Non-noble metal hydrazine oxidation catalyst based on collaborative modification and preparation method thereof

A technology for oxidation catalysts and non-precious metals, applied in nanotechnology for materials and surface science, electrical components, battery electrodes, etc., can solve the problems that the catalytic performance of catalysts cannot meet the requirements of practical applications, and achieve high intrinsic catalytic activity and good Conductivity, effect of improving mass transfer performance

Active Publication Date: 2019-12-31
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Overall, encouraging progress has been made in the development of anode electrocatalysts for direct hydrazine fuel cells, but the catalytic performance of existing catalysts is still far from meeting the requirements for practical applications.
Here, it should be noted that existing methods for screening anode electrocatalysts for direct hydrazine fuel cells are largely empirical due to the lack of in-depth understanding of the electrocatalytic process.

Method used

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  • Non-noble metal hydrazine oxidation catalyst based on collaborative modification and preparation method thereof
  • Non-noble metal hydrazine oxidation catalyst based on collaborative modification and preparation method thereof
  • Non-noble metal hydrazine oxidation catalyst based on collaborative modification and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] With nickel foam as the carrier, its thickness is 1.60mm, and its surface 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 (1M) and deionized water for 10 minutes, together with 36mL containing Ni(NO 3 ) 2 ·6H 2 The deionized aqueous solution of O (0.015M) and HMT (0.03M) was placed in a hydrothermal kettle with a volume of 50mL, and after being treated at 100°C for 10 hours, it was naturally cooled to room temperature, and the prepared sample was fully cleaned and then vacuumed at room temperature. Dry for 6 hours to obtain the hydrothermal sample Ni(OH) 2 / NF; hydrothermal sample in NH 3 / Ar atmosphere heated to 380 ° C, the heating rate of 5 ° C / min, after 2 hours of constant temperature heat treatment and then cooled to room temperature, the target catalyst Ni 3 N / Ni / NF.

[0041] The phase / structural characterization of the catalyst obtained in this embodiment: ...

Embodiment 2

[0051] With carbon cloth (CC, 1×4cm 2 ) as the carrier, after ultrasonic cleaning with hydrochloric acid (1M), absolute ethanol and deionized water for 20 minutes each, the carbon cloth was kept in concentrated nitric acid (0.5M) at 90°C for 4 hours, and deionized water and deionized ethanol After washing and drying, put it into a hydrothermal kettle equipped with a transition metal salt solution and a precipitating agent. The transition metal salts, precipitants and their concentrations used in the hydrothermal reaction process are: NiCl 2 ·6H 2 O (0.05M), HMT (0.1M), hydrothermal reaction condition is 140 ℃ constant temperature for 16 hours; hydrothermal state sample in NH 3 / Ar atmosphere was heated to 450° C., the heating rate was 10° C. / min, and after 9 hours of constant temperature heat treatment, it was cooled to room temperature to obtain the target catalyst.

[0052] The phase / structural characterization of the catalyst obtained in this embodiment:

[0053] (1) Th...

Embodiment 3

[0059] With nickel foam as the carrier, its thickness is 1.60mm, and its surface 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 (1M) and deionized water for 10 minutes, together with 36 mL of Co(NO 3 ) 2 ·6H 2 The deionized aqueous solution of O (0.1M) and HMT (0.2M) was placed in a hydrothermal kettle with a volume of 50mL, and after being treated at 150°C for 5 hours, it was naturally cooled to room temperature. The prepared sample was fully cleaned and then vacuumed at room temperature. Dry for 6 hours to obtain the hydrothermal sample Co(OH) 2 / NF; hydrothermal sample in NH 3 / Ar atmosphere heated to 400 ° C, heating rate 5 ° C / min, after 2 hours of constant temperature heat treatment and then cooled to room temperature, the target catalyst Co 3 N / Co / NF.

[0060] Catalyst Co obtained in this embodiment 3 Electrocatalytic performance test of N / Co / NF:

[0061] The obt...

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Abstract

The invention belongs to the fuel cell material field, and discloses a non-noble metal hydrazine oxidation catalyst based on collaborative modification and a preparation method thereof. The catalyst comprises metal nitride active phases and metal matrix phases, wherein the metal nitride active phases are dispersed and distributed on surfaces of the metal matrix phases in a fine nanoparticle form.A carrier material is added into an aqueous solution containing transition metal salt and a precipitator, hydrothermal reaction at 80-180 DEG C is performed to obtain a nano-structure catalyst precursor, and heat treatment reaction is performed in a mixed atmosphere of an ammonia gas and an inert gas at 300-450 DEG C to obtain the non-noble metal hydrazine oxidation catalyst based on the collaborative modification. The preparation method is low in raw material cost, convenient to prepare and easy for mass production. The prepared catalyst has high intrinsic catalytic activity, rich active sites and good conductivity, and can efficiently and stably catalyze an electrochemical oxidation reaction of hydrazine under an alkaline condition.

Description

technical field [0001] The invention belongs to the field of fuel cell materials, in particular to a non-noble metal hydrazine oxidation catalyst based on synergistic modification and a preparation method thereof. Background technique [0002] Global issues such as increasing energy demand and environmental pollution have greatly stimulated the development of clean and sustainable energy technologies. Fuel cells enable efficient, reliable and environmentally friendly conversion from chemical energy to electrical energy, thereby offering a promising alternative to conventional technologies such as the internal combustion engine for distributed power generation. Fuel cells have a wide operating temperature range and various performance specifications, mainly depending on the type of fuel. When looking for viable fuel cells for vehicular or portable applications, direct hydrazine fuel cells have attracted considerable attention due to their many favorable properties. Hydrazin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/88B82Y30/00B82Y40/00
CPCH01M4/90H01M4/9041H01M4/88B82Y30/00B82Y40/00Y02E60/50
Inventor 王平林曦温禾
Owner SOUTH CHINA UNIV OF TECH
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