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Method for increasing platinum activity through surface modification

A technology of surface modification and activity, which is applied in the field of preparation of high-activity direct fuel cells, can solve the problems of high production cost and difficulty in wide application, achieve simple application methods, maintain the ability of catalytic oxidation of alcohols, and reduce the amount of use Effect

Inactive Publication Date: 2006-03-08
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
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Benefits of technology

This patented technology uses different chemical agents called lithiocarbons (LSC) for modifying surfaces on anodes and cathode materials like those described earlier. By doing this, less expensive metals can be utilized while still having good activity at reducing CO2. Layered double hydroxides have been developed from soda ash through various methods such as ion exchange resins, solvent extraction techniques, precipitation-based synthesis, etc., resulting in improved properties over existing products. Overall, this process allows for more efficient use of noble metal resources without sacrificing their functioniveness during manufacturing processes.

Problems solved by technology

The technical problem addressed in this patented text relates to lower costs while maintaining or increasing efficiency when producing alcohols from direct methane fuel cells due to improved performance and durable materials needed during operation.

Method used

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  • Method for increasing platinum activity through surface modification
  • Method for increasing platinum activity through surface modification
  • Method for increasing platinum activity through surface modification

Examples

Experimental program
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Effect test

Embodiment 1

[0018] 1M methanol+1M sulfuric acid was used as the reaction solution, and a surfactant solution of 1M methanol+1M sulfuric acid+sodium lauryl sulfate was gradually added dropwise. Both the working electrode and the auxiliary electrode are platinum electrodes, and the results obtained by applying the cyclic voltammetry method are shown in the attached figure 2 . Depend on figure 2 It can be seen that the oxidation peak is constantly rising, which indicates that the oxidation current is increasing, and the oxidation rate of methanol has been increased. In the case of no change in any other conditions, this fully shows that the active point of platinum has increased.

[0019] Analysis of the oxidation peak at 0.62V yielded an attached image 3 . Depend on image 3 It can be analyzed that when the addition amount is less than 0.055g / ml, the oxidation current increases with the increase of the addition amount. Instead, a plateau appeared between 0.055 g / ml and 0.08 g / ml, wh...

Embodiment 2

[0023] 1M methanol + 1M sulfuric acid was used as the reaction solution, and a surfactant solution of 1M methanol + 1M sulfuric acid + diammonium hydrogen citrate was gradually added dropwise. Both the working electrode and the auxiliary electrode are platinum electrodes, and the results obtained by applying the cyclic voltammetry method are shown in the attached Figure 7 . Depend on Figure 7 It can be obtained that the retrace peak decreases while the oxidation peak does not change. This indicates that the adsorption of carbon monoxide is reduced without destroying the active sites of platinum.

[0024] The oxidation peak at 0.62V and the retrace peak at 0.41V were analyzed to obtain the attached Figure 8 . attached by Figure 8 It can be obtained that when the addition amount is 0.015g / ml, the current of the oxidation peak does not change much, while the current of the retrace peak decreases rapidly, and the current of the oxidation peak from 0.015 to 0.035g / ml is th...

Embodiment 3

[0026] 1M methanol + 1M sulfuric acid added with 0.08g / ml sodium lauryl sulfate and 0.015g / ml diammonium hydrogen citrate was used as the reaction solution, and the working electrode and the auxiliary electrode were both platinum electrodes. The system was subjected to cyclic voltammetry and compared with the cyclic voltammetry of 1M methanol + 1M sulfuric acid without adding any other reagents, to obtain Figure 9 . From Figure 9 The following conclusions can be drawn: the oxidation peak increases and the retrace peak decreases. This just corresponds to the results of Example 1 and Example 2, indicating that the addition of these two surfactants also has the effect of increasing the active point of platinum.

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Abstract

The present invention relates to a preparation of high-activity direct fuel cell. It utilizes surface modification method to treat electrode and catalyst surface, and said method includes the following steps: in the acidic solution of methyl alcohol adding two surfactants of sodium dodecanesulphonate or hydrogen diamine citrate, also can mix two solutions in which the sodium dodecanesulphonate or hydrogen diamine citrate is respectively added according to a certain ratio. The adoption of said method not only can raise electric catalytic capability of platinum for acidic solution of the methyl alcohol so as to raise oxidation speed of methyl alcohol, but also the application of surfactant can reduce adsorption quantity of carbon monoxide on the platinum electrode, so that the toxicant action of carbon monoxide to platinum electrode can be reduced.

Description

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Claims

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Application Information

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Owner UNIV OF SCI & TECH BEIJING
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