CN112886031A - High-performance oxygen reduction catalyst - Google Patents

High-performance oxygen reduction catalyst Download PDF

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CN112886031A
CN112886031A CN202110241420.9A CN202110241420A CN112886031A CN 112886031 A CN112886031 A CN 112886031A CN 202110241420 A CN202110241420 A CN 202110241420A CN 112886031 A CN112886031 A CN 112886031A
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test tube
solution
catalyst
methanol
crystals
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CN112886031B (en
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陈凤英
邸友莹
刘萍
任有良
张国春
赵永利
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Shangluo University
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00Electrodes
    • H01M4/86Inert electrodes with catalytic activity, e.g. for fuel cells
    • H01M4/90Selection of catalytic material
    • H01M4/9016Oxides, hydroxides or oxygenated metallic salts
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B82NANOTECHNOLOGY
    • B82YSPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y30/00Nanotechnology for materials or surface science, e.g. nanocomposites
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B82NANOTECHNOLOGY
    • B82YSPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y40/00Manufacture or treatment of nanostructures
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00Electrodes
    • H01M4/86Inert electrodes with catalytic activity, e.g. for fuel cells
    • H01M4/90Selection of catalytic material
    • H01M4/9075Catalytic material supported on carriers, e.g. powder carriers
    • H01M4/9083Catalytic material supported on carriers, e.g. powder carriers on carbon or graphite
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00Fuel cells; Manufacture thereof
    • H01M8/10Fuel cells with solid electrolytes
    • H01M8/1009Fuel cells with solid electrolytes with one of the reactants being liquid, solid or liquid-charged
    • H01M8/1011Direct alcohol fuel cells [DAFC], e.g. direct methanol fuel cells [DMFC]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30Hydrogen technology
    • Y02E60/50Fuel cells

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Abstract

本发明公开了一种高性能氧还原催化剂,通过以下方法制备所得:准确称量适量五水合硫酸铜用蒸馏水溶解并置于试管底部,再将体积比为1:1的甲醇‑水的混合溶液作缓冲层,用注射器滴加到试管中,然后将2‑羰基丙酸‑4‑硝基苯甲酰腙与1‑甲基咪唑混合,用甲醇溶解后,滴加到试管中,置于溶液上层,最后用保鲜膜密封试管口,静置两周后,在试管壁上溶液的界面处得到深绿色的针状晶体,即为配合物晶体;按照不同比例分别称取适量配合物晶体和碳纳米管,置于乙醇中,超声分散1~2h,即得催化剂墨水。本发明的催化剂的制备简单,原料易得,成本远低与Pt/C。在最佳配比时,实现了氧气分子在电极上的一步4电子还原。

Figure 202110241420

The invention discloses a high-performance oxygen reduction catalyst, which is prepared by the following method: accurately weighing an appropriate amount of copper sulfate pentahydrate, dissolving it in distilled water, placing it at the bottom of a test tube, and then adding a methanol-water mixed solution with a volume ratio of 1:1. Make a buffer layer, drop it into a test tube with a syringe, then mix 2-carbonylpropionic acid-4-nitrobenzoyl hydrazone and 1-methylimidazole, dissolve in methanol, add dropwise to the test tube, and place in the solution In the upper layer, the mouth of the test tube was sealed with plastic wrap, and after standing for two weeks, dark green needle-like crystals were obtained at the interface of the solution on the test tube wall, which were complex crystals; appropriate amounts of complex crystals and The carbon nanotubes were placed in ethanol, and ultrasonically dispersed for 1 to 2 hours to obtain the catalyst ink. The preparation of the catalyst of the invention is simple, the raw materials are easily obtained, and the cost is far lower than that of Pt/C. At the optimal ratio, a one-step 4-electron reduction of oxygen molecules on the electrode is achieved.

