Oxygen reduction La(OH)3/reduced graphene oxide composite catalyst as well as preparation method and application thereof

A graphene composite and composite catalyst technology, applied in the field of electrocatalysis, can solve problems such as low activity and electrical conductivity, and achieve the effects of simple preparation method, high activity, and good physicochemical stability

Active Publication Date: 2016-08-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the defects of low activity and low conductivity of a single rare earth metal compound as an ORR catalyst in the prior art, one of the purposes of the present invention is to provide a novel oxygen reduction La(OH) with excellent comprehensive catalytic performance. 3 / rGO composite catalyst, the catalytic performance is significantly better than La(OH) 3 catalyst

Method used

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  • Oxygen reduction La(OH)3/reduced graphene oxide composite catalyst as well as preparation method and application thereof
  • Oxygen reduction La(OH)3/reduced graphene oxide composite catalyst as well as preparation method and application thereof
  • Oxygen reduction La(OH)3/reduced graphene oxide composite catalyst as well as preparation method and application thereof

Examples

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Embodiment 1

[0029] La(OH) 3 / rGO was prepared in two steps, as follows:

[0030] (1) Preparation of graphene oxide (GO)

[0031] GO was synthesized by the modified Hummers method. Weigh 1g of graphite powder and 5g of NaCl, mix and grind the two for 30min, vacuum filter and dry, then transfer to a 250mL round bottom flask, slowly add 23mL of concentrated sulfuric acid, and stir for 24h. Transfer the round bottom flask to a 35 °C water bath and add 0.5 g NaNO 3 And keep stirring. Wait for NaNO 3 After dissolving, add 3g KMnO very slowly 4 , and then continue to stir for 120min. Slowly add 46mL of deionized water, transfer to a 98°C water bath and heat for 30min, remove and cool to room temperature with constant stirring, add 140mL of deionized water and 10mL of 30% hydrogen peroxide in sequence and stir for 5min. The GO in the suspension was collected by centrifugation. During the centrifugation process (rotating speed is 8000 rpm), wash twice with 5% hydrochloric acid solution, an...

Embodiment 2

[0038] By the method of Example 1, in La(OH) 3 35 mL of GO suspension was added to the preparation of rGO.

[0039] The evaluation method of catalytic performance is the same as in Example 1.

[0040] La(OH) 3 The onset potential of the / rGO composite as an ORR catalyst is -0.18V (vs.Hg / HgO), the half-wave potential is -0.33V (vs.Hg / HgO), and the limiting current density is -3.01mA / cm 2 . In the current meter evaluation, after 6800s of continuous operation, the current density retention rate is about 83%.

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Abstract

The invention discloses an oxygen reduction La(OH)3 / reduced graphene oxide composite catalyst as well as a preparation method and application thereof. The composite catalyst is prepared from a La(OH)3 nanorod loaded on a reduced graphene oxide (rGO) slice layer. The preparation method comprises the following steps: dispersing potassium hydroxide, lanthanum nitrate and graphene oxide into water, performing thermal treatment at first and then hydrothermal reaction, and cooling, centrifugating and freeze-drying a reaction product to obtain the composite catalyst. The preparation method of the composite catalyst is simple, low in cost and favorable for industrial production. When applied to a fuel cell, the prepared composite catalyst is higher in activity and excellent in stability.

Description

technical field [0001] The present invention relates to a kind of oxygen reduction (ORR) catalyst and its preparation and application method, particularly a kind of oxygen reduction La (OH) used for fuel cell 3 The invention relates to a reduced graphene oxide (rGO) composite catalyst and a preparation method thereof, belonging to the technical field of electrocatalysis. technical background [0002] The development of inexpensive and commercially available ORR catalysts to accelerate the sluggish cathode ORR process has been a central issue in the development of fuel cells and other electrochemical energy devices. In the past two decades, although some progress has been made in the research and development of non-precious metal ORR catalysts, there is still a certain distance from practical applications. [0003] In recent years, in addition to transition metal oxides, rare earth metal compounds have also received attention as non-noble metal ORR catalysts, but they also s...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H01M4/90H01M4/88B82Y30/00
CPCB82Y30/00H01M4/88H01M4/9016Y02E60/50
Inventor钱东刘昆闵紫嫣王喜鹏李军
OwnerCENT SOUTH UNIV