9 results about "Electrochemical electrode" patented technology

A bio-electrochemical electrode current control system for improving the performance of bio-electrochemical systems is provided. The system comprises at least a pair of bio- electrochemical electrodes disposed inside a vessel of a bio-electrochemical system. The bio- electrochemical electrodes have a large surface area in contact with an operating fluid disposed in the vessel. An electric power source is operatively connected to each pair of the at least a pair of bio-electrochemical electrodes such that in operation the bio- electrochemical electrodes of each pair of the at least a pair of bio-electrochemical electrodes have a polarity corresponding to one anode and one cathode. A polarity switching circuitry is interposed between the electric power source and each pair of the at least a pair of bio- electrochemical electrodes for simultaneously switching the polarity of the bio- electrochemical electrodes of each pair of the at least a pair of bio-electrochemical electrodes. A processor is operatively connected to the polarity switching circuitry. The processor is adapted for controlling the polarity switch such that the polarity is repeatedly switched after elapse of a preset switching time interval greater than about one second. In operation, the operating fluid is bio-electrochemically processed while the electric current is provided to each pair of the at least a pair of bio-electrochemical electrodes such that the polarity of the bio-electrochemical electrodes of each pair of the at least a pair of bio- electrochemical electrodes is repeatedly switched.

This invention discloses a carbon monoxide sensor and its filter preparation method. The filter comprises an activated carbon cloth layer and a thin film layer formed by slurry printing; the slurry contains, by mass, 20-60 parts of metal oxide, 5-10 parts of binder, 8-15 parts of dispersant, 40-80 parts of carrier, and 50-80 parts of solvent. In the preparation process, the metal oxide and dispersant are first mixed in ultrapure water, dried at 135°C, and crushed. Then, the mixture is ball-milled with the binder, carrier, and solvent to obtain the slurry. Finally, the slurry is printed onto a breathable substrate using a steel mesh or screen printing process to form a film. This sensor utilizes the activated carbon cloth to preferentially adsorb most organic vapors. Simultaneously, the metal oxide, after modification with the dispersant, has increased surface active sites, which can further catalyze the oxidation or chemical adsorption of residual organic vapors, effectively suppressing their poisoning or cross-interference on the electrochemical electrode. The printed thin film is dense and uniform, and combined with the ball milling composite process, it significantly improves the resistance to organic vapor interference, ensuring the selectivity and long-term stability of CO detection.

This invention relates to a method for generating at least one long-half-life free radical via an electrochemical device having suitable electrode plates. The method comprises the steps of: passing an aqueous solution containing a contaminant to be removed through at least one pair of electrodes, through which a DC current is passed, such that at least one long-half-life free radical is generated, which initiates a persistent (i.e., continuous) chain reaction that consumes or degrades any contaminant, wherein the DC current is controlled to keep the potential difference across the electrochemical electrodes at a controlled rate, thereby reaching a precise value within a specific time.

The application provides an electrode preparation method by periodical deposition, and belongs to the technical field of electrochemical electrode preparation, which comprises the following steps: preparing a nanomaterial hyperdispersion stabilizing aid containing a non-ionic block copolymer dispersant and modified nanosilica; preparing a composite electrolyte containing a main salt, a buffer, a conductive agent, an additive, the nanomaterial hyperdispersion stabilizing aid and a composite electrolyte additive; after pretreating a substrate, placing the substrate in the composite electrolyte; adopting a nucleation deposition of a forward square wave pulse, a structure construction deposition of a variable duty cycle pulse, a functional gradient deposition of a multistage composite pulse and a surface modification deposition of a high-frequency symmetric pulse in a fourth stage; and post-treating the deposited electrode; through the synergy of the functional aid system and the multistage deposition process, the electrode prepared by the method has the comprehensive advantages of good thickness uniformity, strong bonding force, high electrochemical activity, excellent cycle reversibility and high structural stability.

