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Co-catalyst for preparing hydrogen through photocatalytic decomposition of formic acid, photocatalytic system, and method for preparing hydrogen by decomposing formic acid

A co-catalyst and photocatalytic technology, applied in the field of photocatalysis, to achieve the effect of low cost

Active Publication Date: 2017-11-03
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing non-noble metal catalysts use ultraviolet light and / or use organic solvents in the reaction process, wherein Cu 2 The hydrogen production efficiency of O decomposing formic acid under visible light irradiation is only 63 μmol H 2 g cat -1 h -1

Method used

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  • Co-catalyst for preparing hydrogen through photocatalytic decomposition of formic acid, photocatalytic system, and method for preparing hydrogen by decomposing formic acid
  • Co-catalyst for preparing hydrogen through photocatalytic decomposition of formic acid, photocatalytic system, and method for preparing hydrogen by decomposing formic acid
  • Co-catalyst for preparing hydrogen through photocatalytic decomposition of formic acid, photocatalytic system, and method for preparing hydrogen by decomposing formic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Heterojunction CoP x Synthesis of @CN:

[0080] Disperse 500mg CN in 100mL water, add 66mg cobalt chloride hexahydrate (CoCl 2 ·6H 2 (0), stirred for 24 hours, then added 2 mL of the newly prepared borane ammonia complex aqueous solution containing 270 mg borane ammonia complex, stirred at room temperature for about 24 hours until the solution was black, and centrifuged to obtain cobalt nanoparticles loaded on CN The solid (Co@CN) was added, and the obtained Co@CN solid was washed three times with hydrated ethanol, and dried in vacuo. The obtained Co@CN was then fully physically ground with 165 mg of sodium hypophosphite to obtain a solid powder mixture. The powder mixture was placed in a porcelain boat and heated at 300°C for 2 hours under the protection of argon, and the obtained solid was hydrated with water. Washed three times with ethanol and dried in vacuum to obtain heterojunction CoP x @CN, where CoP x The mass fraction of is 5wt%.

[0081] figure 1 For t...

Embodiment 2

[0085] Heterojunction NiP z Synthesis of @CN - Method 1:

[0086] Using Ni(OH) 2 @CN Synthesis of NiP as a precursor y @CN. 100mgNi(NO 3 )·6H 2 O was dissolved in 100 mL water containing 50 mg sodium citrate, then 200 mg CN was added, stirred overnight, and excess 0.5 M NaOH solution was added dropwise to form a flocculent precipitate, which was centrifuged and dried to obtain Ni(OH) 2 @CN solid. Add 175 mg of sodium hypophosphite to the obtained solid, grind to obtain a mixed powder, put the powder into a porcelain boat, put it in a tube furnace, and heat it at 300°C for 2 hours under the protection of argon, and then wash the obtained solid with deionized water and ethanol were washed three times and dried in vacuum to obtain the heterojunction NiP z @CN.

Embodiment 3

[0088] Heterojunction NiP z Synthesis of @CN - Method 2:

[0089] Synthesis of NiP Using Ni@CN as Precursor y @CN. Disperse 71 mg of CN in 45 mL of water, ultrasonicate for 30 minutes, stir to form a suspension, then add 110 mg of nickel chloride hexahydrate to the suspension, and after stirring for 40 hours, add 5 mL of newly prepared borane ammonium complex containing 450 mg to the solution The borane ammonium complex aqueous solution was stirred at room temperature for 24 hours. The solution was black and centrifuged to obtain a solid (Ni@CN) loaded with nickel nanoparticles on CN. The obtained Co@CN solid was washed three times with hydrated ethanol, vacuum dry. The obtained Ni@CN and 165 mg of sodium hypophosphite were then fully physically ground to obtain a solid powder mixture. The powder mixture was placed in a porcelain boat and heated at 300°C for 2 hours under the protection of argon, and the obtained solid was hydrated with water. Washed three times with ethan...

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Abstract

The present invention discloses a co-catalyst for preparing hydrogen through photocatalytic decomposition of formic acid, and relates to the field of photocatalysis, wherein the co-catalyst is the mixture comprising one or more than two materials selected from CoPx, FePy, Ni2P and NiPz, x is more than 1 and is less than or equal to 4, y is more than 1 and is less than or equal to 4, z is more than 1 and is less than or equal to 4, and the co-catalyst is used for the preparation of hydrogen through photocatalytic decomposition of formic acid. The invention further discloses a photocatalytic system containing the co-catalyst, wherein the photocatalytic system comprises an organic semiconductor, the co-catalyst, a reaction substrate, and water. According to the present invention, the photocatalytic system completely uses the low-cost elements so as to provide the low cost, the addition of the organic solvent in the reaction is not required, the reaction is performed at the room temperature, and the method has advantages of visible light response, good catalytic system selectivity, high stability, and easy practical application.

Description

technical field [0001] The invention relates to the field of photocatalysis. More specifically, it relates to a cocatalyst for photocatalytic decomposition of formic acid to produce hydrogen, a photocatalytic system, and a method for decomposing formic acid to produce hydrogen. Background technique [0002] Energy shortage and environmental pollution are two major problems facing the world. Photocatalytic hydrogen production is the direct conversion of solar energy into hydrogen energy, and hydrogen (H 2 ) combustion product is water, so photocatalytic hydrogen production can "kill two birds with one stone" to solve energy and environmental problems. However, the efficient production, safe storage and transportation of hydrogen still face a lot of problems. [0003] High energy density formic acid (HCO 2 H, FA) as a potential renewable energy source has received a lot of attention recently. Formic acid has low toxicity and contains 4.4% hydrogen, and CO 2 is H 2 The on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/185B01J27/24C01B3/22C01B32/50
CPCC01B3/22B01J27/185B01J27/24C01B2203/1058C01B2203/1047C01B2203/1052C01B2203/1211C01B2203/1094C01B2203/0277B01J35/39
Inventor 陈勇何平曹爽傅文甫
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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