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Porous material and its preparation method and use

A porous material and hierarchical porous technology, applied in the field of porous materials, can solve the problems of limited application, high cost, large surface area, etc., and achieve the effects of high utilization rate of precious metals, improved catalytic activity, and large surface area.

Active Publication Date: 2016-06-22
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the core generally uses noble metals such as Pd and Au and their alloys, and the cost is relatively high.
Compared with precious metals such as Pt, Pd, and Au, Ag has the advantages of large reserves and low price, but there are few studies on it
Due to its large surface area and good mass transfer, porous silver has shown good application prospects in the field of catalysis. Because silver is not resistant to acid corrosion, its application in acidic environments is limited. Pt, Pd and other noble metals are used as shell materials. The preparation of porous core-shell catalysts with porous silver as the core material can be used in acidic environments, but research in this area has not been reported yet

Method used

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  • Porous material and its preparation method and use

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: configuration contains the solution of 0.005MNaCl and 0.1MNaOH and it is used as electrolytic solution, and diameter is the silver lump electrode of 5mm as working electrode, and platinum sheet is counter electrode, and mercury / mercuric oxide electrode is reference electrode, at 1.0 Porous silver was obtained by electrochemical treatment at V (relative to the reversible hydrogen electrode) for 2 h, and then electrochemically reduced in 0.1M NaOH electrolyte at 0.15 V (relative to the reversible hydrogen electrode) for 5 min. The obtained porous silver was immersed in an electrolyte solution containing 50 mM chloroplatinic acid for 10 min. Samples were obtained after washing.

Embodiment 2

[0027] Embodiment 2: configuration contains the solution of 0.001mMNaCl and it is used as electrolyte, with silver flake as working electrode, graphite rod is counter electrode, silver / silver chloride electrode is reference electrode, at 1.5V (relative to reversible hydrogen electrode ) under electrochemical treatment for 100 h, and then irradiated under strong light of 200,000 lux for 1 h to obtain porous silver. The obtained porous silver was underpotentially deposited in a solution of 50mM copper nitrate and 50mM nitric acid at 390mV (relative to the reversible hydrogen electrode) for 5min, and then immersed in an electrolyte solution containing 50mM chloroplatinic acid for 10min. Samples were obtained after washing.

Embodiment 3

[0028] Example 3: Configure a solution containing 2MNaCl and 0.1M HCl and use it as an electrolyte, use a silver rod as a working electrode, a silver sheet as a counter electrode, and a saturated calomel electrode as a reference electrode. After electrochemical treatment at 5.0V for 360s The copper target was irradiated with X-rays for 1 h to obtain porous silver. The obtained porous silver was immersed in an electrolyte solution containing 50 mM chloropalladic acid for 10 min. Samples were obtained after washing.

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Abstract

The invention relates to an oxygen reduction catalyst with a core-shell structure and concretely relates to a preparation method and use of a metal-air fuel cell oxygen reduction catalyst, a proton exchange membrane fuel cell oxygen reduction catalyst, a direct liquid fuel cell oxygen reduction catalyst and an alkaline anion-exchange membrane fuel cell oxygen reduction catalyst.

Description

technical field [0001] The invention belongs to the field of preparation of nanometer materials, and in particular relates to a porous material with a noble metal outer layer covering a silver inner core. Background technique [0002] With the increasing consumption of fuels such as coal, oil and natural gas and the depletion of energy resources, it is urgent to find energy technologies that are environmentally friendly and sustainable. Because of its high energy conversion efficiency, no pollution, no noise and other advantages, fuel cells have become a research hotspot all over the world. [0003] At present, the most effective catalysts for fuel cell cathode ORR catalysts are still Pt and its alloy catalysts. However, the limited reserves and high price of Pt have become one of the obstacles to the commercialization of fuel cells. How to increase the utilization of catalysts without reducing their activity has become a research hotspot recently. [0004] The Adzic rese...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88H01M4/90
CPCY02E60/50
Inventor 孙公权袁丽只姜鲁华
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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