7 results about "Electrodes platinum" patented technology

The invention belongs to the field of platinum group metal secondary resource recovery, and discloses a one-step photochemical closed-loop recovery method for a platinum-based catalyst of a hydrogen fuel cell membrane electrode, which is a method for exciting an organic acid ferric salt to oxidize and dissolve the platinum-based catalyst of the hydrogen fuel cell membrane electrode in one step under visible light by using an organic lixivium composed of nitrogen-containing amides and chlorine-containing hydrocarbons. Compared with the prior art, the problems of environmental pollution, redundant recovery operation, high recovery cost, low platinum dissolution rate and the like are solved. According to the method for recycling platinum from the hydrogen fuel cell membrane electrode catalyst, the dissolution rate of precious metal can reach about 95%, the optimal dissolution rate can reach 99% or above, and the method is mild in operation condition, low in energy consumption, environmentally friendly, low in carbon and rich in application scene.

The invention discloses an in-situ electrochemical water treatment device and method, and the device comprises an ecological floating island as a main body; the protective shell and the screen are arranged below the ecological floating island; the oxidant loading chamber is arranged in the protective shell; the electrode system comprises a positive electrode, a negative electrode, a platinum sheet electrode clamp and a wire. The device adopts an innovative design and is combined with an automatic response and indication mechanism, so that the automation and intelligence level of water pollutant treatment is effectively improved, and meanwhile, secondary pollution is avoided. According to the working principle, an oxidation-reduction reaction is divided into an oxidation half reaction and a reduction half reaction, and direct contact between an oxidizing agent and a polluted water body is avoided, so that the risk of secondary pollution is reduced. In the device, the existence of pollutants causes the change of the voltage difference between the electrodes to trigger the start of degradation reaction, so that the pollutants can be treated in time. The device is further provided with an indicator lamp, the pollutant treatment progress is indicated through the brightness of the indicator lamp, and the visualization of water pollution treatment is enhanced.

A lithium-mediated electrochemical method for ammonia synthesis, relating to the field of ammonia synthesis technology, solves the technical problems of severe side reactions, limited nitrogen mass transfer, and poor interfacial stability in existing lithium-mediated ammonia synthesis systems. Tetra(4-formylphenyl)porphyrin iron and an amino-containing multifunctional organic ligand are added to a mixed solvent of n-butanol and o-dichlorobenzene. An acid catalyst is added, and after stirring until homogeneous, the mixture is degassed and sealed for reaction. The solid product is collected by centrifugation, washed, and dried to obtain COF powder. This powder is then added to an ethanol-water solution, followed by ultrasonic dispersion with Nafion solution. The powder is then drop-coated / sprayed onto the surface of a carbon paper current collector and dried. This powder is used as the working electrode, with a platinum mesh as the counter electrode, a platinum wire as the quasi-reference electrode, and a LiBF4 tetrahydrofuran solution as the electrolyte. Ethanol is used as the proton donor, and electrolysis is performed under a nitrogen atmosphere using a constant current. This invention can be applied to the field of ammonia synthesis technology.

The invention relates to the technical field of electrochemical luminescence analysis methods, in particular to application of TEAB as an electrochemical luminescence co-reactant and an electrochemical luminescence system. The terpyridyl ruthenium / TEAB system improves the safety, the stability, the sensitivity and the electrode compatibility. TEAB is solid at room temperature, is easy to process, package and store, and is safer. TEAB is odorless, non-toxic and harmless to the environment, so that the TEAB is suitable for clinical diagnosis, field test and other applications with high requirements on safety and cleanliness. TEAB can generate strong and stable equivalent electrochemical luminescence signals on three main electrodes (a glassy carbon electrode, a gold electrode and a platinum electrode), and the applicability of TEAB on different electrochemical platforms is widened. TEAB has good water solubility and is close to neutral, a high-concentration acidic buffer solution does not need to be used for preparation, and the solution preparation is simple. High-sensitivity detection of the terpyridyl ruthenium can be realized, and the method is widely applied to electrochemical luminescence analysis of the terpyridyl ruthenium.

The invention relates to the technical field of detection for judging drug preparation completeness by detecting HMF content, in particular to a renewable biosensor for detecting preparation of carbohydrate-containing drugs, which comprises a biosensor core, a composite coated film electrode assembly, an environment adaptation module, a signal conversion module and a data transmission module, the biosensor core comprises a mesoporous SiO2 protective shell and a Fe-Zr double metal coated GOase immobilized enzyme; the composite coating film electrode assembly comprises a multi-layer gradient composite coating film, a glassy carbon working electrode, a saturated calomel reference electrode and a platinum wire counter electrode; the environment adaptation module comprises a stir-frying scene adaptation unit and a cooking scene adaptation unit, and is internally provided with a high-temperature cooling and heat insulation device. GOase is fixed by a Fe-Zr bimetal frame through a biosensor core, and a mesoporous SiO2 protective shell and a multi-layer gradient composite coating film are matched, so that the immobilized enzyme effectively resists a high-temperature and high-humidity environment in the processing process, and meanwhile, the detection sensitivity and accuracy are ensured.

The application relates to a sandwich structure quartz resonator and an optimization method thereof and a hydrogen sensor. The quartz resonator comprises metal electrodes and a quartz light plate; the metal electrodes are arranged on the upper and lower sides of the quartz light plate to form a sandwich structure; the lower metal electrode comprises a platinum electrode and a chromium electrode which are sequentially arranged in layers from bottom to top; the upper metal electrode comprises a first electrode and a second electrode which are arranged at intervals along the length direction of the quartz light plate; the first electrode comprises a chromium electrode, a gold electrode and a platinum electrode which are sequentially arranged in layers from bottom to top; the second electrode comprises a chromium electrode and a gold electrode which are sequentially arranged in layers from bottom to top; and the thickness of the platinum electrode is 0.2 mu m. The quartz resonator with the optimized thickness of the platinum electrode realizes good decoupling characteristics and energy trapping effect of the quartz resonator, reduces the interference of the resonator parasitic mode during the working of the sensor, reduces energy loss, improves the working performance of the quartz resonator, and further improves the sensitivity of the sensor.

This invention discloses a graphene electrode for detecting chromium (VI) ions in aquatic environments and its applications, belonging to the field of water quality testing technology. This invention utilizes a laser-induced graphene method to fabricate working, counter, and reference electrode regions on a polyimide (PI) film substrate, integrating the three-electrode system onto the same substrate. Simultaneously, the working electrode region is modified with a Fe3O4@PANI / Ce-MOF composite material exhibiting excellent electrochemical performance for the detection of hexavalent chromium in aquatic environments. The modified laser-induced graphene electrode can replace commercially available working (glassy carbon), counter (platinum wire), and reference (Ag / AgCl) electrodes, enabling mass production of the electrode. This not only reduces detection costs but also provides the integrated electrode with a degree of flexibility, making it simple and convenient to use and possessing higher practical value.