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Monolithic non-noble metal alloy hydrazine oxidation catalyst as well as preparation method and application thereof

An oxidation catalyst, non-precious metal technology, used in nanotechnology, structural parts, electrical components, etc. for materials and surface science, can solve the problems of little research, active site shielding, reduced catalytic activity, etc. control, easy availability of raw materials, and the effect of improving mass transfer performance

Pending Publication Date: 2022-07-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few studies on nanostructured transition metal alloy electrocatalysts in the field of hydrazine hydrate fuel cell anode catalysts, and most of them are powder catalysts.
In particular, it needs to be pointed out that when powdery electrocatalyst is used as an electrode, it needs to be coated with a binder, which often causes the active site to be shielded, resulting in the shedding of the active phase of the catalyst during the catalytic reaction. The resulting reduction in catalytic activity (Zhang, J.; Cao, X.; Guo, M.; Wang, H.; Saunders, M.; Xiang, Y.; Jiang, S.P.; Lu, S. Unique Ni crystalline core / Ni phosphide amorphousshell heterostructured electrocatalyst for hydrazine oxidation reaction offuel cells.ACS Appl Mater Interfaces 2019,11,19048-19055.)

Method used

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  • Monolithic non-noble metal alloy hydrazine oxidation catalyst as well as preparation method and application thereof
  • Monolithic non-noble metal alloy hydrazine oxidation catalyst as well as preparation method and application thereof
  • Monolithic non-noble metal alloy hydrazine oxidation catalyst as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0043] Preparation process reference Figure 18 .

[0044] With nickel foam as the carrier, its thickness is 1.60mm, and the areal density is ~650g / m 2 , the aperture is 0.20 ~ 0.80mm. Nickel foam (1×4cm 2 ) were ultrasonically cleaned with ethanol, hydrochloric acid solution (3M) and deionized water for 10 minutes in sequence. The Ni (NO 3 ) 2 ·6H 2 O(0.1M), Fe(NO 3 ) 3 ·9H 2 O (0.2M) and urea (0.2M) were dissolved in 36 mL of deionized water. After continuous stirring for 30 minutes, the mixed solution and a piece of cleaned NF were transferred to a stainless steel autoclave lined with PTFE, treated at a constant temperature of 120 °C for 12 hours, and then cooled to room temperature naturally. Vacuum drying was carried out at 60 °C for 12 hours to obtain a hydrothermal sample NiFe(1:2)-CH / NF; then the hydrothermal sample and 30 mL of ethylene glycol were transferred to a stainless steel lined with PTFE In the autoclave, the temperature was raised to 120 °C for 12...

Embodiment 2

[0062] With carbon cloth (CC, 1×4cm 2 ) as a carrier, after 20 minutes of ultrasonic cleaning with hydrochloric acid (1M), absolute ethanol and deionized water in turn, the carbon cloth was subjected to heat treatment at 500 ° C for 3 hours under an air atmosphere, and then placed in a solution containing transition metal salts, precipitation in the hydrothermal kettle of the agent and solvent. The transition metal salts, organic ligands and mixed organic solvents used in the hydrothermal reaction are: Ni(NO 3 ) 2 ·6H 2 O(0.1M), Fe(NO 3 ) 3 ·9H 2 O (0.2M), hexamethylenetetramine (0.2M) and 36mL of deionized water solution, the hydrothermal reaction conditions are 120 ℃ constant temperature for 12 hours, and then naturally cooled to room temperature, the prepared samples were fully washed and then kept at 60 ℃ Under vacuum drying for 12 hours, the hydrothermal sample NiFe-CH / CC was obtained; then the hydrothermal sample and 30 mL of ethylene glycol were transferred to a s...

Embodiment 3

[0071] Using foam iron (FF) as the carrier, its thickness is 1.80mm, and the areal density is 650g / m 2 , the aperture is 0.20 ~ 0.80mm. Foam iron (1×4cm 2 ) were ultrasonically cleaned with ethanol for 10 minutes, activated with 1M hydrochloric acid solution for 5 minutes, and ultrasonically cleaned with deionized water for 10 minutes. The Ni (NO 3 ) 2 ·6H 2 O(0.1M), Fe(NO 3 ) 3 ·9H 2 O (0.2M) and urea (0.2M) were dissolved in 36 mL of deionized aqueous solution, and after continuous stirring for 30 minutes, the mixed solution and a piece of clean CF were transferred to a Teflon-lined stainless steel autoclave, and the mixture was heated for 120 After being treated at a constant temperature for 12 hours, it was naturally cooled to room temperature. The prepared sample was fully cleaned and then vacuum-dried at room temperature for 12 hours to obtain a hydrothermal sample NiFe-CH / FF; then the hydrothermal sample and 30 mL of ethylene glycol were transferred. In a stainl...

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Abstract

The invention discloses an integral non-noble metal alloy hydrazine oxidation catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: adding a carrier material into a solution containing transition metal salt and a precipitator, and carrying out a hydrothermal reaction at 100-180 DEG C to grow a metal basic carbonate precursor with a nanosheet structure on the surface of the carrier material; and the cleaned and dried metal basic carbonate precursor is subjected to a thermal reduction treatment reaction in a mixed atmosphere composed of reducing gas and inert gas at the temperature of 250-500 DEG C, and the monolithic non-noble metal alloy hydrazine oxidation catalyst is obtained. The preparation method is low in cost, convenient to prepare and easy for mass production. The prepared catalyst has high intrinsic catalytic activity, abundant active sites and good conductivity, can efficiently and stably catalyze the electrochemical oxidation reaction of hydrazine under alkaline conditions, and is superior to the existing DHFC anode electrocatalyst.

Description

technical field [0001] The invention belongs to the field of fuel cell materials, and in particular relates to a monolithic non-precious metal alloy hydrazine oxidation catalyst and a preparation method and application thereof. Background technique [0002] Fossil energy is an important material basis for the creation of modern human civilization, but today, the contradiction between fossil energy structure and human over-exploitation has become increasingly prominent. At the same time, the large-scale exploitation and use of fossil fuels has caused serious environmental pollution A series of global problems such as climate change, fossil energy has increasingly become the source of problems restricting the sustainable development of human society. [0003] The development of new clean energy technologies is the fundamental solution to the global problems in energy and environment in modern society. Fuel cell is a clean and efficient energy conversion technology, which is e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90B82Y30/00B82Y40/00
CPCH01M4/9041H01M4/9083H01M4/9075B82Y30/00B82Y40/00
Inventor 王平张增耀戴文韬唐漂萍
Owner SOUTH CHINA UNIV OF TECH
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