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Synergistically modified composite electrocatalyst and application thereof in ethanol oxidation

An electrocatalyst and synergistic modification technology, applied in the field of electrocatalytic materials, can solve the problems of ethanol fuel cell technology development limitations, lack of high-activity anode catalyst, low catalytic activity, etc., and achieve excellent catalytic activity, abundant active sites, and process simple effect

Active Publication Date: 2020-04-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the development of ethanol fuel cell technology has been severely limited due to the lack of anode catalysts with high activity, selectivity, and good stability.
[0003] Palladium (Pd) and platinum (Pt) are considered to be the single-metal EOR catalysts with the best performance, but because ethanol will produce carbon-containing intermediates during the electrocatalytic oxidation process and be strongly adsorbed on the surface of the catalyst, causing catalyst deactivation, Result in low catalytic activity and poor durability

Method used

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  • Synergistically modified composite electrocatalyst and application thereof in ethanol oxidation
  • Synergistically modified composite electrocatalyst and application thereof in ethanol oxidation
  • Synergistically modified composite electrocatalyst and application thereof in ethanol oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Pd / Co(CO 3 ) 0.5 Synthesis, characterization and electrocatalytic performance of OH / CFC catalyst:

[0043] (1) Catalyst preparation:

[0044] Using carbon cloth (CFC) as the carrier, its thickness is 0.33mm, and the areal density is ~120g / m 2 . Carbon cloth (1×4cm 2 ) After 10 minutes of ultrasonic cleaning with ethanol, hydrochloric acid solution (1M) and deionized water, together with 40mL containing CoCl 2 ·6H 2 The deionized water solution of O (0.1M), urea (0.5M) and ammonium fluoride (0.2M) was placed in a 50mL hydrothermal kettle, and after constant temperature treatment at 100°C for 10 hours, it was naturally cooled to room temperature to prepare samples After thorough cleaning, vacuum drying was performed at room temperature for 3 hours to obtain a hydrothermal sample; the hydrothermal sample was immersed in 3mL H 2 PdCl 4 (0.001M) in an aqueous solution, kept at a constant temperature of 55°C for 18h, the prepared sample is fully cleaned and vacuum dried at room te...

Embodiment 2

[0054] Pd / (Co,Ni)(CO 3 ) 0.5 Synthesis, characterization and electrocatalytic performance of 0H / CFC catalyst:

[0055] (1) Catalyst preparation: carbon cloth (CC, 1×4cm 2 ) Is the carrier, which is ultrasonically cleaned with hydrochloric acid (1M), absolute ethanol and deionized water for 20 minutes, dried in vacuum at room temperature, and then placed in a hydrothermal kettle containing a transition metal salt solution. The transition metal salt and its concentration used in the hydrothermal reaction process are: CoCl 2 ·6H 2 O(0.04M), NiCl 2 ·6H 2 O (0.02M), urea (0.3M) and ammonium fluoride (0.12M), the hydrothermal reaction condition is 130℃ constant temperature for 15 hours; the hydrothermal sample is immersed in 3mLH 2 PdCl 4 (0.002M) in an aqueous solution, kept at a constant temperature of 65℃ for 16h; 2 It is heated to 160°C in an atmosphere at a heating rate of 10°C / min, and cooled to room temperature after 2 hours of constant temperature treatment to prepare the target ...

Embodiment 3

[0062] Pt / Co(CO 3 ) 0.5 Synthesis and electrocatalytic performance of OH / NF catalyst:

[0063] (1) Catalyst preparation: use foamed nickel (NF, 1×4cm 2 ) Is the carrier, which is ultrasonically cleaned with hydrochloric acid (1M), absolute ethanol and deionized water for 20 minutes, washed and dried with deionized water and absolute ethanol, and then placed in a hydrothermal kettle containing a transition metal salt solution. The transition metal salt and its concentration used in the hydrothermal reaction process are: CoCl 2 ·6H 2 O (0.01M), urea (0.05M), ammonium fluoride (0.03M) hydrothermal reaction conditions are 90 ℃ constant temperature for 5 hours; the hydrothermal sample is immersed in 3mL K 2 PtCl 4 (0.0015M) in the aqueous solution, kept at a constant temperature of 30℃ for 8h; 2 It is heated to 150°C in an atmosphere at a heating rate of 10°C / min, and then cooled to room temperature after 1.5 hours of constant temperature treatment to prepare the target catalyst.

[0064...

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Abstract

The invention belongs to the field of electrocatalytic materials, and discloses a synergistically modified composite electrocatalyst and an application thereof in ethanol oxidation. The composite electrocatalyst is composed of an active noble metal phase and a basic carbonate matrix phase, wherein the active noble metal phase is dispersed and distributed on the surface of the basic carbonate matrix phase with a nanowire structure in the form of fine nanoparticles. The synergistic modified composite electrocatalyst provided by the invention optimizes intrinsic activity, the number of active sites and electrical conductivity at the same time. Based on synthesis of the matrix phase with a nanowire structure, the noble metal oxide phase is deposited on the surface of a nanowire through hydrolysis, and finally, the active metal phase is selectively reduced by regulating and controlling the heat treatment condition, so that the active metal phase is combined with the basic carbonate matrix to construct synergistic catalytic active sites, and the obtained composite electrocatalyst has high intrinsic activity, rich active sites and good electrical conductivity. And the electrochemical oxidation reaction of ethanol can be efficiently and stably catalyzed under an alkaline condition.

Description

Technical field [0001] The invention belongs to the field of electrocatalytic materials, and specifically relates to a synergistically modified composite electrocatalyst and its application in ethanol oxidation. Background technique [0002] Increasing energy demand and global issues such as environmental pollution have greatly stimulated the demand for the development of clean and sustainable energy technologies in human society. Fuel cell is a device that can directly convert the chemical energy of fuel into electric energy. Its large-scale application is of great significance for improving energy efficiency, tackling environmental pollution problems, and realizing green and sustainable development. Compared with traditional hydrogen-oxygen fuel cells, direct ethanol fuel cells have the following technical advantages: the theoretical energy density of ethanol is high (8.0kWh kg -1 ), low price, can be prepared in large-scale batches of agricultural products, and easy to store a...

Claims

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Application Information

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IPC IPC(8): B01J27/236C25B3/02C25B3/23
CPCB01J27/236C25B3/23B01J35/33
Inventor 王平高豪
Owner SOUTH CHINA UNIV OF TECH
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