glycol to quickly and controllably reduce Bi 3+ to elemental Bi to form nanoparticles. The application has outstanding advantages in efficiency, controllability, environmental protection and cost.

This invention discloses a dodecahedral Co-C / LDH composite electrode material loaded with bismuth nanoparticles, its preparation method, and its application. The composite material has a dodecahedron formed by a Co-C amorphous carbon layer as the core, an outer NiCoAl-LDH layer, and a surface loaded with Bi nanoparticles, forming a unique three-dimensional core-shell structure. Co-C / NiCoAl-LDH@Bi is assembled as the anode and AC as the cathode. The Co-C / NiCoAl-LDH@Bi / / AC device improves the Cl... ‑ Storage capacity, electrochemical reaction kinetics, and long-term cycling stability expand the application boundaries of LDH materials in the field of high-performance CDI anodes, providing high-performance material support for the practical application of CDI technology in seawater desalination. It is expected to promote the development and implementation of low-cost, large-scale seawater desalination systems and has important industrial application prospects and environmental value.

This invention relates to a method for preparing carbon nanoflower-coated bismuth electrode materials for fast-charging batteries, belonging to the field of new energy electrode material preparation technology. The invention involves adding bismuth oxide and chitin-like substances to deionized water and ultrasonically dispersing them to obtain a mixed solution. The mixed solution is then sealed in a reaction vessel and subjected to a high-temperature, high-pressure reaction, followed by solid-liquid separation to obtain the reaction product. The reaction product is calcined under a protective or reducing atmosphere to obtain the carbon nanoflower-coated bismuth electrode material. This carbon nanoflower-coated bismuth electrode material is a core-shell material, with a bismuth core and an outer shell of N-doped carbon nanoflowers, on which bismuth nanoparticles are loaded. The nanoflower coating layer of this invention exhibits high electrolyte permeability and wettability, buffering the volumetric expansion of the internal bismuth electrode during charging and discharging. The bismuth nanoparticles loaded on the carbon nanoflowers effectively improve the electrode's diffusion kinetics. The carbon nanoflower-coated bismuth electrode material possesses a large volumetric capacity and excellent fast-charging performance.

The invention discloses a bismuth titanate biomass charcoal composite material for environmental remediation and a preparation method thereof, and relates to the field of environmental functional materials.The composite material takes corncob biomass charcoal as a carrier, and bismuth titanate nanoparticles are loaded on the surface and in pores of the corncob biomass charcoal; the corncob biomass charcoal has a hierarchical porous structure, the specific surface area of the corncob biomass charcoal is not less than 1500 m / g, and the surface of the corncob biomass charcoal is rich in oxygen-containing functional groups; the bismuth titanate nanoparticles and the corncob biomass charcoal are tightly combined through a heterojunction interface; according to the bismuth titanate biomass charcoal composite material for environmental restoration and the preparation method of the bismuth titanate biomass charcoal composite material, firstly, pollutants are rapidly adsorbed and enriched to the periphery of bismuth titanate active sites through the high specific surface area and abundant pore structure of the corncob charcoal, local high concentration is formed, and favorable conditions are created for subsequent photocatalytic reaction; bismuth titanate generates strong oxidizing active oxygen species under excitation of visible light, and adsorbed pollutants are thoroughly degraded.

The invention relates to the field of gas diffusion electrodes, and discloses a multilayer gas diffusion electrode and a preparation method and application thereof, the electrode comprises a gas diffusion layer, a hydrophobic layer, a conductive layer, a catalyst layer and a porous protective layer, a catalyst in the catalyst layer comprises nitrogen-doped bismuth nanoparticles and a structural unit which is used for carrying out graft modification on the nitrogen-doped bismuth nanoparticles and is shown in a formula (1), R1 and R2 are hydrogen or alkyl respectively, and the sum of carbon numbers of R1 and R2 is smaller than 4. The gas diffusion electrode disclosed by the invention is excellent in performance and outstanding in stability in carbon dioxide electrolysis.

