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A kind of non-precious metal electrocatalyst for fuel cell and preparation method thereof

An electrocatalyst, non-precious metal technology, applied in the field of non-precious metal fuel cell oxygen reduction electrocatalyst and its preparation, can solve the problems of ambiguous research on electrocatalytic oxygen reduction performance active sites, complex catalyst preparation process, harsh reaction conditions, etc. Good stability, good electrocatalytic activity, and strong controllability

Inactive Publication Date: 2016-04-27
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the current platinum-based catalysts, these non-platinum catalysts are comparable in terms of catalytic activity under alkaline conditions, but there is still a gap, especially in acidic systems with weaker stability and electrocatalytic oxygen reduction performance. The research on active sites is relatively vague, and the preparation process of such catalysts is relatively complicated and the reaction conditions are harsh.

Method used

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  • A kind of non-precious metal electrocatalyst for fuel cell and preparation method thereof
  • A kind of non-precious metal electrocatalyst for fuel cell and preparation method thereof
  • A kind of non-precious metal electrocatalyst for fuel cell and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The synthesis process of the electrocatalyst used in the PEMFC (proton-exchangemembranefuelcells proton-exchange membrane fuel cells) of the present embodiment can be found in figure 1 ,Specifically:

[0033] 0.2mmol molybdenum hexacarbonyl (Mo(CO) 6 ) with 0.2mmol cobalt acetylacetonate (Co(acac) 2 ) and 66mg of carrier XC-72 were added into a 150mL o-xylene solution (the volume of ortho-xylene is not limited, as long as the precursor and the carrier are uniformly dispersed), and dispersed evenly by ultrasound. Under the condition of using o-xylene as solvent and reducing agent, heat up and stir to reflux ("reflux" is to ensure that under the boiling point conditions of o-xylene and molybdenum hexacarbonyl, on the one hand, molybdenum hexacarbonyl can reach the cracking condition, on the other hand ortho-xylene acts as a solvent and a reducing agent), the temperature was controlled at 145° C., and the loaded precursor was obtained after 4.5 h of reaction, filtered, w...

Embodiment 2

[0037] Synthesis process see figure 1 ,Specifically:

[0038] 0.2mmol molybdenum hexacarbonyl (Mo(CO) 6 ) with 0.2mmol cobalt acetylacetonate (Co(acac) 2 ) and 66mg of carrier XC-72 were added to a 150mL o-xylene solution, and under the condition of using o-xylene as a solvent and a reducing agent, the temperature was raised and stirred to reflux, and the temperature was controlled at 140°C, 145°C, and 155°C respectively. After 4.5 hours, the loaded precursor was obtained after filtering, washing and drying. The X-ray diffraction pattern of the resulting precursor is shown in Figure 7 As shown, the three curves a, b, and c respectively correspond to reflux temperatures of 155°C, 145°C, and 140°C.

[0039] After grinding the precursors obtained at different reflux temperatures, the supported MoCo-N / carrier alloy was obtained after heat treatment at a low temperature of 550 °C for 3 h with ammonia gas as a reducing atmosphere. Its X-ray diffraction picture is as Figure 8...

Embodiment 3

[0041] Synthesis process see figure 1 ,Specifically:

[0042] 0.2mmol molybdenum hexacarbonyl (Mo(CO) 6 ) with 0.2mmol cobalt acetylacetonate (Co(acac) 2 ) and 66mg of carrier XC-72 were added to a 150mL o-xylene solution, and under the condition of using o-xylene as a solvent and a reducing agent, the temperature was raised and stirred to reflux, the temperature was controlled at 145°C, and the reaction time distribution was 2.5h, 3.5 h, 4.5h, after filtering, washing and drying, the loaded precursor was obtained. Figure 9 X-ray diffraction patterns of the prepared electrocatalyst MoCo / support for PEMFC at different reflux times, where the three curves a, b, and c correspond to the reflux times of 3.5h, 2.5h, and 4.5h, respectively.

[0043] After grinding the precursors obtained under different reflux times, the supported MoCo-N / carrier alloy was obtained after heat treatment at a low temperature of 550 °C for 3 h with ammonia gas as a reducing atmosphere. Its X-ray dif...

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Abstract

The invention discloses a non-noble metal electrocatalyst for a fuel cell and a preparation method thereof. The non-noble metal electrocatalyst is a Co-Mo / carrier alloy or an MoCo-N / carrier alloy. The preparation method of the non-noble metal electrocatalyst comprises the following steps of: (1) dispersing a molybdenum-containing precursor, a cobalt-containing precursor and a carrier into an ortho-xylene solution, reacting for 2.5-4.5 hours at 140 DEG C-155 DEG C in the presence of ortho-xylene serving as a solvent and a reducing agent, filtering, washing, and drying to obtain an MoCo / carrier alloy precursor; and (2) carrying out low-temperature heat treatment on the prepared MoCo / carrier alloy precursor in a reducing atmosphere to obtain a supported MoCo / carrier alloy and / or an MoCo-N / carrier alloy. The used alloy has good electrocatalysis activity, stability and methanol resistant property for oxygen reduction under an alkaline condition; the preparation process is simple and easy; and the non-noble metal electrocatalyst meets the requirements of the cathode electrocatalyst of a proton exchange membrane fuel cell.

Description

[0001] technology field, [0002] The invention belongs to the technical field of fuel cell materials, and in particular relates to a non-precious metal fuel cell oxygen reduction electrocatalyst and a preparation method thereof. Background technique [0003] At present, the commercial electrocatalysts used in the oxygen reduction reaction of proton exchange membrane fuel cells are platinum-based catalysts with high price and poor methanol resistance, which hinders their large-scale application. Therefore, the development of low-cost, good stability, good catalytic activity, and methanol-tolerant cathodic oxygen reduction electrocatalysts is of great significance for the large-scale commercial application of proton exchange membrane fuel cells. [0004] In recent years, great progress has been made in the research of various non-platinum catalysts or non-precious metal catalysts, mainly including N 4 - Macrocycles (Fe-N 4 and Co-N 4 ) (R.Bashyam, P.Zelenay.AClassofNon–Preci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M8/00B01J27/24
CPCY02E60/50
Inventor 安丽夏定国张楠林陈鑫鲁元军
Owner PEKING UNIV
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