Hydrogen production from water using photocatalysts comprising metal oxides and graphene nanoparticles

A photocatalyst, nanoparticle technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, oxygen/ozone/oxide/hydroxide, etc.

Inactive Publication Date: 2016-07-27
SABIC GLOBAL TECH BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Current photocatalysts, such as those utilizing noble metals dispersed on the surface of photoactive materials, suffer from these inefficiencies

Method used

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  • Hydrogen production from water using photocatalysts comprising metal oxides and graphene nanoparticles
  • Hydrogen production from water using photocatalysts comprising metal oxides and graphene nanoparticles
  • Hydrogen production from water using photocatalysts comprising metal oxides and graphene nanoparticles

Examples

Experimental program
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Embodiment 1

[0039] (Materials and Methods for Preparation, Testing and Characterization of Photocatalysts)

[0040] Synthesis of reduced graphene oxide:

[0041] Graphene oxide (GO) was prepared from graphite using a modified Hummers method (Hummers & Offeman, 1958). In a dry 500 mL round bottom flask equipped with a magnetic stirrer, graphite powder (1 g), sodium nitrate (1 g, 11.76 mmol) and sulfuric acid (46 mL) were combined and stirred in an ice bath. To the resulting reaction mixture was slowly added KMnO 4 (6 g, 37.96 mmol). After mixing, the reaction flask was transferred to an oil bath and stirred vigorously at 40 °C for 1 h. To the resulting brown paste was added 80ml of water, and the slurry was stirred for a further 1 h while raising the temperature to 90°C. Finally, 200 mL of water was added, followed by the slow addition of 6 mL of H 2 o 2 (30%), the color of the solution turned from dark brown to brownish yellow. The product was filtered off (while hot), washed wit...

Embodiment 2

[0050] (water splitting reaction)

[0051] The prepared catalyst from Example 1 (20 mg, powder) was charged into a batch reactor. The catalyst was subsequently reduced at 300°C for one hour. The reactor was purged with nitrogen for 30 min. Water (25ml) was then injected into the reactor. The mixture was stirred under UV-irradiation. Gas samples were collected using a syringe at different time intervals and analyzed by using GC-TCD equipped with a PorapakQ column.

[0052] image 3 shows the use of graphene / SrTiO 3 and graphene / CeO 2 Results of UV-excitation experiments of catalysts. In graphene / SrTiO 3 In the case of , hydrogen production appears linear until about 100 min of the reaction, after which the rate of production slows down significantly. Considering the SrTiO used in this work 3 surface area, which is about 3m 2 / g and is approximately equal to 2×10 in this surface 19 O atoms, the total hydrogen concentration was found to be 3×10 per gCatal. 19 molecul...

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Abstract

Disclosed is a photocatalyst, and methods for its use, that includes graphene nanostructures attached to the surface of a photoactive metal oxide semiconductor selected from SrTiO3 or CeO2, wherein the photoactive metal oxide semiconductor is a microstructure or larger.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of U.S. Provisional Application No. 61 / 911,805, filed December 4, 2013. The contents of the cited patent applications are incorporated into this application by reference. [0003] Background of the invention field of invention [0004] The present invention generally relates to photocatalysts that can be used to produce hydrogen from water in photocatalytic reactions. The photocatalyst comprises SrTiO as photoactive material 3 or CeO 2 and graphene (eg, graphene oxide or reduced graphene oxide) as a conductive material. Background of the invention [0005] Hydrogen production from water offers enormous potential benefits to the energy sector, the environment, and the chemical industry (see, for example, Kodama et al., ChemRev. 2007, 107:4048; Connelly et al., Green Chemistry. 2012, 14:260; Fujishima et al., Nature, 1972, 238, 1972; Kudo et al., ChemSocRev 38:253, 2009; Nadeem e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J23/00B01J35/00B01J35/02C01B31/02C01B31/04C01B3/04C02F1/72
CPCB01J21/063B01J23/002B01J35/004B01J35/02C01B3/042C02F1/725C02F2305/10C02F1/32C01B13/0207Y02E60/36B01J7/02B01J19/123B01J21/18B01J23/02B01J23/10B01J35/08B01J2219/1203
Inventor 穆萨·萨利赫阿迈德·哈贾·瓦哈卜希沙姆·伊德里斯桑德罗·加姆巴洛特
Owner SABIC GLOBAL TECH BV
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