7 results about "Carbon corrosion" patented technology

The present invention provides a membrane electrode assembly for preventing reverse voltage of a fuel cell, comprising an electrolyte membrane between a positive electrode and a negative electrode, in which the positive electrode and the negative electrode each comprise a supported catalyst in which a metal catalyst is supported on a support, wherein the ratio MCL / R between the metal catalyst loading amount MCL in the negative electrode and the loaded metal catalyst ratio R is 0.125 to 0.3. This membrane electrode assembly can prevent an overflow phenomenon that may occur in cold start driving or fast acceleration driving by appropriately controlling physical property factors associated with a fuel cell negative electrode. Thus, this membrane electrode assembly can suppress carbon corrosion at the negative electrode and improve durability.

This invention discloses a Pt / O-NCP catalyst and its preparation method. It utilizes self-developed nanoporous carbon (NCP) as a support, which is modified to change the internal pores from a hydrophobic to a hydrophilic state. A special preparation method is then used to obtain the noble metal catalyst Pt / O-NCP. During catalyst loading, most Pt nanoparticles are located within the mesopores of the support, maximizing the direct contact between the polymer and Pt (sulfonic acid poisoning). This solves the problems in existing catalysts where Pt nanoparticles are prone to dissolution and carbon corrosion under voltage fluctuations, leading to Pt growth and aggregation, thus avoiding the reduction in catalytic performance caused by a decrease in the active surface area of ​​the catalyst. Furthermore, this catalyst can also address the significant decrease in overpotential of ordinary carbon support materials under low humidity, resolving the typical performance degradation of PEMFCs under low humidity conditions.

This utility model discloses a high-sealing, carbon dioxide corrosion-resistant, heat-insulating oil casing, specifically relating to the field of heat-insulating oil casing technology. It includes a pipe body and a coupling. The coupling is threadedly connected to the outer end of the pipe body. A fixing plate is fixedly installed on one side of the outer surface of the pipe body. The fixing plate has multiple fixing holes inside, and two springs are fixedly installed on the inner top surface of each fixing hole. In practical operation, the end of the pipe body is inserted into the coupling and rotated to achieve a threaded connection. Under the elastic action of the springs, a limiting hook extends to the side outside the fixing hole and inserts into the limiting hole of the connecting plate, thus engaging with the threaded connection to assemble and connect the pipe body and the coupling. The elastic force of the springs provides continuous clamping force, effectively offsetting the preload attenuation caused by vibration. The insertion and engagement of the limiting hook and the limiting hole further restricts axial displacement, effectively preventing loosening between the pipe body and the coupling from affecting the transport of heavy oil.

The present invention provides a film electrode assembly with high carbon corrosion resistance. [Solution] The membrane electrode assembly comprises an anode-side electrode catalyst layer, a solid polymer electrolyte membrane, and a cathode-side electrode catalyst layer in this order. The anode-side electrode catalyst layer and the cathode-side electrode catalyst layer each contain catalyst particles, a carbon support carrying the catalyst particles, and a polymer electrolyte, and the volume density of the anode-side electrode catalyst layer is smaller than the volume density of the cathode-side electrode catalyst layer.

The invention discloses a platinum cluster enhanced electro-catalytic oxygen reduction activity catalyst, catalyst slurry, a working electrode and a preparation method, the catalyst comprises a graphite flake loaded with a low loading amount of Pt nanocluster, namely Pt-D / O-C; wherein the low loading capacity is less than 1.5 wt%. According to the present invention, the cheap, easily available and efficient carbon material is adopted as the electrode, such that the operation is simple, the carbon electrode has good stability and can be recycled for multiple times, the ORR activity can be enhanced and the cost can be reduced in the aspect of the effect, the problems of carbon corrosion, Pt aggregation and the like during the reaction process can be avoided, and the great application potential in the industry can be provided. Meanwhile, the catalyst slurry, the working electrode and the preparation method provided by the invention also have the same effect.

The application provides a control method for eliminating high potential of fuel cell start-stop, comprising: obtaining the stack operation state of a fuel cell system, obtaining the cathode potential data of the stack under the start condition and the shutdown condition based on the operation state; judging whether the fuel cell system is in a high potential state according to the cathode potential data, and triggering a recovery module to perform a high potential elimination operation if the fuel cell system is in the high potential state. The stack is monitored in real time, and the working condition of the fuel cell is dynamically adjusted, so that the purpose of reducing the cathode high potential condition is achieved, and the fuel cell stack can work efficiently for a long time. The occurrence of the cathode high potential is reduced by controlling the adjustable load element, and the carbon corrosion problem is further inhibited; the occurrence of the high potential is reduced, so that the attenuation of the fuel cell performance caused by the carbon corrosion under the high potential condition is reduced, and the service life of the fuel cell is prolonged.

The application discloses a carbon-based coating of a fuel cell metal bipolar plate and a preparation method thereof. The carbon-based structure coating of the metal bipolar plate comprises, from top to bottom, a conductive functional amorphous carbon layer, a compact amorphous carbon corrosion barrier layer and a flexible metal Ti transition layer. The flexible metal Ti transition layer is prepared by a magnetron sputtering process, the sputtering target material is pure metal Ti, and the thickness of the flexible metal Ti transition layer is 100 nm. The carbon material is used as the main body of the coating, so that the preparation cost of the protective coating can be effectively reduced. The amorphous carbon coating prepared by the magnetic filtering cathode vacuum arc technology and the cathode vacuum arc technology can effectively shorten the deposition time and improve the production efficiency. After the prepared carbon-based protective coating is subjected to constant potential corrosion at 0.6 V for 7200 min, the surface morphology of the coating does not change, and the contact resistance of the coating still meets the use standard.