Metal-coated oxide nano core-shell structure catalyst and preparation method thereof

A technology of structural catalysts and nano-core shells, applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of low catalyst cost and achieve good dispersion , avoid metal organic compounds, easy to control the effect

Active Publication Date: 2013-03-13
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problems that existing fuel cell catalysts do not have high catalytic activity, stability and low catalyst cost at the same time, and provides a catalyst with a metal-coated oxide nano-core-shell structure and a preparation method thereof

Method used

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  • Metal-coated oxide nano core-shell structure catalyst and preparation method thereof
  • Metal-coated oxide nano core-shell structure catalyst and preparation method thereof

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specific Embodiment approach 1

[0010] Specific Embodiment 1: In this embodiment, a metal-coated oxide nano-core-shell catalyst is a nano-core-shell catalyst whose shell is uniformly coated with metal and whose core is oxide nanoparticles. The shell is uniformly coated with a metal thickness is 1nm-20nm, and the particle size of the oxide nanoparticles is 1nm-200nm.

[0011] The metal-coated oxide nano-core-shell structure catalyst described in this embodiment has a unique oxide core, and its oxide core can change the electronic structure and geometric structure of the outer metal, thereby effectively improving the catalytic activity and stability of the noble metal catalyst. Compared with the commercial carbon-supported palladium (Pd / C) catalyst, the catalytic activity is 1.5~3 times of the commercial carbon-supported palladium (Pd / C) catalyst.

[0012] The core of the metal-coated oxide nano-core-shell structure catalyst described in this embodiment is oxide nanoparticles, and compared with the metal-coate...

specific Embodiment approach 2

[0014] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the oxide nanoparticles are Al 2 o 3 , Ga 2 o 3 , SiO 2 、GeO 2 、TiO 2 , ZrO 2 , V 2 o 5 、Cr 2 o 3 , MnO 2 , Fe 2 o 3 , Fe 3 o 4 、Co 2 o 3 , NiO, CuO, ZnO, Nb 2 o 5 、MoO 3 , RuO 2 、In 2 o 3 , SnO 2 , Sb 2 o 3 , Sb 2 o 5 , Tl 2 o 3 , PbO, Bi 2 o 3 , La 2 o 3 、 Ta 2 o 5 、WO 2 、WO 3 、 Bi 2 o 3 and CeO 2 One of them, or a mixture of two or more of them, or a solid solution of oxides prepared by two or more of them. Others are the same as the first embodiment.

[0015] The oxide solid solution described in this embodiment is prepared according to the following steps: ① First, two or more oxides are dissolved in acid in any proportion, and the mixed solution is obtained after stirring evenly; ② Add Distilled water and polyvinylpyrrolidone (PVP), and use acid to adjust the pH value to 4~6 to obtain the bottom liquid, ③Then add the mixed solut...

specific Embodiment approach 3

[0016] Specific embodiment three: the difference between this embodiment and one of the specific embodiments one or two is: the metal is Pt, Pd, Ru, Os, Rh, Ir, Ag, Au, Re, Cr, Fe, Mn, One or more of Co, Ni, Cu, Zn, In, Sn, and Sb. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention relates to a metal-coated oxide nano core-shell structure catalyst and a preparation method thereof, and in particular relates to a nano fuel cell catalyst with a core-shell structure, and a preparation method of the nano fuel cell catalyst. The invention aims at solving the problems that the conventional fuel cell catalyst is not high in catalytic activity and stability as well as low in cost at the same time. According to the metal-coated oxide nano core-shell structure catalyst, metal uniformly covers a shell, and oxide nano-particles are used as an inner core. The preparation method comprises the steps of: 1, preparing uniform, transparent and stable mixed solution; 2, blending and mixing; 3, adding reducing agent into the mixture; 4, adding extraction agent into the mixture; and 5, carrying out centrifugal washing and drying to obtain the metal-coated oxide nano core-shell structure catalyst. The invention is mainly used for preparing the metal-coated oxide nano core-shell structure fuel cell catalyst.

Description

technical field [0001] The invention relates to a nanometer fuel cell catalyst with a core-shell structure and a preparation method thereof. Background technique [0002] Polymer electrolyte membrane fuel cell is a power generation device that converts chemical energy into electrical energy. It has outstanding features such as high energy conversion rate, environmental friendliness, fast start-up speed at room temperature, high specific power and specific energy, and is recognized as the mainstream in the future. One of the power supply devices, but the high cost caused by the extensive use of noble metal catalysts is the core problem that limits the large-scale application of polymer electrolyte membrane fuel cells. [0003] In recent years, nanomaterials with a core-shell structure have attracted widespread attention due to their special structure. The most common core-shell nanocatalysts currently prepared are metal-coated metal bimetallic core-shell catalysts. The disad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90B01J23/63B01J23/66B01J23/44B01J23/62
CPCY02E60/50
Inventor 杜春雨谭强尹鸽平左朋建程新群马玉林
Owner HARBIN INST OF TECH
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