Gas diffusion layer material, electrode containing gas diffusion layer material, and preparation and application
A gas diffusion electrode and gas diffusion layer technology, which is used in fuel cells, battery electrodes, circuits, etc., can solve the problems such as the inability to realize the regulation of material transmission paths, the high price of carbon fiber materials, and the scattered distribution of pore structures. Transport, improve electrochemical performance, and facilitate the effect of transport
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Embodiment 1
[0069] refer to figure 1 The flow chart of the preparation process is shown to illustrate the method of the present invention in detail.
[0070] First of all, use foam metal and other high-permeability hard and high-temperature-resistant materials to assemble and combine with selected wood to form a sandwich structure and fix it to form a sandwich. The purpose of assembling into a sandwich structure is to prevent the tortuosity caused by volatilization of substances during the carbonization process of wood. The sandwich structure was placed in the protective gas with argon flow rate of 50mL / min, heating rate of 5°C / min, temperature raised to 800°C, carbonization time of 2 hours, and natural cooling. Then cut the carbonized wood base into 2*2cm 2 size material.
[0071] Then, a methanol solution of 0.036-0.06 mol / L of cobalt salt and a methanol solution of 0.36-0.6 mol / L of urea are mixed at a volume ratio of 1:1, and the ultrasonic method is used to prepare a reaction moth...
Embodiment 2
[0075] This embodiment 2 provides a specific preparation method of a wood-based gradient wettable gas diffusion electrode:
[0076] a: The 300 μm thick cherry wood cross-section material was assembled into a sandwich structure with nickel foam and fixed. Under the conditions of argon flow rate of 50mL / min, heating rate of 5°C / min, temperature rising to 800°C, holding time of 2h, carbonization and natural cooling. Cut the obtained sample into 2*2cm 2 Size, get carbonized wood material.
[0077] b: Mix 20ml of methanol solution in which 0.29g of cobalt nitrate hexahydrate is dissolved and 20ml of methanol solution in which 0.6g of urea is dissolved, and transfer to the reaction kettle containing the carbonized wood material obtained in a after ultrasonication, and seal it. After reacting in an oven at 120°C for 12 hours, the reactor was naturally cooled to room temperature and the carbonized wood material loaded with pink substances was taken out.
[0078] c: Weigh 2g of mela...
Embodiment 3
[0094] The pore size distribution, air permeability, F element distribution, gradient wettability and electrochemical performance of the electrodes prepared in Embodiment 2 and Comparative Example 1 were respectively tested and compared.
[0095] 1. Pore size distribution:
[0096] Figure 9 It is the N2 adsorption-desorption isotherms tested by the electrodes prepared respectively in Example 2 and Comparative Example 1, and the inset is the pore size distribution (calculated from the N2 isotherm adsorption branch using the BJH method). in, Figure 9 A test sample is based on the carbon fiber paper-based gas diffusion electrode prepared in Comparative Example 1; Figure 9 b The test sample is the wood-based gradient wettable gas diffusion electrode prepared in Example 2.
[0097] For carbonized wood materials, in addition to the electron microscope Figure 2~3 It can be seen that there are neat micron-sized pores on the surface, Figure 9 In b, it can also be seen from th...
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