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Catalyst with dispersed single platinum atoms and preparation method of catalyst

A technology of atomic dispersion and catalyst, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of low utilization rate of platinum, high cost of platinum and platinum preparation, and achieve higher utilization rate, lower preparation cost, and high oxygen reduction performance Effect

Active Publication Date: 2016-04-27
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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Problems solved by technology

[0004] In order to solve the technical problems of high preparation cost and low platinum utilization rate of conventional platinum and platinum-based alloy oxygen reduction catalysts in the prior art, the present invention provides a catalyst with good stability, high oxygen reduction performance and full utilization of each platinum Platinum single-atom dispersed catalyst with atomic catalytic ability and preparation method thereof

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  • Catalyst with dispersed single platinum atoms and preparation method of catalyst
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  • Catalyst with dispersed single platinum atoms and preparation method of catalyst

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preparation example Construction

[0033] The preparation method of the catalyst of platinum single atom dispersion provided by the invention, concrete steps are as follows:

[0034] Step 1. Add the carbon carrier and the platinum compound into the nitric acid solution, then stir and reflux for more than 4 hours in an oil bath above 40°C; the oil bath reflux temperature is preferably 40-100°C, more preferably 80°C; the reflux time is preferably 4~10h, more preferably 6h;

[0035] Step 2. Drying the refluxed liquid sample obtained in step 1 above 35° C. to obtain a solid powder; the drying temperature of the rotary evaporating is preferably 35-65° C., more preferably 60° C.;

[0036] Step 3. Mix the solid powder obtained in step 2 with a non-metallic heteroatom reagent, put it into an agate mortar and grind it for more than 0.1h, then put it into a tube furnace, and process it at 800°C for more than 0.5h to obtain platinum single Atomically dispersed catalyst; the grinding time of the reaction raw material is p...

Embodiment 1

[0039] Add 0.1g of Black Pearl 2000 (hereinafter referred to as BP2000) to 30mL of 6mol / LHNO 3 50mL round-bottomed flask, and then add 130μL of platinum containing 3.102mg·mL to the flask -1 H 2 PtCl solution, the flask was placed in an oil bath with an oil bath temperature of 80°C to reflux for 6h.

[0040] The refluxed suspension was transferred to a 200 mL Erlenmeyer flask, and dried at 60° C. by a rotary evaporator to obtain a platinum-doped carbon black powder. Then put the obtained carbon black powder and 1 g of melamine into an agate mortar and mix them, after grinding for 0.5 h, place the obtained uniformly mixed powder in a single-temperature zone slide rail furnace, and treat at 950° C. for 1 hour at high temperature to obtain Nitrogen-doped platinum single-atom dispersed catalyst powder, after the temperature drops to room temperature, is taken out and set aside. Through XPS test, the ratio of carbon, nitrogen and platinum atoms is 10:1:0.02. Such as figure 1 S...

Embodiment 11、0

[0042] Test in the KOH electrolyte of embodiment 1.1,0.1mol / L:

[0043] 10 μL of the solution was drip-coated on the rotating disk electrode, and after drying at room temperature, a thin-film electrode was obtained; a three-electrode system with an SCE electrode as a reference electrode and a Pt sheet as a counter electrode, in a 0.1mol / In the KOH solution of L, a linear voltammetry test was carried out using a rotating disk electrode, and the scanning speed was 5mV / s. For the results, see figure 2 Curve 21 in . Depend on figure 2 It can be seen that the oxygen reduction onset potential of the catalyst prepared in Example 1 is 8mV, and its half-wave potential is -134mV. Compared with the commercial Pt / C catalyst with a platinum content of 20% in Example 1, the oxygen reduction onset potential and half-wave potential are more positive.

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Abstract

The invention relates to a catalyst with dispersed single platinum atoms and a preparation method of the catalyst, and aims at solving the technical problems that a precious metal oxygen reduction catalyst is high in preparation cost and low in utilization rate of platinum in the prior art. The catalyst with dispersed single platinum atoms is prepared by stirring, refluxing, evaporating, drying and grinding a carbon support, a nonmetal heteroatom reagent and a platinum compound as raw materials, and carrying out high-temperature treatment and interaction in a sliding rail furnace. A test result shows that the platinum element in the catalyst exists in a form of single atoms platinum; the catalytic activity is high; in acid and alkaline systems, the initial oxygen reduction potential and the half-wave potential are equivalent to those of a commercial carbon-supported platinum catalyst with the platinum content of 20%; other metal impurities are not introduced in the preparation process; and the stability is relatively good. The preparation method of the catalyst provided by the invention is relatively low in cost, simple and feasible. The catalyst is suitable for preparation of a fuel cell; the utilization rate of the platinum is greatly improved; the cost of the catalyst is reduced; and the commercialization process of the fuel cell can be promoted.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a platinum single-atom dispersed catalyst and a preparation method thereof. Background technique [0002] Energy is a prerequisite for human progress. With the advent of the energy crisis, the development of new energy has become the most urgent and important strategic demand in the world. At present, the new sustainable energy sources that people are developing and utilizing include solar energy, wind energy, water energy, nuclear energy, fuel cells and so on. Among them, fuel cells, such as proton exchange membrane fuel cells and direct methanol fuel cells, are devices that convert chemical energy into electrical energy through electrochemical reactions. Without the need for combustion, the dye cell directly converts the chemical energy of the fuel into electrical energy through an electrochemical catalytic reaction, and the conversion rate is as high as 60%-80%. Due to it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92
CPCH01M4/926Y02E60/50
Inventor 徐维林刘京宋平阮明波
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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