13results about How to "Increased photocurrent density" patented technology

The invention belongs to the technical field of photoelectrochemistry, and particularly relates to a preparation method and application of a high-performance NiCoOOH / MoO3 / Mo: BVO photoelectrode film. Firstly, a BiOI nano array is prepared through an electro-deposition method, and then a BVO photoelectrode film is prepared through high-temperature calcination. And then dispensing the Mo source on the BVO photoanode, and carrying out secondary high-temperature calcination to prepare the MoO3 / Mo: BVO photoelectrode film. And finally, cobalt nitrate hexahydrate and nickel sulfate hexahydrate are dissolved in a sodium hydroxide solution to prepare a NiCoOOH electro-deposition solution, and a NiCoOOH / MoO3 / Mo: BVO photoelectrode film is prepared through CV electrochemical deposition. At the moment, the cocatalyst NiCoOOH improves the stability, and meanwhile, the separation and injection efficiency of photon-generated carriers of BVO is enhanced by adding the MoO3 layer and doping Mo, so that the photoelectric property of the BVO photoelectrode is remarkably improved, and the BVO photoelectrode can be applied to photoelectrochemical water decomposition.

The present invention discloses a carbon quantum dot electrolyte solution for a photoelectrochemical cathode reduction system, which is synthesized by a hydrothermal method using a cationic surfactant as a precursor, and the raw materials used are low-cost, simple and easy to obtain, and the synthesis method is simple. The synthesized carbon quantum dot aqueous solution can be directly used as an electrolyte solution in a photoelectrochemical cathode reduction system. Compared with traditional electrolyte solutions, the carbon quantum dot electrolyte solution of the present invention significantly promotes the photoelectrochemical activity of the photoelectrochemical cathode reduction system, and different precursors can be selected to synthesize different carbon quantum dot aqueous solutions, realizing multiple functions such as water decomposition to produce hydrogen, oxygen reduction to prepare hydrogen peroxide, and the system stability is relatively high.

The application discloses a kind of heterojunction photoelectric detectors and preparation method thereof.The detector includes: substrate;Semiconductor epitaxial structure, at least including channel layer being arranged on the substrate and being located on the barrier layer of channel layer;Wherein, the thickness and component of the barrier layer are configured so that no two-dimensional electron gas is generated at the heterojunction interface between the channel layer and the barrier layer;First electrode and second electrode, set in the semiconductor epitaxial structure and electrically connected with the two-dimensional electron gas, constitute the electrical input end and output end of the heterojunction photoelectric detector.By configuring the thickness and component of the barrier layer so that no two-dimensional electron gas is generated in the channel, the damage of etching process to the channel is avoided, and the ultraviolet detector with extremely low dark current, high photocurrent density and no need to rely on etching process to deplete the channel is realized.

The invention discloses a preparation method of Znamp; the invention discloses a preparation method of a V double-doped CuWO4 photoelectrocatalysis film. According to the method, Znamp is prepared by adopting a two-step hydrothermal method; the preparation method of the V double-doped CuWO4 film comprises the following steps: firstly, preparing a V-doped WO3 film by adopting a hydrothermal method, then taking the V-doped WO3 film as a substrate, converting the WO3 film into CuWO4 by adopting a second-step hydrothermal method, and doping Zn into CuWO4 to finally obtain Znamp; according to the V double-doped CuWO4 photoelectrocatalysis film, the visible light absorption and carrier separation efficiency of CuWO4 are improved, the photoelectrocatalysis performance is improved, the preparation method is simple and easy to operate, and the overall cost is low.

The invention discloses a laser-induced in-situ reduction metal bismuth nanocluster modified bismuth vanadate composite photoanode and a preparation method and application thereof.The method comprises the steps that firstly, BiOI nanoparticles are deposited on a conductive substrate through an electro-deposition method, and a BiOI electrode is obtained; secondly, vanadium is introduced through a high-temperature roasting method to generate a bismuth vanadate nano-structure photo-anode; finally, metal bismuth nanoclusters are separated out on bismuth vanadate in situ through a laser-induced in-situ synthesis method, and the bismuth nanocluster modified bismuth vanadate (Bi / BiVO4) composite photo-anode is prepared. According to the preparation method, the metal bismuth nanoclusters with uniform particle sizes can be prepared and are tightly attached to the surface of the bismuth vanadate photoelectrode, effective separation of electron-hole pairs is induced due to existence of the bismuth nanoclusters, compounding of bulk phase charge carriers is inhibited, and the photoelectric water decomposition performance of BiVO4 is remarkably improved; the method is simple in synthesis process and good in repeatability, the used materials do not use any precious metal, the cost is greatly reduced, and the method has important guiding significance for large-scale commercial application in the future.

The invention discloses a method for strengthening degradation and conversion of lignocellulose through photo-Fenton treatment, which comprises the following steps: (1) mixing crushed straws with a hydrogen peroxide solution, activated carbon doped nickel ferrite nanoparticles and deionized water to obtain a mixed solution; (2) carrying out white light irradiation on the mixed solution while carrying out oscillation treatment, and then carrying out solid-liquid separation to obtain supernate and residues; and (3) performing enzymolysis saccharification on the residues. The straw is pretreated by adopting a photocatalysis and Fenton reaction synergistic mode, so that the effects of degrading and removing lignin, well retaining cellulose and efficiently performing enzymolysis saccharification are achieved.