Figure 202110241420

Description

High-performance oxygen reduction catalyst
Technical Field
The invention relates to the field of chemical industry, in particular to a high-performance oxygen reduction catalyst.
Background
Energy and environmental problems become important subjects restricting economic development, and countries around the world invest huge resources in developing and researching clean energy. As a new energy source, fuel cells do not produce pollutants during use, and therefore development and research of fuel cells are receiving more and more attention. Direct Methanol Fuel Cells (DMFCs), which are one type of fuel cells, are highly spotlighted because of their advantages, such as convenience, rapidity, and high specific energy. At present, DMFC cathode catalysts are mainly Pt/C, platinum is expensive and limited in resource, and methanol permeating into a cathode discharges on the Pt/C catalyst to reduce catalytic activity, and carbon monoxide generated by discharge poisons the catalyst. Therefore, the research on the oxygen reduction catalyst with higher catalytic activity and better methanol resistance is one of the key technologies to be solved by the direct methanol fuel cell.
With the continued search for fuel cells make internal disorder or usurp, it has become increasingly recognized that catalyst support materials play an important role in the performance of catalysts. The particle size and the morphology of the catalyst carrier have important influence on the performance of the catalyst, and meanwhile, the good catalyst carrier can effectively promote the mass transfer process and reduce the resistance of charge transfer, so that the selection of the good catalyst carrier is beneficial to exerting the performance of the catalyst, and the catalytic activity of the catalyst is effectively improved under the synergistic effect of the good catalyst carrier and the good catalyst carrier.
Disclosure of Invention
In order to solve the problems, the invention provides a high-performance oxygen reduction catalyst, which takes carbon nano tubes as catalyst carriers to greatly improve the electronic performance of the catalyst.
In order to achieve the purpose, the invention adopts the technical scheme that:
a high performance oxygen reduction catalyst is prepared by the following method:
s1, accurately weighing 0.2 mmol of copper sulfate pentahydrate (CuSO)4⋅5H2O) dissolving with 5mL of distilled water, placing the solution at the bottom of a test tube, taking 5mL of a methanol-water mixed solution with the volume ratio of 1:1 as a buffer layer, dropwise adding the buffer layer into the test tube by using an injector, mixing about 0.2 mmol of 2-oxo-propionic acid-4-nitrobenzoylhydrazone with about 0.8 mmol of 1-methylimidazole, dissolving with 5mL of a methanol solution, carefully dropwise adding the solution into the test tube, placing the test tube on the upper layer of the solution, finally sealing the opening of the test tube by using a preservative film, standing for two weeks, and obtaining dark green needle crystals, namely complex crystals, at the interface of solution layering on the wall of the test tube;
s2, weighing a proper amount of complex crystals and carbon nanotubes according to different proportions, respectively, placing the complex crystals and the carbon nanotubes in 2-5 mL of absolute ethyl alcohol, and performing ultrasonic dispersion for 1-2 hours to obtain the catalyst ink.
Further, the mass ratio of the complex crystal to the carbon nanotube is 0:5, 1:4, 2:3, 3:2, 4:1 or 5: 0.
The invention has the following beneficial effects:
the catalyst of the invention has simple preparation, easily obtained raw materials and low cost compared with Pt/C. In the optimal proportioning, the one-step 4-electron reduction of oxygen molecules on the electrode is realized. In the presence of methanol, no oxidation/reduction peak of methanol occurs, and the methanol resistance is better.
Drawings
FIG. 1 shows the crystal structure of a complex in an example of the present invention
FIG. 2 is a unit cell stacking diagram of a complex in an example of the present invention.
Fig. 3 is a CV curve of catalyst modified electrodes of different proportions in an oxygen saturated alkaline solution.
FIG. 4 is a linear sweep voltammogram of a rotating disk electrode modified with optimally matched catalyst in alkaline solution.
FIG. 5 shows that the optimum ratio of catalyst modified rotating disk electrode to oxygen reduction reaction is-0.8Vj –1Andω –1/2a relationship curve.
FIG. 6 shows the optimum ratio of catalyst in modified glassy carbon electrode saturated with oxygenAlkaline solution and alkaline solution + 0.5 mol. L-1 CH3Cyclic voltammogram in OH solution (solid line represents basic solution, dashed line represents basic solution + 0.5 mol. L)-1 CH3OH solution).
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
Examples
Dissolving 2-oxo-propionic acid-4-nitrobenzoylhydrazone and 1-methylimidazole in absolute ethyl alcohol according to a certain mass ratio (0:5, 1:4, 2:3, 3:2, 4:1 and 5:0), dissolving copper sulfate in distilled water, preparing a complex monocrystal by adopting a test tube diffusion method, and specifically, accurately weighing 0.2 mmol of copper sulfate pentahydrate (CuSO)4⋅5H2O) dissolving with 5mL of distilled water, placing the solution at the bottom of a test tube, taking 5mL of a methanol-water mixed solution with the volume ratio of 1:1 as a buffer layer, dropwise adding the buffer layer into the test tube by using an injector, mixing about 0.2 mmol of 2-oxo-propionic acid-4-nitrobenzoylhydrazone with about 0.8 mmol of 1-methylimidazole, dissolving with 5mL of a methanol solution, carefully dropwise adding the solution into the test tube, placing the test tube on the upper layer of the solution, finally sealing the opening of the test tube by using a preservative film, standing for two weeks, and obtaining dark green needle crystals, namely complex crystals, at the interface of solution layering on the wall of the test tube; the single crystal structure, the crystallographic data and the partial bond length angle data of the complex are shown in tables 1 and 2, and the structure and unit cell stacking diagram of the complex are shown in fig. 1 and 2.
TABLE 1 crystallographic data for the complexes
Figure 377850DEST_PATH_IMAGE002
TABLE 2 bond lengths and bond angles of the complexes
Figure 826149DEST_PATH_IMAGE004
Preparation of the catalyst: respectively weighing complex crystals and carbon nanotubes with different masses according to the proportion of 0:5, 1:4, 2:3, 3:2, 4:1 and 5:0, placing the complex crystals and the carbon nanotubes into 2-5 mL of ethanol, and ultrasonically dispersing for 1-2 hours to prepare catalyst ink with different proportions. And (3) transferring 5-15 mu L of catalyst ink by using a liquid transfer gun, dropwise adding the catalyst ink to the surface of the glassy carbon electrode in batches, and airing for later use.
And (3) testing the catalytic performance: the catalytic oxygen reduction performance of the catalyst is tested by adopting a three-electrode system and an alkaline electrolyte solution, before the test, oxygen is introduced into the electrolyte solution until the electrolyte solution is saturated, and then the catalytic oxygen reduction performance of the catalyst is tested.
Determining the optimal proportion by cyclic voltammetry: according to the magnitude of the cyclic voltammetry current, the optimal ratio of the complex to the carbon nanotube is 2:3 as seen from fig. 3.
Electron transfer number for the best matched catalyst to catalyze the oxygen reduction reaction (fig. 5): through calculation, the electron transfer number of the optimal proportioning catalyst for catalyzing the oxygen reduction reaction is 3.7, and the one-step 4-electron reduction of oxygen molecules can be realized.
Methanol resistance: as can be seen from FIG. 6, in the presence of methanol, the oxidation peak of methanol does not appear in the cyclic voltammetry curve of the catalyst, but the peak current is slightly reduced, and the peak potential of the oxygen reduction reaction is not negatively shifted, which indicates that the catalyst sample has better methanol poisoning resistance.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.

