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Catalytic materials, photoanodes, and photoelectrochemical cells for water electrolysis and other electrochemical techniques

A photoelectrochemical cell and catalytic material technology, applied in the field of compositions for forming photoanode, can solve problems such as low energy conversion efficiency

Inactive Publication Date: 2011-10-19
MASSACHUSETTS INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] While photoelectrochemical devices and photoanodes exist for water electrolysis, these devices are usually constructed of expensive materials and / or operate with low energy conversion efficiencies

Method used

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  • Catalytic materials, photoanodes, and photoelectrochemical cells for water electrolysis and other electrochemical techniques
  • Catalytic materials, photoanodes, and photoelectrochemical cells for water electrolysis and other electrochemical techniques
  • Catalytic materials, photoanodes, and photoelectrochemical cells for water electrolysis and other electrochemical techniques

Examples

Experimental program
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Effect test

Embodiment 1

[0249] The following examples describe non-limiting examples of methods of depositing cobalt-containing catalytic materials (Co-OEC) on photoactive materials such as semiconductor CdS. In this embodiment, the method comprises: providing a solution comprising a metal ionic species and an anionic species, providing a photoactive electrode, and disabling the metal by applying a voltage to the photoactive electrode (e.g., by an external power source or by exposure to a light source). The ionic species and said anionic species form the catalytic material associated with the photoactive electrode.

[0250] Material. Cadmium sulfate, thiourea, ammonium acetate, ammonium hydroxide solution (28% NH 3 ), cobalt nitrate, methylphosphonic acid (Aldrich) and fluorine-doped tin oxide (FTO) coated glass substrates (Solaronix) were used as received.

[0251]CdS film preparation. CdS thin films were prepared on FTO-coated glass substrates by chemical bath deposition technique. 100 mL of de...

Embodiment 2

[0255] The following prophetic examples describe methods of forming Co-OEC functionalized photoanodes and characterization of enhanced light-assisted water oxidation reaction rates.

[0256] Nanostructures growable on conductive FTO-coated glass substrates by atmospheric chemical vapor deposition (CVD) techniques described previously (see for example Kay et al. J.Am.Chem.Soc, 2006, 128, 15714-15721) Iron oxide semiconductor (α-Fe 2 o 3 ). The substrate can then be connected to a potentiostat as a working electrode and immersed in 0.1M KPi (pH 7) and 0.5mM Co(NO 3 ) 2 in the solution. The electrodes can then be biased at 1.1 V vs. Ag / AgCl reference for electrodeposition of Co-OEC catalysts as described in Example 1 and as previously performed for ITO electrodes (see, e.g., Kanan et al., Science, 2008, 321, 1072). The resulting α-Fe 2 o 3 The / Co-OEC electrode can then be used as a photoanode.

[0257] with α-Fe alone 2 o 3 photoanode compared to α-Fe 2 o 3 / Co-OEC ...

Embodiment 3

[0259] The following prophetic examples describe the use of water oxidation, O 2 Non-limiting methods of gas evolution and detection using Co-OEC functionalized photoanodes.

[0260] A Co-OEC functionalized photoanode (eg, prepared according to Example 1 or 2, or otherwise as described here) can be connected to a potentiostat and used as the working electrode for this experiment. The working electrode as well as reference electrode (eg Ag / AgCl) and auxiliary electrode (eg Pt wire) can be immersed in a buffered aqueous solution (eg 1M KPi, pH 7). The entire experiment can then be sealed from the environment (e.g., using a rubber septum in the ground glass joint attached to the electrochemical cell housing) and sealed by using He gas (or other inert gas, such as N 2 , Ar) bubbling purge air. A certain bias voltage (eg 02 preparation. This can be achieved by a photoelectrochemical cell containing a certain fraction of H 2 18 Operation in water of O and m / z=34 ( 18，16 o 2 )...

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Abstract

Catalytic materials, photoanodes, and systems for electrolysis and / or formation of water are provided which can be used for energy storage, particularly in the area of solar energy conversion, and / or production of oxygen and / or hydrogen. Compositions and methods for forming photoanodes and other devices are also provided.

Description

[0001] Statement Regarding Federal Funding for Research or Development [0002] This invention was made with support under Government contract F32GM07782903 awarded by the National Institutes of Health and CHE-0533150 awarded by the National Science Foundation. The government has certain rights in this invention. [0003] related application [0004] This application claims U.S. Provisional Patent Application 61 / 103,898, filed October 8, 2008, Nocera et al., entitled "Catalyst Compositions and Photoanodes for Photosynthesis Replication and Other Photoelectrochemical Techniques," and Nocera et al., filed June 17, 2009 Priority to US Provisional Patent Application 61 / 218,006, entitled "Catalytic Materials, Photoanodes, and Systems for Water Electrolysis and Other Electrochemical Techniques," each of which is incorporated herein by reference. technical field [0005] The present invention relates to photoanodes for water electrolysis that can be used for energy storage. The pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/00H01M14/00B01J35/00
CPCB01J37/0244B01J37/348H01M14/005Y02E60/36Y02P20/133C25B1/55B01J35/39C25B1/04B01J35/00H01M4/00
Inventor 丹尼尔·G·诺切拉马修·W·卡南约格什·苏伦德拉纳特史蒂文·Y·里斯亚瑟·J·埃斯魏因
Owner MASSACHUSETTS INST OF TECH
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