The application belongs to the technical field of electrochemical sensors, and discloses a kind of ion liquid gel microsphere composite electrode loaded with MXene and its preparation method and application in electrochemical detection of p-aminophenol.The preparation method is as follows: prepare a few-layer MXene aqueous solution, prepare PMMA / BMIMPF6 gel microsphere powder aqueous dispersion, add PMMA / BMIMPF6 gel microsphere dispersion to MXene aqueous solution, stir, ultrasonic oscillation, filter, wash, collect filter cake, freeze-drying to prepare PMMA / BMIMPF6 / MXene powder, take the above-mentioned powder and disperse it in anhydrous ethanol, ultrasonic oscillation, drop to carbon cloth, air dry, place at room temperature, make the electrode material and carbon cloth fully combined, and prepare PMMA / BMIMPF6 / MXene / CC composite electrode.The application not only provides a new electrochemical sensing scheme for efficient, rapid and economical detection of phenolic pollutants such as p-aminophenol in water environment, but also provides a new idea for the design and development of functional composite electrochemical electrode materials.

This application provides a trajectory-controllable electrochemical ultra-precision polishing apparatus and method for cylindrical rollers. The apparatus includes a transmission positioning group, an electrochemical electrode, and a processing fluid supply assembly. The transmission positioning group supports the cylindrical roller to be processed, and the cylindrical roller and the transmission positioning group are arranged in a triangular structure. The transmission positioning group drives the cylindrical roller to be processed to roll. The transmission positioning group is connected to the positive terminal of an external power supply, and the cylindrical roller to be processed serves as the electrochemical processing anode through line contact. The electrochemical electrode is connected to the negative terminal of the external power supply, serving as the electrochemical processing cathode. The processing fluid supply assembly sprays conductive processing fluid into the processing gap to remove the corrosion layer on the surface of the cylindrical roller to be processed, thus completing the electrochemical polishing process. This application eliminates the processing quality fluctuation problem caused by the instability of friction force in traditional friction polishing, making the surface motion trajectory of the cylindrical roller to be processed precise and controllable, meeting the processing requirements of high-precision cylindrical rollers.

This invention provides a porous iridium-based titanium anode with high bonding strength for electrochemical descaling and its preparation method, relating to the field of electrochemical electrode material preparation technology. The aforementioned porous iridium-based titanium anode is constructed by sequentially preparing a TiO2-SnO2 composite layer, a SnO2-IrO2 composite transition layer, and an IrO2 glaze layer on the surface of a titanium substrate, and then constructing a porous iridium electrodeposition layer using a PS microsphere template method. The PS microsphere template method creates a highly ordered porous array, significantly improving the effective reaction area and ion diffusion efficiency of the electrode, directly translating into an excellent descaling rate. Furthermore, strong chemical bonds are formed between the various layers, endowing the anode with excellent stability. By controlling the electrolyte composition for preparing the iridium electrodeposition layer, uniform deposition of IrO2 within the pores can be ensured, giving the anode excellent electrochemical descaling performance.

There is provided a ceramic heater including: a ceramic plate including a first surface, and a second surface; a first RF / ESC electrode embedded in the ceramic plate; a second RF / ESC electrode electrically connected to the first RF / ESC electrode, and embedded at a depth position farther from the first surface than the first RF / ESC electrode; an RF / ESC rod including one end electrically connected to the second RF / ESC electrode; an RF / ESC terminal hole being a bottomed hole into which a front end part of the RF / ESC rod is inserted; and a heater circuit embedded at a depth position closer to the second surface than the second RF / ESC electrode. A distance between a center line of the first RF / ESC electrode and that of the second RF / ESC electrode is 2 to 7 mm. A distance from the first surface to a hole bottom of the RF / ESC terminal hole is 4 to 9 mm.

The invention discloses a nickel-based amorphous alloy micro-nano structure composite electrode. The electrode is prepared by combining a hydrogel template method with magnetron sputtering. The composite electrode takes a copper micro-nano framework as a substrate, and a NiMoNb amorphous film is uniformly coated on the surface of the copper micro-nano framework to form a composite structure with unique mechanical and electrochemical characteristics. The composite electrode disclosed by the invention not only has excellent mechanical strength and corrosion resistance, but also has application potential in the field of electrochemical sensing. Compared with a traditional micro-nano structure preparation method, the corrosion resistance and the mechanical strength are remarkably improved through a simple and efficient preparation process, and application potential is shown in the field of electrochemical sensing. According to the material system disclosed by the invention, by combining the advantages of different materials, a new choice is provided for high-performance three-dimensional integrated electrochemical electrodes and other functional materials.