Titanium nitride carrier of catalyst of fuel batter with proton exchange film or titanium nitride and carbon carrier mixing carrier
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A proton exchange membrane and fuel cell technology, applied in the direction of catalyst carrier, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problems of electronic state change on the metal surface and catalyst activity reduction, etc. Achieve high catalytic performance and excellent electrocatalytic performance
Inactive Publication Date: 2009-03-11
NANJING NORMAL UNIVERSITY
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But on the other hand, the interaction between noble metal particles and oxygen-containing groups also leads to changes in the electronic state of the metal surface, which leads to a decrease in catalyst activity.
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Embodiment 1
[0027] Weigh 60 mg of titanium nitride, add 112.68 mL of 0.04504 mol / L PdCl 2 solution, stir to make a homogeneous mixture.
[0028] (2) At 100°C, slowly add excess reducing agent solution (polyoxymethylene) and stir to completely react the metal salt and reducing agent.
[0029] (3), filter and wash until there is no chloride ion in the eluate. After drying, the Pd / TiN catalyst is obtained.
[0030] The titanium nitride accounts for 100% of the total mass of the carrier, the noble metal load is 90% of the total mass of the catalyst, and the reduction temperature is 100°C.
Embodiment 2
[0032] Weigh 1 mg of titanium nitride and 99 mg of activated carbon. Add 0.115mL 0.04504mol / L H 2 PtCl 6 solution, stir to make a homogeneous mixture.
[0033] (2), at 0°C, slowly add excess reducing agent solution (NaBH4 ), stirring to completely react the metal salt with the reducing agent.
[0034] (3), filter and wash until there is no chloride ion in the eluate. After drying, a Pt / TiN-C catalyst is obtained, wherein the loading of Pt metal is 1%.
[0035] The titanium nitride accounts for 1% of the total mass of the carrier, the loading of the noble metal is 1% of the total mass of the catalyst, and the reduction temperature is 0°C.
Embodiment 3
[0037] Weigh 20 mg of carbon nanotubes and 40 mg of titanium nitride. Add 1.32ml 0.0386mol / L H 2 PtCl 6 solution and 1.06ml0.04504mol / L PdCl 2 , and stir to combine evenly.
[0038] (2), at 25°C, slowly add excess reducing agent solution (NaBH 4 ), stirring to completely react the metal salt with the reducing agent.
[0039] (3), filter and wash until there is no chloride ion in the eluate. After drying, a PtPd / TiN-CNTs catalyst is obtained, wherein the loading of Pt metal is 13%, and the loading of Pd metal is 7%.
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Abstract
The invention provides a titanium nitride carrier or a mixed carrier of titanium nitride and charcoal carrier for the catalyst of the proton exchange membrane fuel cell, and is characterized in that the carrier comprises the titanium nitride or the mixture of titanium nitride and charcoal carrier; wherein, the charcoal carrier is one or more of activated carbon, carbon nanotube, carbon molecular sieve and carboform; the titanium nitride accounts for 1-100% of the gross mass of the carrier. More particularly, the carrier is made by the following steps: (1) a precious metal chemical complex is added into a suspension of titanium nitride or a suspension of a mixture of titanium nitride and charcoal carrier; wherein, the amount of the precious metal added into the suspension accounts for 1-90% of the gross mass of the suspension; then the mixture A is obtained after being mixed evenly; (2) excess reducer solution is added into A, so that the metal salt particulates are restored and adsorbed on the carrier; and then B is obtained; (3) after B is filtered, washed and dried, the catalyst loaded on the titanium nitride carrier or the compound carrier of titanium nitride and charcoal is obtained; wherein, the particle size of the precious metal is 1-20nm. Being used in the electro-catalyzed reduction of methanol, methanoic acid and the mixed gas of H2 and CO, the catalyst loaded on the carrier shows very high catalysis performance.
Description
technical field [0001] The invention relates to a catalyst carrier, in particular to a titanium nitride carrier or a mixed carrier of titanium nitride and carbon carrier for a proton exchange membrane fuel cell catalyst. Methanol, formic acid, H 2 The electrochemical oxidation of mixed gas with CO and the electrocatalytic reduction of oxygen exhibit high catalytic performance. Background technique [0002] Due to the advantages of high energy conversion efficiency and low environmental pollution, fuel cells will become the best "clean energy" in the future, and many governments attach great importance to their research. In particular, direct alcohol fuel cells have attracted extensive attention in recent years due to their potential as power sources for electric vehicles and portable mobile power sources. Direct alcohol fuel cell anode catalysts are basically noble metal catalysts. However, because these metals are extremely expensive and resources are limited, batteries ...
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