Preparation method of nano porous metal electrode material
A nanoporous gold and metal electrode technology, applied in the field of nanoporous metal material science, can solve the problems that hinder the development and application of porous metal materials, over-corrosion hole frame structure, and insufficient advantages, so as to avoid electron transfer resistance and improve the reaction surface The effect of activity and good battery performance
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[0027] The preparation method of precursor porous gold is to cut a 100nm gold-silver film into 2cm×2cm size, put it in dilute nitric acid (30wt.%), and keep it at 30°C for 30min, and selectively corrode silver under 80W ultrasonic power, Gold diffuses freely to form a continuous open-pore structure.
[0028] Example 3 Electrochemical modification of gold-silver alloy thin films
[0029] The precursor was electrochemically modified. The system used was a three-electrode system. Differential conventional pulse voltammetry was used. The working electrode was porous gold, the graphite carbon plate was the counter electrode, and the saturated calomel electrode was the reference electrode. The porous gold is attached to the copper paper on the glass plate, the high potential is 0.3V, and the low potential is 0.2V. The number of scanning cycles varies according to the platinum loading. The platinum loading of the electrode material we obtained in this experiment is controlled at 50μg...
Embodiment 4
[0030] Example 4 Preparation of Membrane Electrodes
[0031] We fished the prepared sample material on a proton exchange membrane (N211) and then sandwiched it between two gas diffusion layers (GDL). Under a pressure of 0.75MPa, it was incubated and pressurized at 135°C for 180 seconds to obtain 1cm 2 area of the membrane electrode, the final membrane electrode such as figure 1 shown. GDL is from Shanghai Hesen Electric Co., Ltd. The prepared membrane electrodes were then sandwiched between two graphite end plates with a serpentine flow field, and a gasket was placed between the membrane electrodes and each graphite end plate.
Embodiment 5
[0032] Embodiment 5 Detection of electrical properties
[0033] We use the 850eMulti-Range Fuel Cell Test System (Scribner Associates Inc.) to complete cell performance testing. H 2 and O 2 Gases are used for the anode and cathode, respectively. Humidification H 2 and O 2 The flow rates into the anode and cathode, respectively, were 200 mL / min. Apply this flow to obtain a uniform and stable gas distribution. Humidity was controlled at 70% RH to avoid flooding. The pressure during the experiment was 150 kPa. The I-V curve obtained by the experimental test is as follows figure 2 shown.
[0034] from figure 2 It can be seen that the performance of the fuel cell (NPG-Pt) prepared by the method of the present invention is obviously better than that of the carbon-supported Pt / C.
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