CN111647908B - Method for improving photoelectric response of iron oxide nanorod array photoelectric anode - Google Patents
Method for improving photoelectric response of iron oxide nanorod array photoelectric anode Download PDFInfo
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- CN111647908B CN111647908B CN202010620059.6A CN202010620059A CN111647908B CN 111647908 B CN111647908 B CN 111647908B CN 202010620059 A CN202010620059 A CN 202010620059A CN 111647908 B CN111647908 B CN 111647908B
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/02—Hydrogen or oxygen
- C25B1/04—Hydrogen or oxygen by electrolysis of water
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
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Abstract
The invention relates to the technical field of preparation of photoelectric functional materials, and discloses a method for improving photoelectric response of a ferric oxide nanorod array photoelectric anode, which is characterized in that the ferric oxide nanorod array photoelectric anode growing on the surface of a conductive substrate under a hydrothermal condition is obliquely leaned against a reaction kettle, the conductive surface on which a ferric oxide nanorod array grows is downward, ethylene glycol is added to two thirds of the reaction kettle and then sealed, the hydrothermal reaction is carried out for 0.1-64 hours, the surface of the substrate is washed by deionized water after natural cooling, and the ethylene glycol-treated ferric oxide nanorod array photoelectric anode is obtained after drying. Compared with the prior art, the method has the advantages that the photoelectric response of the iron oxide nanorod array photoanode can be obviously improved by simply heating the iron oxide nanorod array photoanode in the ethylene glycol solution, the steps are simple, and the operation is easy.
Description
Technical Field
The invention relates to the technical field of preparation of photoelectric functional materials, in particular to a method for improving photoelectric response of a photoelectric anode of an iron oxide nanorod array.
Background
The method for producing hydrogen and oxygen by decomposing water by utilizing semiconductor material through photoelectrocatalysis is an effective method for effectively converting solar energy into chemical energy, and is an ideal way for solving energy crisis and environmental pollution. Among the numerous photoanode materials, Fe2O3The advantages of narrow band gap (2.4 eV), high stability and the like have attracted the wide attention of scientists. However, iron oxide photo-generated charges are easy to recombine, the diffusion distance of photo-generated holes is short, the conductivity is poor, and other factors cause the activity of iron oxide photoelectrocatalysis for water decomposition to be poor, and the photoelectric response is low.
At present, the method for improving the efficiency of the photoelectrocatalysis decomposition of water by ferric oxide and improving the strength of the photoelectricity response mainly comprises the following steps: the surface passivation is carried out, and a cocatalyst is loaded or a heterojunction is constructed to improve the separation efficiency of the photo-generated charges in the ferric oxide, improve the conductivity of the ferric oxide and reduce the recombination of the photo-generated charges in the ferric oxide so as to improve the activity of the photo-electric catalytic decomposition of water. However, the above methods are complicated in operation process.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems in the prior art, the invention provides a method for improving the photoelectric response of the iron oxide nanorod array photoanode, which can obviously improve the photoelectric response of the iron oxide nanorod array photoanode by simply heating the iron oxide nanorod array photoanode in an ethylene glycol solution, and has the advantages of simple steps and easy operation.
The technical scheme is as follows: the invention provides a method for improving photoelectric response of a ferric oxide nanorod array photoelectric anode, which is characterized in that the ferric oxide nanorod array photoelectric anode growing on the surface of a conductive substrate under a hydrothermal condition is obliquely leaned in a reaction kettle, the conductive surface of the conductive substrate on which a ferric oxide nanorod array grows faces downwards, ethylene glycol is added into two thirds of the reaction kettle and then sealed, the hydrothermal reaction is carried out for 0.1-64 hours at the temperature of 100-180 ℃, the surface of the substrate is washed by deionized water after natural cooling, and the ethylene glycol-treated ferric oxide nanorod array photoelectric anode is obtained after drying.
Preferably, the conductive substrate is an FTO conductive substrate.
Has the advantages that: from the test of the mott schottky curve (fig. 2), we find that the conductivity of the iron oxide photo-anode is obviously improved after the treatment of ethylene glycol at 160 ℃, the conductivity is improved, the transmission and separation of charges are accelerated, the recombination efficiency of photo-generated charges is reduced, and thus the photo-anode current of the iron oxide is obviously improved.
The invention can obviously improve the photoelectric response of the iron oxide nanorod array photoanode by simply heating the iron oxide nanorod array photoanode in the glycol solution, and has simple steps and easy operation.
Drawings
Fig. 1 is a current-voltage curve in embodiment 3;
fig. 2 is a mott schottky curve in embodiment 3.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
Embodiment 1:
the embodiment provides a method for improving the photoelectric response of a photoelectric anode of an iron oxide nanorod array, which comprises the following steps:
obliquely leaning an iron oxide nanorod array photoelectric anode growing on the surface of an FTO conductive substrate under a hydrothermal condition (the preparation method of the iron oxide nanorod array photoelectric anode is the same as that in Journal of Materials Chemistry A.2014, 2, 13705-13712) in a reaction kettle, and facing the conductive surface on which the iron oxide nanorod array grows downwards;
adding ethylene glycol into two thirds of the reaction kettle, sealing, and carrying out hydrothermal reaction at 100 ℃ for 64 hours;
and after natural cooling, washing the surface of the substrate by using deionized water, and drying to obtain the ethylene glycol-treated iron oxide nanorod array photoelectric anode.
