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A kind of porous material and its preparation and application

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

Active Publication Date: 2018-07-24
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A kind of porous material and its preparation and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: configuration contains the solution of 0.005M NaCl and 0.1M NaOH and it is used as electrolytic solution, and the silver lump electrode that diameter is 5mm is as working electrode, and platinum sheet is counter electrode, and mercury / mercuric oxide electrode is reference electrode, Electrochemical treatment at 1.0V (relative to the reversible hydrogen electrode) for 2h followed by electrochemical reduction in 0.1M NaOH electrolyte at 0.15V (relative to the reversible hydrogen electrode) for 5min to obtain porous silver. 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 0.001mM NaCl and it is used as electrolyte, with silver sheet as working electrode, graphite rod is counter electrode, and 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] Embodiment 3: configure the solution containing 2M NaCl and 0.1M HCl and use it as electrolyte, use silver rod as working electrode, silver sheet as counter electrode, saturated calomel electrode as reference electrode, electrochemical treatment at 5.0V After 360s, copper target X-rays were irradiated for 1h 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, in particular to an oxygen reduction catalyst for a metal-air fuel cell, an oxygen reduction catalyst for a proton exchange membrane fuel cell, an oxygen reduction catalyst for a direct liquid fuel cell, and an alkaline anion Preparation and Application of Oxygen Reduction Catalysts for Exchange Membrane Fuel Cells.

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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Patent Type & Authority Patents(China)
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