Preparation method of palladium nano-catalyst for DFAFC (direct formic acid fuel cell)

A technology of formic acid fuel cell and palladium nanometer, applied in nanotechnology for materials and surface science, battery electrodes, nanotechnology, etc., can solve the problems of difficult realization of catalyst and commercial application, increased cost of catalyst, complicated process, etc. Achieve good catalytic activity and stability, improve Pd utilization, and simple process

Inactive Publication Date: 2019-05-03
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially in the scale-up preparation and mass production of catalysts, precise control of experimental conditions is required, and the process is complicated, which makes it difficult to realize the commercial application of catalysts.
At present, commercial noble metal catalysts are usually prepared by reducing precursors with hydrogen under high temperature conditions. This method consumes too much energy and increases the cost of catalysts. A simple, mild and green synthesis method is urgently needed to prepare palladium nanocatalysts at high concentrations.

Method used

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  • Preparation method of palladium nano-catalyst for DFAFC (direct formic acid fuel cell)
  • Preparation method of palladium nano-catalyst for DFAFC (direct formic acid fuel cell)
  • Preparation method of palladium nano-catalyst for DFAFC (direct formic acid fuel cell)

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Embodiment 1

[0032] 1) Add 40 mg of activated carbon to 20 mL of ethylene glycol, and disperse with ultrasonic and magnetic stirring for 15 min to obtain a suspension of activated carbon;

[0033] 2) Under ultrasonic and magnetic stirring, PdCl containing 10 mg Pd 2 The solution is added to the suspension, and soaked for 1-2 hours to obtain an impregnation solution;

[0034] 3) adjusting the pH of the impregnation solution to 10.5 with NaOH aqueous solution to obtain a colloidal solution;

[0035] 4) Stir the colloidal solution for 2 hours, then pass in argon to exhaust oxygen for 30 minutes;

[0036] 5) Dissolve 178mg of sodium borohydride in 10mL of 0.001M NaOH aqueous solution as a reducing agent, quickly and evenly add the reducing agent into the colloidal solution, and continue stirring for about 2 hours to completely reduce the palladium metal precursor;

[0037] 6) After filtering and washing, the obtained product was vacuum-dried at 80° C. for 10 h, and ground to obtain a palladi...

Embodiment 2

[0044] Preparation of high-dose Pd / C catalyst:

[0045] The steps in Example 1 were enlarged proportionally, 400 mg of activated carbon was added to 200 mL of ethylene glycol, and ultrasonically and magnetically stirred to disperse for 15 min to obtain a suspension of activated carbon; under ultrasonically and magnetically stirred, the PdCl 2 The solution is added to the suspension, and soaked for 2-4 hours to obtain an impregnation liquid; the pH of the impregnation liquid is adjusted to 10.5 with NaOH aqueous solution to obtain a colloidal liquid; after the colloidal liquid is stirred for 2 hours, argon gas is introduced to exhaust oxygen 30min; 1780mg of sodium borohydride was dissolved in 100mL of 0.001M NaOH aqueous solution as a reducing agent, and the reducing agent was added into the colloid liquid by means of multi-point addition, and the stirring reaction was continued for about 3 hours to completely reduce the palladium metal precursor; then filtered, After washing...

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Abstract

The invention discloses a preparation method of a palladium nano-catalyst for a DFAFC (direct formic acid fuel cell), and the method comprises the following preparation steps: 1) dispersing a carbon carrier in ethylene glycol to obtain suspension liquid; 2) adding a medium palladium metal precursor to the suspension liquid obtained at the step 1), and performing full impregnating to obtain impregnating solution; 3) adjusting the pH value of the impregnation liquid obtained at the step 2) to obtain colloidal liquid; 4) introducing argon into a colloidal liquid system, and removing oxygen dissolved in the system; 5) adding sodium borohydride-sodium borohydride to the system under the temperature of 25-45 DEG C, and continuously stirring the solution for reaction for several hours and then performing aging; 6) carrying out suction filtration, washing and drying of the reaction final product to obtain a product. The preparation method provided by the invention is simple in process and goodin reproducibility, and the prepared palladium-based catalyst is uniform in distribution, has good catalytic activity and stability when being used for direct formic acid oxidation. Moreover, the preparation conditions are relatively moderate, and the method is suitable for industrial large-scale production.

Description

technical field [0001] The invention belongs to the field of fuel cell material science and technology and the field of electrocatalyst technology, and relates to a preparation method of palladium nano-catalyst for direct formic acid fuel cell. Background technique [0002] In recent years, research on direct formic acid fuel cells (DFAFCs) has attracted much attention. The advantages of formic acid as a liquid fuel are: (1) non-toxic, non-flammable, convenient and safe for storage and transportation; (2) compared with methanol, formic acid has higher electrochemical oxidation catalytic activity, which can be seen from the Gibbs free energy calculation, The electromotive force of DFAFC is higher than that of direct methanol fuel cell (DMFC). Under standard conditions, the theoretical open circuit voltage of DFAFC is 1.48 V; There is electrostatic repulsion between anions, and the permeability of formic acid to the Nation membrane is much lower than that of methanol; (4) The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/92B82Y30/00
CPCY02E60/50
Inventor 陈金伟张洁罗艳王刚王瑞林
Owner SICHUAN UNIV
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