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a h 2 Method for preparing carbon-supported PT alloy catalyst by gas-phase thermal reduction

A catalyst, gas-phase technology, applied in the field of electrochemical catalysis, can solve the problem of low utilization rate of Pt

Active Publication Date: 2021-02-12
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since ORR only occurs on the surface of the catalyst, only the surface atoms play a catalytic role, and the utilization rate of Pt in traditional Pt / C catalysts is low.

Method used

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  • a h <sub>2</sub> Method for preparing carbon-supported PT alloy catalyst by gas-phase thermal reduction
  • a h <sub>2</sub> Method for preparing carbon-supported PT alloy catalyst by gas-phase thermal reduction
  • a h <sub>2</sub> Method for preparing carbon-supported PT alloy catalyst by gas-phase thermal reduction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Take 10mL of 0.017mol / L H 2 PtCl 6 aqueous solution, add 4g NH 4 Cl precipitant, stirred at room temperature for 4 hours to obtain primary sediment A; take 2mL of 0.1mol / L CoCl 2 Solution, add 1g oxalic acid, 4mL deionized water, stir at room temperature for 4h to obtain primary sediment B; mix A and B suspensions, add 50mg carbon powder XC-72 aqueous solution, mix and stir for 4h, centrifuge, dry at 80°C, and h 2 / N 2 (20%) pyrolysis and reduction in the mixed gas, the temperature is 350°C, the time is 4h, the heating rate is 5°C / min, after the reaction is completed, use N 2 Replacement of H in the reactor 2 / N 2 Mixed gas, and take out the sample, so as to obtain the highly active H 2 Pt alloy catalyst prepared by thermal reduction method.

Embodiment 2

[0061] Take 10mL of 0.017mol / L H 2 PtCl 6 aqueous solution, add 4g NH 4 Cl, 4g ammonium carbonate, 10mL deionized water, stirred at room temperature for 4h to obtain the primary sediment A'; take 2mL 0.1mol / L CoCl 2 Solution, add 2g oxalic acid, 1g urea, 15mL deionized water, stir at room temperature for 4h, obtain primary sediment B'; mix A' and B' suspensions, add 50mg carbon powder XC-72 aqueous solution, mix and stir for 4h, centrifuge , dried at 80°C, in H 2 / N 2 (20%) pyrolysis and reduction in the mixed gas, the temperature is 350°C, the time is 4h, the heating rate is 5°C / min, after the reaction is completed, use N 2 Replace the H in the reaction furnace 2 / N 2 Mixed gas, and take out the sample, so as to obtain the highly active H 2 Pt alloy catalyst prepared by thermal reduction method.

Embodiment 3

[0063] Electrochemical tests were performed in a three-electrode system to characterize the oxygen reduction activity of the catalysts. The electrolyte solution of this system is 0.1mol L -1 HClO 4 , the counter electrode is a Pt sheet electrode, the reference electrode is a saturated calomel electrode, and the cyclic voltammetry test electrolyte solution is N 2 Saturation, the test system is Gamry3000; ORR test solution is O 2 saturation. Preparation of the catalytic layer of the rotating disk electrode membrane: 40% Pt / C catalyst: 5 mg catalyst, 2.5 mL isopropanol, ultrasonication; add 50 μL of 5wt% Nafion solution, ultrasonication, take 3.2 μL of the above dispersed slurry and coat it on a rotating disk electrode The disc electrode surface, as the working electrode. Due to the low loading of PtCo / C catalyst, preparation of membrane catalyst layer: 5mg catalyst, 2.5mL isopropanol, ultrasonication; add 50μL of 5wt% Nafion solution, ultrasonication, take 10μL of the above ...

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Abstract

The present invention relates to a H 2 A method for preparing a low-platinum Pt-based alloy catalyst by gas-phase thermal reduction, the preparation method comprising the following steps: 1) adding a precipitating agent or a chelating agent to carry out chelation and sedimentation of the Pt precursor; 2) adding a precipitating agent or a chelating agent to carry out Chelation and sedimentation of non-precious metal alloy components; 3) uniformly mixing the sediments in steps 1) and 2) and loading them on a carbon carrier; 4) centrifuging, washing, and drying the resultant in step 3) to obtain a precursor; 5) the precursor in H 2 Pyrolytic reduction under the atmosphere, control the reduction temperature and time, so as to obtain a highly active platinum alloy catalyst. The catalyst forms a nano-polygonal structure and has excellent catalytic activity and stability. The preparation method of the catalyst is simple, and it has the characteristics of adjustable noble metal loading, high activity and stable performance, and has important application value in the field of catalytic oxygen reduction reaction and fuel cell.

Description

technical field [0001] The invention belongs to the technical field of electrochemical catalysis, and in particular relates to a preparation method of a high-performance low-Pt alloy catalyst. The catalyst has good catalytic activity for an oxygen reduction process, and has important value and application in fuel cells and oxygen reduction catalysis processes. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is a device that converts chemical energy into electrical energy. It has the advantages of high energy conversion efficiency, fast startup at room temperature, environmental protection, and no noise. It has been widely used in cogeneration, fixed power stations, transportation, etc. Transportation, portable power supply and other fields (Zhao Zipeng et al., Advanced materials, 2019). Due to the slow kinetics of the oxygen reduction reaction (ORR) at the fuel cell cathode, a large amount of noble metal Pt catalyst is required, resulting in high cos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/92B82Y40/00
CPCB82Y40/00H01M4/8825H01M4/921H01M4/926Y02E60/50
Inventor 赵卿王诚王海峰王建龙唐亚平
Owner TSINGHUA UNIV
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