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Metastable nanocrystal and preparation method and application thereof

A nanocrystalline, stable technology, applied in the nano field, can solve the problems of high catalyst cost, difficult to use on a large scale, slow kinetics, etc., and achieve the effects of low reaction temperature, short time and simple process.

Inactive Publication Date: 2017-05-10
NANJING XIAOZHUANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] With the world's increasing energy needs and environmental problems, renewable H 2 -O 2 Fuel cells play an important role in new energy systems, however, the cathode O 2 The slow kinetics of oxygen reduction reaction (ORR) is the main bottleneck affecting its performance and application
Although Pt-based catalysts can catalyze ORR well, the high cost of catalysts and the difficulty of large-scale use due to the limited reserves of Pt on the earth greatly limit the use of H 2 -O 2 Large-scale commercialization of fuel cells

Method used

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  • Metastable nanocrystal and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] At room temperature, weigh 0.5mmol Pd(NO 3 ) 2 ·2H 2 O, 0.25mmol Fe(acac) 2 Or Co(acac) 2 Or Cu(acac) 2 Or Mn(ac) 2 Add to a dry three-necked round-bottom flask with a capacity of 250mL, then measure 8mL OLA and 10mL ODE with a graduated cylinder and add them to the three-necked round-bottom flask, transfer the three-necked round-bottom flask to the sand bath, and program temperature control Increase the temperature to 280°C at a rate of 7°C / min and keep it at 280°C for 20 minutes, then add 0.25mmol AgNO 3 The solution was kept for 40 minutes until the reaction was over. After the reactor is naturally cooled to room temperature, an appropriate amount of n-heptane and absolute ethanol are added for dispersion, and the solid is separated by centrifugation. The solid was washed to obtain a black product, which was dried overnight in a vacuum drying oven for analysis and characterization.

[0025] Using EDS, XRD, TEM and HREM tests to analyze the products, the results are as f...

Embodiment 2

[0027] In the three-electrode system, the electrochemical properties of the sample are tested by cyclic voltammetry and polarization curve method. The specific process is as follows:

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Abstract

The invention belongs to the field of nanometers, and particularly discloses metastable nanocrystal and a preparation method and application thereof. The metastable nanocrystal disclosed by the invention is Pd2MAg nanocrystal, wherein M is Fe, Co, Cu or Mn. The metastable nanocrystal has excellent ORR performance, and the ORR in a fuel cell can be efficiently catalyzed. Meanwhile, the preparation method is simple, the reaction temperature is low, the reaction time is short and the preparation method is suitable for mass production, and meets the industrial production requirements.

Description

Technical field [0001] The invention discloses a metastable nanocrystal, a preparation method and application thereof, and belongs to the field of nanometers. Background technique [0002] With the increasing world energy demand and environmental problems, renewable H 2 -O 2 Fuel cells play an important role in the new energy system, but the cathode O 2 The slow kinetics of oxygen reduction reaction (ORR) is the main bottleneck affecting its performance and application. Although Pt-based catalysts can catalyze ORR well, due to the limited reserves of Pt on the earth, the catalyst cost is very high and it is difficult to use on a large scale, which greatly limits H 2 -O 2 Large-scale commercialization of fuel cells. Therefore, it is very important to design and prepare low-cost, high-performance, and long-life electrocatalysts to improve ORR kinetics. Literature studies have shown that Pd-based nanocrystals are considered to be the most effective catalyst that can replace Pt to c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90H01M4/92B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/88H01M4/9058H01M4/921Y02E60/50
Inventor 华春陈昌云刘苏莉刘钦普
Owner NANJING XIAOZHUANG UNIV
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