7 results about "Diffusion layer" patented technology

A fuel cell structure comprises a diffusion layer and/or a catalyst layer which are made of a carbonaceous porous material having a nano-size structure, such as carbon nanowall (CNW). A method of manufacturing the structure is also disclosed. The structure and method simplify the process of manufacturing a fuel cell electrode comprised of an electrode catalyst layer and a gas diffusion layer. The electrical conductivity of the catalyst layer is increased and the diffusion efficiency of the diffusion layer is improved, whereby the electricity generation efficiency of the fuel cell can be improved.

The invention belongs to the technical field of clinical in vitro diagnostic reagents and relates to a dry chemical reagent tablet for quantitatively measuring the concentration of total cholesterol and a preparation method of the dry chemical reagent tablet. The dry chemical reagent tablet comprises four laminations which are respectively a support layer, a color developing layer, a reagent layerand a diffusion layer distributed sequentially; and reagents in the reagent layer include a buffer system, a hydrophilic colloid, peroxidase, an activator, a surfactant and a stabilizer; and reagentsin the color developing layer include a chromogen and a hydrophilic colloid. Compared with the prior art, the dry chemical reagent tablet and the preparation method thereof of the invention have theadvantages of simple operation process, high stability, high good repeatability and high accuracy of detection results, quantitative detection, wide linear range, simple and convenient preparation process, easiness in operation, low risk and low pollution. According to the dry chemical reagent tablet and the preparation method of the dry chemical reagent tablet of the invention, the reagents do not need to be prepared, and samples can be directly added dropwise; the reagent tablet is dry and is free of moisture; the diffusion layer has a filtering function, so that hemolysis, bilirubin and ascorbic acid samples exert no significant interference on measurement results.

The invention discloses a composite cathode of a microbial fuel cell and a preparation method thereof. The composite cathode in turn comprises a catalytic layer, a carbon cloth layer, a carbon base layer and a diffusion layer from one side to the other side; and the material of the catalytic layer is a mixture of a graphene oxide / magnesium oxide composite material, activated carbon and perfluorinated sulfonic acid. The composite cathode of the microbial fuel cell is prepared from the magnesium oxide / graphene oxide composite material. Compared with noble metal platinum and alloy materials thereof, the raw materials of the composite cathode of the microbial fuel cell are wide in source and low in price, and the prepared composite cathode has a large surface area, excellent conductivity and stable electronic migration, can be used in microbial fuel cells, has low cost, stable operation and high output power, and can be widely used in the microbial fuel cells, lithium batteries or super capacitors.

The invention discloses an etching method for the diffusion layer of a crystalline silicon solar battery sheet. First, the silicon sheet that has been diffused and doped is put into a tubular thermal oxidation furnace, and a silicon sheet is deposited on the front side of the silicon sheet by a chemical vapor deposition method. layer of silicon dioxide film; place the silicon chip in the mixed solution of phosphoric acid and nitric acid to fully react the silicon chip with the solution, wherein the molar ratio of phosphoric acid to nitric acid is phosphoric acid: nitric acid = 2-5:10; Put the chip into hydrofluoric acid solution, remove the silicon dioxide film layer on the surface of the silicon chip, and then rinse it with deionized water. The etching method of the invention has the advantages of simple process, low equipment requirements, easy monitoring of the etching process, high production efficiency, and can effectively reduce the number of low-efficiency cells caused by etching.

An object of the present invention is to provide an optical waveguide element that effectively diffuses charges accumulated in a substrate, and suppress DC drift or temperature drift. The optical waveguide element includes a substrate having an electro-optical effect, optical waveguides formed in the substrate, a buffer layer (BF layer) formed on the substrate, and modulation electrodes (signal electrode and ground electrode) that are formed on the buffer layer and modulate optical waves propagating through the optical waveguides, a charge diffusion layer that diffuses charges generated in the substrate is formed between the substrate and the buffer layer, and the charge diffusion layer is electrically connected with a ground electrode constituting the modulation electrode.

There is provided a high-voltage-withstanding semiconductor device a fabrication method thereof capable of suppressing Vt fluctuation induced by plasma damage in a via hole forming step. In the high-voltage-withstanding semiconductor device, a gate electrode of a transistor having a gate insulating film formed on a semiconductor substrate and having a thickness of 350 Å or more and a diode composed of a first conductive well region formed in a surface layer region of the semiconductor substrate and a second conductive diffusion layer formed in the surface layer region of the semiconductor substrate and on the well region are electrically connected by a wire directly connected to contacts formed respectively on the gate electrode and the diode, via the contacts.