The invention provides a catalyst for preparing formic acid by electrolyzing carbon dioxide and a preparation method thereof, the catalyst comprises nitrogen-doped bismuth nanoparticles and a structural unit as shown in a formula (1) for graft modification of the nitrogen-doped bismuth nanoparticles, R1 and R2 are hydrogen or alkyl respectively, and the sum of carbon numbers of R1 and R2 is less than 4. The invention provides an electrocatalytic reduction method of carbon dioxide, which comprises the following steps: in the presence of the catalyst, taking gaseous carbon dioxide or carbon dioxide dissolved in a solvent as a reactant, and converting the carbon dioxide into formic acid or formate under an electrifying condition. The catalyst disclosed by the invention is excellent in performance in carbon dioxide electrolysis and has relatively high activity and formic acid selectivity.

This invention relates to a method for preparing a uniformly distributed bismuth nanoparticle / carbon nanorod composite material (Bi / CNRs) and its application as a negative electrode material for low-temperature fast-charging sodium-ion batteries. The preparation steps of this composite material are as follows: a) preparing bismuth iodide nanosheets (BiOI NSs); b) dispersing BiOI NSs and trimesic acid in a mixed solution of N,N-dimethylformamide and methanol, followed by hydrothermal reaction to obtain metal-organic framework materials (Bi-MOFs); c) thermally shocking the Bi-MOFs in an Ar atmosphere to obtain the Bi / CNRs composite material. As a negative electrode material for sodium-ion batteries, Bi / CNRs exhibits outstanding low-temperature electrochemical performance, reaching -40℃ and 5Ag. ‑1 The capacity at current density is 261 mAh g. ‑1 ;1A g ‑1 The capacity after 2400 cycles is 240mAh g. ‑1 This invention provides a new approach for developing low-temperature sodium-ion battery anode materials with excellent overall performance.

The application prepares an E.coli-BSO biological composite system for biological hydrogen production. The biological composite system breaks through the limitation of traditional single microorganism and material hydrogen production system, combines bismuth stannate (BSO) nanoparticles and E.coli through electrostatic interaction, and constructs a new composite system with the hydrogen production ability of microbial metabolism and the photocatalytic performance of nanomaterials. The system integrates the inherent hydrogen production metabolic pathway in E.coli cells and the excellent visible light absorption ability and photocatalytic electron transfer performance of BSO nanomaterials, solves the problems of low light energy utilization rate of pure microorganisms and hydrogen production of pure photocatalytic materials depending on external electron donors. Experimental verification shows that under visible light irradiation, the hydrogen production of the composite system reaches 0.8 mmol within 4 hours, which is 1.5 times higher than that of pure E.coli, and significantly breaks through the efficiency bottleneck of existing biological hydrogen production technology.

The invention relates to the technical field of sodium-ion battery preparation, in particular to a preparation method of a hard carbon composite material containing bismuth nanoparticles and application of the hard carbon composite material in a sodium-ion battery, and the preparation method comprises the following steps: S1, slowly dripping a formaldehyde solution into a resorcinol solution, mixing, then carrying out pre-reaction, then adjusting the pH value of the reaction solution to 8.5-9.0, adding a bismuth precursor, stirring, and carrying out solid-liquid separation to obtain a bismuth nanoparticle-containing hard carbon composite material; then adding a reducing agent, and reacting to obtain a phenolic resin composite bismuth nanoparticle precursor; and S2, calcining the phenolic resin composite bismuth nanoparticle precursor in a nitrogen atmosphere to obtain the hard carbon composite material containing bismuth nanoparticles. According to the composite material system prepared by the technical scheme, the electron and ion transmission performance of a negative electrode can be improved, the problem of sodium separation of hard carbon under a fast charging condition is relieved, the negative electrode is promoted to form a more stable SEI interface, and the rate capability and the cycle stability of a battery are improved.