Claims (2)

1. A high performance oxygen reduction catalyst characterized by: the preparation method comprises the following steps:
s1, accurately weighing 0.2 mmol of copper sulfate pentahydrate, dissolving the copper sulfate pentahydrate in 5mL of distilled water, placing the solution at the bottom of a test tube, taking 5mL of a methanol-water mixed solution with a volume ratio of 1:1 as a buffer layer, dropwise adding the buffer layer into the test tube by using an injector, mixing 0.2 mmol of 2-oxo-propionic acid-4-nitrobenzoylhydrazone with 0.8 mmol of 1-methylimidazole, dissolving the buffer layer in 5mL of a methanol solution, dropwise adding the solution into the test tube, placing the test tube on the upper layer of the solution, sealing the opening of the test tube by using a preservative film, and standing for two weeks to obtain dark green needle-like crystals, namely complex crystals, at the interface of solution layering on the wall of the test;
s2, weighing a proper amount of complex crystals and carbon nanotubes according to different proportions, respectively, placing the complex crystals and the carbon nanotubes in 2-5 mL of absolute ethyl alcohol, and performing ultrasonic dispersion for 1-2 hours to obtain the catalyst ink.
2. A high performance oxygen reduction catalyst according to claim 1, wherein: the mass ratio of the complex crystal to the carbon nanotube is 0:5, 1:4, 2:3, 3:2, 4:1 or 5: 0.
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