Preparation of pt/oxygen-doped carbon electrocatalysts based on carbonization of organic alcohols

Abstract

The invention discloses a method for preparing a Pt / oxygen-doped carbon electrocatalyst based on the carbonization of organic alcohols, which comprises the following steps: after mixing and grinding 0.16 g of platinum acetylacetonate and 2.0 g of sodium chloride evenly, pour the mixture into a 250 mL three-necked round-bottomed flask , then add 100ml of organic alcohol, stir at room temperature for 1-2 hours, then heat in an oil bath, when the temperature reaches 100°C, add 1.0g of sodium borohydride dissolved in 50ml of organic alcohol solution dropwise, along with the sodium borohydride After the addition, the solution gradually turns yellow and then black. After the addition, continue to heat up to 150°C, and reflux at 150°C for 10 hours. After the reaction is completed, the solution is naturally cooled to room temperature. The product is washed with ethanol and water for 3-5 times respectively, vacuum After drying, a Pt / oxygen-doped carbon electrocatalyst based on the carbonization of organic alcohols was obtained. Oxygen doping in the carrier carbon in the catalyst obtained in the present invention greatly improves the activity and anti-CO poisoning ability of the catalyst in the electrocatalytic oxidation of methanol.

Description

technical field [0001] The invention belongs to the field of electrocatalytic materials, in particular to a method for preparing a Pt / oxygen-doped carbon electrocatalyst based on the carbonization of organic alcohols. Background technique [0002] Direct methanol fuel cell is recognized as a new energy utilization method because of its high energy conversion efficiency, low pollution emissions, and portability. Pt / C electrocatalysts have always been the preferred catalyst material. However, as an anode catalyst for direct methanol fuel cells, it exhibits poor resistance to CO poisoning, which greatly reduces its stability and durability, hindering its marketization process. At present, doping the support carbon with heteroatoms (oxygen, nitrogen, sulfur, phosphorus, etc.) is a very effective modification method, which can not only improve the ability of the catalyst to resist CO poisoning, but also further improve its catalytic activity. However, this modification often re...

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Problems solved by technology

These steps not only increase the synthesis cost, but also lead to the easy loss of heteroatoms and Pt particles on the carbon support, which reduces the stability of the catalyst.

Therefore, using a simple one-step synthesis method to prepare Pt / heteroatom-doped carbon catalyst materials, allowing heteroatom doping and platinum loading to achieve simultaneous in-situ synthesis on carbon supports, has more application potential, but in-situ synchronous loading and The successful synthesis of doping is very rare, because the synthesis of carbon supports and the doping of heteroatoms generally require higher reaction temperatures, while the loading of Pt only requires room temperature or low temperature conditions, and high temperatures will cause the agglomeration and growth of platinum.

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