This invention discloses an antibacterial and wound-healing photosensitizer, its preparation method, and its applications. The photosensitizer of this invention has a core-shell structure, with the core being MIL-88B modified with amino / bromodiphenyl ligands embedded in silver nanoparticles, and the shell being MIL-88C grown in situ on the core surface. The photosensitizer of this invention significantly improves the photogenerated carrier separation efficiency and reactive oxygen species generation capacity through its MOF-on-MOF heterostructure. Under light irradiation, it exhibits highly efficient killing effects against Staphylococcus aureus, Escherichia coli, and methicillin-resistant Staphylococcus aureus, while also possessing good biocompatibility, promoting fibroblast migration, and showing significant hemostatic and wound-healing effects. This photosensitizer has broad application prospects in the preparation of photodynamic antibacterial drugs and wound-healing medical materials.

The invention discloses a preparation method of a doped carbon quantum dot modified photoelectrocatalysis photo-anode. The preparation method comprises the following steps: a, heating a citric acid aqueous solution in a high-pressure hydrothermal reaction kettle, cooling, dialyzing, and freeze-drying to obtain carbon quantum dot powder; and b, dissolving the carbon quantum dot powder prepared in the step a into deionized water to obtain a solution, adding bismuth vanadate into the solution for soaking, washing and drying to obtain the doped carbon quantum dot modified photoelectrocatalytic photo-anode. The prepared photo-anode material not only can accelerate transfer and separation of charges, but also can effectively inhibit recombination of holes, so that the material shows relatively high photocurrent density, meanwhile, the material has excellent electrochemical oxidation catalytic activity, the water oxidation reaction kinetics of a photo-anode is effectively improved, and the stability of an electrode material is improved.

This invention relates to the field of photoelectrochemical water splitting materials technology, and particularly to a surface-confined sulfur-doped metal oxide photoanode and its preparation method. The method includes growing a metal oxide nanostructure on an FTO substrate using a hydrothermal method to obtain a metal oxide photoanode; repeatedly performing drop-coating and ignition treatments on the surface of the metal oxide photoanode to obtain an ignition-treated metal oxide photoanode; the drop-coating and ignition treatments include drop-coating sulfur-containing organic matter to form a liquid wet film, and igniting the liquid wet film in an air environment; cleaning and drying the ignition-treated metal oxide photoanode to obtain a surface-confined sulfur-doped metal oxide photoanode. This method utilizes the localized thermal field generated by liquid film combustion to drive sulfur atoms to diffuse to the surface and near-surface layer of the metal oxide, achieving precise surface-confined gradient doping.

The application of binaphthyl Salen cobalt molecular catalyst modified BiVO4 photoanode belongs to the field of photoelectrocatalysis technology and organic synthesis cross. BiOI film is deposited on FTO conductive glass by electrochemical deposition method, and then is converted into BiVO4 photoanode substrate by calcination; 3-hydroxy substituted binaphthyl Salen cobalt molecular catalyst CoL is synthesized; CoL is loaded on the surface of BiVO4 by cyclic voltammetry electrodeposition to obtain a hybrid photoanode. The photoanode is applied to the photoelectrocatalytic olefin epoxidation reaction, water is used as oxygen source, and acetone-water is used as electrolyte. The strong interface coupling between the catalyst and BiVO4 is strengthened by the electrodeposition of the molecular catalyst strategy, and the interface charge transport efficiency, reaction conversion rate and selectivity are improved. The conversion rate of styrene reaches 99%, the selectivity of epoxide reaches more than 90%, and the stability is excellent. The application provides a new way for green and efficient synthesis of epoxide, and has wide application prospect.

The invention discloses a photo-anode based on acid etching surface reconstruction and a preparation method thereof, and relates to the technical field of photoelectrochemistry. The preparation method comprises the following steps: S1, preparing a prismatic transition metal sulfide nanorod array on a cleaned conductive substrate to obtain a conductive substrate loaded with the prismatic transition metal sulfide nanorod array; and S2, acid etching is carried out on the conductive substrate loaded with the prismatic transition metal sulfide nanorod array in the step S1, the prismatic transition metal sulfide nanorod array is reconstructed into a cylindrical transition metal sulfide nanorod array, and the photo-anode based on acid etching surface reconstruction is obtained. After the prepared photoanode is subjected to acid etching surface reconstruction, the surface catalytic performance is obviously improved, the photocurrent density of an optimized sample under the bias voltage of 1.23 VRHE can reach 2.57 mA / cm < 2 > and is 2.89 times that of an original sample, and the photoanode has high photoelectrochemical performance.

This invention discloses a CeO-based x A method for suppressing charge recombination at the semiconductor / electrocatalyst interface using a control unit, for the first time employing electrodeposition and calcination processes to control Ce-rich... 3+ / Ce 4+ CeO in chemical valence state x Hole transfer units are introduced into semiconductors such as bismuth vanadate (BV), reduced bismuth vanadate (R-BV), and bismuth tungstate (BW), as well as FeNiOOH and FeNi(OH). x BV / CeO was constructed at the isoelectric catalyst interface. x / FeNiOOH、R-BV / CeO x / FeNi(OH) x and BW / CeO x / FeNi(OH) x This integrated system was then applied to the field of photoelectrochemical water splitting. Under the same conditions, the photocurrent density of the integrated system was significantly higher than that of the individual semiconductor / electrocatalyst systems, and also significantly higher than that of BV / Fe(OH), which also serves as a hole transfer unit. x The BV / FeNiOOH and BV / FeOOH / FeNiOOH composite materials achieve effective charge separation, providing insights for the design of efficient photoelectrochemical water splitting systems.