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Method of modifying platinum base formic acid electrocatalyst

An electrocatalyst, platinum-based formic acid technology, applied in the field of electrochemical catalysis, can solve the problems of difficult realization, unsuitable catalyst production, complex process and the like

Inactive Publication Date: 2012-11-14
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Obviously, this method is complicated and requires the control of external potential, and it is also not suitable for the production of practical large-scale catalysts.
[0004] In previous related studies, as far as the material itself is concerned, most of the surface modification of Sb is concentrated on the Pt single crystal or polycrystalline bulk electrode, which is far from the practical DFAFC anode catalyst; in terms of modification methods , whether it is the UPD process itself or the IRA / UPD full single layer of Sb and then changing the coverage of Sb, it is necessary to apply the control of an external potential, which is difficult to achieve in mass production

Method used

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  • Method of modifying platinum base formic acid electrocatalyst
  • Method of modifying platinum base formic acid electrocatalyst
  • Method of modifying platinum base formic acid electrocatalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Weigh a certain amount of Pt / C catalyst (Pt loading is 60%), disperse in ultrapure water for 1 h under ultrasonic conditions, and then mix with 0.1-10×10 -3 mol / L antimony potassium tartrate and 1-20×10 -3 Mix mol / L L-ascorbic acid aqueous solution, continue to ultrasonically disperse for 0.5-10min, filter and wash with ultrapure water several times to remove impurity ions, and dry under vacuum at 50°C to obtain Pt-Sb / C powder.

Embodiment 2

[0022] Weigh a certain amount of Pt / C catalyst (Pt loading is 60%), disperse in ultrapure water for 1 h under ultrasonic conditions, and then mix with 0.1-10×10 -3 mol / L antimony potassium tartrate and 1-20×10 -3 Mix mol / L hydrazine hydrochloride aqueous solution, continue to ultrasonically disperse for 0.5-10min, filter and wash with ultrapure water several times to remove impurity ions, and dry under vacuum at 50°C to obtain Pt-Sb / C powder.

Embodiment 3

[0024] Weigh a certain amount of Pt / C catalyst (Pt loading is 60%), disperse in ultrapure water for 1 h under ultrasonic conditions, and then mix with 0.1-10×10 -3 mol / L antimony trioxide and 1-20×10 -3 Mix mol / L L-ascorbic acid + 0.1-1mol / L sulfuric acid solution, continue ultrasonic dispersion for 0.5-10min, filter and wash with ultrapure water several times to remove impurity ions, and dry under vacuum at 50°C to obtain Pt-Sb / C powder.

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Abstract

The invention belongs to the technical field of electrocatalysis, relating to a method of modifying and strengthening electrocatalytic activities of formic acid by platinum base materials and improving stability thereof. The Pt base catalyst and an anionic salt of Sb are mixed and dispersed with a reductant under the ultrasonic condition, the reaction time is controlled to obtain the desired Theta sh, and the Theta sh is rapidly filtered, repeatedly washed and vacuum dried at a temperature of 50 DEG C for overnight, thereby obtaining the carbon-carrying platinum catalyst Pt-Sb / C modified by antimony. The method has the advantages that the method is simple and the modified condition is moderate and friendly; the method not only can be used in the Pt body electrode, but also is more suitable for preparation of large-batch catalytic materials; compared with the traditional catalyst, the formic acid catalyzing electrochemical oxidized activity of the obtained product is greatly improved; the obtained product has the excellent electrocatalytic oxidized activity to formic acid and is the promising direct formic acid fuel battery anode catalyst; and the anti-CO poisoning ability is increased.

Description

technical field [0001] The invention belongs to the technical field of electrochemical catalysis, and relates to a method for modifying a platinum-based formic acid electrocatalyst, in particular to a method for modifying and enhancing the activity of a platinum-based material electrocatalyzing formic acid and improving its stability. Background technique [0002] Research shows that compared with direct methanol fuel cell (DMFC), direct formic acid fuel cell (DFAFC) has a higher electromotive force, and its fuel formic acid is not only non-toxic but also has a far lower permeability to Nafion membrane than methanol, which can be used in high concentration In DFAFC, DFAFC has thus become a hot field of portable energy research (X.W.Yu, P.G. Pickup, J. Power Sources 182(2008) 124.). Among them, the performance of the catalyst for the electrooxidation of formic acid used in the DFAFC anode is a decisive parameter. Pt-based materials are a class of commonly used catalysts for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/644B01J37/16B01J37/00H01M4/92
CPCY02E60/50
Inventor 蔡文斌彭斌王金意
Owner FUDAN UNIV
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