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Pt-based octahedral nanocrystal cathode catalyst used for vehicle-mounted fuel cell and preparation method for cathode catalyst

A cathode catalyst and fuel cell technology, applied in fuel cells, power system fuel cells, nanotechnology for materials and surface science, etc., can solve the problem of poor uniformity of nanocrystal morphology, easy agglomeration, uneven dispersion of nanocrystals, etc. problems, to achieve the effect of excellent electrochemical performance, good dispersion and uniform catalyst structure

Inactive Publication Date: 2017-09-08
上海亮仓能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First, the uniformity of the morphology of the prepared nanocrystals is poor. The crystals prepared by some methods cannot completely form an octahedron, and some crystals will form a truncated octahedron, or contain cubes, stars or other irregular shapes; Second, the dispersion of nanocrystals on the carrier is not uniform and easy to agglomerate; third, in order to effectively reduce the cost, the electrocatalytic activity of the above catalysts, especially the mass specific activity, still needs to be further improved

Method used

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  • Pt-based octahedral nanocrystal cathode catalyst used for vehicle-mounted fuel cell and preparation method for cathode catalyst
  • Pt-based octahedral nanocrystal cathode catalyst used for vehicle-mounted fuel cell and preparation method for cathode catalyst
  • Pt-based octahedral nanocrystal cathode catalyst used for vehicle-mounted fuel cell and preparation method for cathode catalyst

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Embodiment 1

[0036] Using CTAB as a Pt-based octahedral nanocrystal cathode catalyst prepared by a structure control agent, its preparation method can be found in figure 1 shown.

[0037] Pt(acac) 2 , Ni(acac) 2 , CTAB was dissolved in a certain volume of DMF; another certain volume of DMF was taken (to make the total volume of DMF taken twice be 70mL, and to make Pt(acac) 2 、Ni(acac) 2 , CTAB concentrations are 4mM, 10mM, 4mM respectively), add 0.081g of Vulcan XC-72R carbon carrier, ultrasonic 30min to make it uniformly dispersed; mix the above separately dispersed solutions, ultrasonically disperse for 30min. Pour the above solution into a 100mL stainless steel autoclave lined with polytetrafluoroethylene, pressurize and seal it, place it in an oven, heat it from room temperature to 160°C, and react for 12h. After the reaction was complete, the autoclave was cooled to ambient temperature. The colloidal solution after the reaction was suction-filtered through a sand core funnel to o...

Embodiment 2

[0040] Pt-Based Octahedral Nanocrystalline Cathodic Catalysts Prepared Using Benzoic Acid as Structure Controlling Agent

[0041] Pt(acac) 2 , Ni(acac) 2 , benzoic acid is dissolved in a certain volume of DMF; another certain volume of DMF is taken (to make the total volume of DMF measured twice is 70mL, and to make Pt(acac) 2 、Ni(acac) 2 , benzoic acid concentrations are 2mM, 1.5mM, 5mM), add 0.14g of Vulcan XC-72R carbon carrier, ultrasonic 30min to make it uniformly dispersed; mix the above separately dispersed solutions, ultrasonically disperse for 30min. Pour the above solution into a 100mL stainless steel autoclave lined with polytetrafluoroethylene, pressurize and seal it, place it in an oven, heat it from room temperature to 160°C, and react for 12h. After the reaction was complete, the autoclave was cooled to ambient temperature. The colloidal solution after the reaction was suction-filtered through a sand core funnel to obtain a solid product, and then washed wit...

Embodiment 3

[0044] Pt-based octahedral nanocrystalline cathode catalysts prepared with CTAB as structure control agent

[0045] Pt(acac) 2 、Ni(acac) 2 , CTAB was dissolved in a certain volume of DMF, and another certain volume of DMF was taken (to make the total volume of DMF measured twice to be 70mL, and to make Pt(acac) 2 、Ni(acac) 2 , CTAB concentrations are 4mM, 10mM, 4mM), add 0.2g of Vulcan XC-72R carbon carrier, ultrasonic 30min to make it uniformly dispersed; mix the above separately dispersed solutions, ultrasonically disperse for 30min. Pour the above solution into a 100mL stainless steel autoclave lined with polytetrafluoroethylene, pressurize and seal it, place it in an oven, heat it from room temperature to 150°C, and react for 14h. After the reaction was complete, the autoclave was cooled to ambient temperature. The colloidal solution after the reaction was suction-filtered through a sand core funnel to obtain a solid product, then washed with ethanol and high-purity wa...

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Abstract

The invention relates to a Pt-based octahedral nanocrystal cathode catalyst used for a vehicle-mounted fuel cell and a preparation method for the cathode catalyst. According to the process, a one-step organosol method is adopted; and by adding the proper structural control agent CTAB or benzoic acid and the like, the octahedral-shaped PtM / C nanocrystal catalyst (PtM / C NCs) is prepared. Compared with the prior art, the catalyst provided by the invention takes the PtM(111) crystal surface with relatively high activity as a granular surface; compared with a commercial Pt / C catalyst, the catalytic activity of the cathode catalyst provided by the invention on oxygen is highly improved, and the cathode catalyst has certain advantages on cost and actual applications; and meanwhile, the cathode catalyst has simple preparation method, uniform catalyst structure, relatively high dispersity, excellent electrochemical performance and the like.

Description

technical field [0001] The invention relates to the technical field of electrocatalysis and energy conversion, in particular to a Pt-based octahedral nanocrystal cathode catalyst for a vehicle-mounted fuel cell and a preparation method thereof. Background technique [0002] A fuel cell is a chemical battery that uses the energy released when a substance undergoes a chemical reaction to directly convert it into electrical energy. It is a power generation device that can continuously obtain electricity by continuously supplying fuel. Among all kinds of fuel cells, proton exchange membrane fuel cells (PEMFC) have the advantages of high energy conversion efficiency, environmental friendliness, high reliability, and low-temperature operation. All have broad application prospects, especially in the field of automotive power. [0003] PEMFC consists of four parts: proton exchange membrane, catalytic layer, gas diffusion layer and bipolar plate. As an important part of fuel cells, ...

Claims

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Application Information

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IPC IPC(8): H01M4/92H01M8/1018B82Y30/00
CPCB82Y30/00H01M4/921H01M4/926H01M8/1018H01M2250/20Y02E60/50
Inventor 谷军楚天阔李雨龙
Owner 上海亮仓能源科技有限公司
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