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Supported palladium-ultrathin CoNi-LDH (Layered Double Hydroxide) nanosheet composite material as well as preparation method and application thereof

A composite material and supported palladium technology, which is applied in the field of electrocatalysis, can solve the problems of reducing the stability of catalytic active sites, poor stability, and reducing activity, and achieves improved catalytic activity and stability, high stability, and uniform and firm loading. Effect

Inactive Publication Date: 2020-02-04
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
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Problems solved by technology

However, these precious metals still have problems such as high cost, low reserves, and poor stability, which limit their further application. Therefore, it is urgent to study high-activity, high-stability noble metal-based electrocatalysts, reduce the amount of precious metals used on the electrode, and improve their utilization. It is an effective way to reduce its cost; at the same time, compounding noble metals with other nanomaterials is an effective strategy to improve its stability
PdNPs prepared by traditional methods are usually easy to aggregate, which reduces the exposure of its catalytic active sites and the stability during use, and the noble metal Pd is easily poisoned by carbonaceous intermediates (mainly CO) generated during the reaction to reduce the activity. question

Method used

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  • Supported palladium-ultrathin CoNi-LDH (Layered Double Hydroxide) nanosheet composite material as well as preparation method and application thereof
  • Supported palladium-ultrathin CoNi-LDH (Layered Double Hydroxide) nanosheet composite material as well as preparation method and application thereof
  • Supported palladium-ultrathin CoNi-LDH (Layered Double Hydroxide) nanosheet composite material as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0023] (1) Preparation of ultrathin CoNi-LDH nanosheets: First, 48 μmol of Ni(NO 3 ) 2 ·6H 2 O, 48 μmol of Co(NO 3 ) 2 ·6H 2 O and 480 μmol of hexamethylenetetramine were ultrasonically dissolved in a mixed solution of 80 mL deionized water and ethanol (ethanol 60 mL, deionized water 20 mL), and then transferred to a 100 mL stainless steel reaction vessel, sealed Placed in a 95 °C oven for 10 h. The obtained product was collected by centrifugation, washed three times with deionized water, and dried at 60°C to obtain ultrathin cobalt-nickel hydrotalcite nanosheets (expressed as CoNi-LDH-UT);

[0024] (2) Preparation of supported PdNPs ultrathin CoNi-LDH nanosheet composites: 1 mg of the prepared CoNi-LDHs-UT was dispersed in 10 mL of aqueous solution, and 1.0 μmol K 2 PdCl 4 (after adding its concentration is 0.1 mmol L -1 ), stirred continuously at room temperature for 6 h, and the obtained product was collected by centrifugation, washed three times with deionized wate...

Embodiment 2

[0030] (1) Preparation of ultrathin CoNi-LDH nanosheets: First, 32 μmol of Ni(NO 3 ) 2 ·6H 2 O, 64 μmol of Co(NO 3 ) 2 ·6H 2 O and 240 μmol of hexamethylenetetramine were ultrasonically dissolved in a mixed solution of 80 mL of deionized water and ethanol (20 mL of ethanol, 60 mL of deionized water), and then transferred to a 100 mL stainless steel reaction vessel, sealed Placed in an oven at 85 °C for 8 h. The obtained product was collected by centrifugation, washed three times with deionized water, and dried at 50°C to obtain ultrathin cobalt-nickel hydrotalcite nanosheets;

[0031] (2) Preparation of supported PdNPs ultrathin CoNi-LDH nanosheet composites: 1 mg of the prepared CoNi-LDHs-UT was dispersed in 10 mL of aqueous solution, and 0.5 μmol K 2 PdCl 4 (after adding its concentration is 0.05 mmol L -1 ), stirred continuously at room temperature for 4 h, and the obtained product was collected by centrifugation, washed three times with deionized water, and dried a...

Embodiment 3

[0033] (1) Preparation of ultrathin CoNi-LDH nanosheets: First, 64 μmol of Ni(NO 3 ) 2 ·6H 2 O, 32 μmol of Co(NO 3 ) 2 ·6H 2 O and 720 μmol of hexamethylenetetramine were ultrasonically dissolved in a mixed solution of 80 mL of deionized water and ethanol (40 mL of ethanol, 40 mL of deionized water), and then transferred to a 100 mL stainless steel reaction vessel, sealed Placed in an oven at 105 °C for 12 h. The obtained product was collected by centrifugation, washed three times with deionized water, and dried at 70°C to obtain ultrathin cobalt-nickel hydrotalcite nanosheets;

[0034] (2) Preparation of supported PdNPs ultrathin CoNi-LDH nanosheet composites: 1 mg of the prepared CoNi-LDHs-UT was dispersed in 10 mL of aqueous solution, and 3.0 μmol K 2 PdCl 4 (after adding its concentration is 0.3 mmol L -1 ), stirred continuously at room temperature for 8 h, and the obtained product was collected by centrifugation, washed three times with deionized water, and dried ...

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Abstract

The invention discloses a supported palladium-ultrathin CoNi-LDH (Layered Double Hydroxide) nanosheet composite material as well as a preparation method and application thereof. The preparation methodcomprises the following steps: firstly, preparing ultrathin CoNi-LDH nanosheets by using a one-step hydro-alcohol thermal-solvent method, and supporting noble metal Pd nanoparticles by the ultrathinCoNi-LDH nanosheets as a carrier so as to obtain the supported palladium-ultrathin CoNi-LDH nanosheet composite material. The composite material can be applied to an electrocatalytic ethanol oxidationreaction, and has the advantages of high mass activity, good stability, good anti-poisoning ability and the like. The advantages can be attributed to the following aspects: (1), the ultrathin carriercan provide a larger electrochemical activity area, good electrical conductivity, and good CO poisoning resisting ability; and (2), the Ni-based LDH carrier can remove carbonaceous intermediates nearPdNPs sites, the Co element which is highly dispersed in laminates can achieve uniform and solid loading of PdNPs and is beneficial to sufficient utilization of PdNPs, and thus catalytic activity andstability can be synergistically improved.

Description

[0001] The invention belongs to the technical field of electrocatalysis, and in particular relates to a supported palladium-ultrathin CoNi-LDH nanosheet electrocatalyst, a preparation method thereof and an application in electrocatalytic ethanol oxidation reaction. Background technique [0002] Direct ethanol fuel cells (DEFCs) have the advantages of high energy density, no pollution, green and renewable fuel, etc. Research on direct ethanol fuel cells is of strategic significance to alleviate the current energy crisis, environmental pollution and other issues. However, the complete catalytic oxidation of ethanol is a 12-electron transfer process. The breaking of the C-C bond is relatively difficult, and there are many intermediate reactions. The products in the reaction process are easy to poison and deactivate the catalyst. Catalyst is the current development trend. [0003] Among the electrocatalysts used in DEFCs, noble metals such as Pt, Pd, and Ru exhibit high catalytic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J35/10B82Y30/00B82Y40/00H01M4/92
CPCB01J23/892B82Y30/00B82Y40/00H01M4/925B01J35/394B01J35/33Y02E60/50
Inventor 陈旭翟晓颖徐亮杨文胜
Owner BEIJING UNIV OF CHEM TECH
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