The iron oxide nanorod array grown on the surface of FTO by a hydrothermal method is obliquely leaned against a polytetrafluoroethylene reaction kettle, the conductive surface of the grown iron oxide nanorod array faces downwards, and then ethylene glycol is added to two thirds of the reaction kettle. The reaction vessel was then sealed.
The reaction kettle is reacted for 64 hours at 100 ℃ and then naturally cooled.
Washing the iron oxide electrode with deionized water, and drying to obtain the ethylene glycol-treated iron oxide nanorod photoanode.
Embodiment 2:
this embodiment is substantially the same as embodiment 1 except that the hydrothermal reaction temperature is 140 ℃ and the hydrothermal reaction time is 48 hours.
Embodiment 3:
this embodiment is substantially the same as embodiment 1 except that the hydrothermal reaction temperature is 160 ℃ and the hydrothermal reaction time is 24 hours.
The current-voltage curve of the iron oxide nanorod photoanode treated with ethylene glycol at 160 ℃ in the embodiment is shown in fig. 1, and thus the current of the iron oxide nanorod array photoanode is obviously improved by the iron oxide nanorod array photoanode treated with ethylene glycol at 160 ℃ for 24 hours.
In this embodiment, the mott schottky curve of the iron oxide nanorod photoanode treated with ethylene glycol at 160 ℃ is shown in fig. 2, which shows that the slope of the linear portion of the mott schottky curve of the iron oxide nanorod treated with ethylene glycol at 160 ℃ is obviously reduced, which indicates that the donor concentration of the photoanode of the iron oxide nanorod array treated with ethylene glycol at 160 ℃ is obviously increased and the conductivity is obviously improved.
Embodiment 4:
this embodiment is substantially the same as embodiment 1 except that the hydrothermal reaction temperature is 180 ℃ and the hydrothermal reaction time is 12 hours.
Embodiment 5:
this embodiment is substantially the same as embodiment 1 except that the temperature of the hydrothermal reaction is 180 ℃ and the time of the hydrothermal reaction is 0.1 hour.
The above embodiments are merely illustrative of the technical concepts and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (2)
1. A method for improving photoelectric response of a ferric oxide nanorod array photoelectric anode is characterized in that the ferric oxide nanorod array photoelectric anode growing on the surface of a conductive substrate under a hydrothermal condition is obliquely leaned in a reaction kettle, the conductive surface of the conductive substrate on which the ferric oxide nanorod array grows faces downwards, ethylene glycol is added into two thirds of the reaction kettle and then sealed, the hydrothermal reaction is carried out for 0.1-64 hours at the temperature of 100 ℃ and 180 ℃, the surface of the substrate is washed by deionized water after natural cooling, and the ethylene glycol-treated ferric oxide nanorod array photoelectric anode is obtained after drying.
2. The method for improving the photoelectric response of the photoanode of the iron oxide nanorod array of claim 1, wherein the conductive substrate is an FTO conductive substrate.
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| WO2007103820A1 (en) * | 2006-03-02 | 2007-09-13 | Altairnano, Inc. | Nanostructured indium-doped iron oxide |
| CN103173794A (en) * | 2013-04-11 | 2013-06-26 | 浙江工业大学 | Method for improving photoelectrical-chemical activity of Ti-Fe2O3 membrane electrode |
| CN104478227B (en) * | 2014-12-05 | 2016-09-14 | 天津理工大学 | The preparation method of α-ferric oxide film that a kind of phosphoric acid hydrogen radical ion is modified |
| CN104815668B (en) * | 2015-04-27 | 2017-04-19 | 浙江工商大学 | Method for preparing Ta and Al co-doped iron oxide photochemical catalysts |
| CN105039938B (en) * | 2015-06-19 | 2018-10-02 | 许昌学院 | The method that a kind of list source presoma prepares the optoelectronic pole of α-ferric oxide film |
| CN105251490B (en) * | 2015-11-06 | 2017-10-13 | 国家电网公司 | α Fe are prepared based on hydro-thermal method2O3The method of nano-tube array |
| CN107313064B (en) * | 2017-06-12 | 2019-02-19 | 太原理工大学 | Metal boron or the α-Fe of phosphide modification2O3The preparation method and application of optical anode material |
| CN107326385B (en) * | 2017-06-16 | 2019-01-22 | 中国科学院化学研究所 | A kind of preparation method of boron doping di-iron trioxide optoelectronic pole |
| US10563312B2 (en) * | 2017-07-11 | 2020-02-18 | University Of South Florida | Photoelectrochemical cells |
| CN108597886B (en) * | 2018-04-28 | 2019-09-10 | 常州工程职业技术学院 | A kind of organic solution and its application for modified oxidized iron light anode |
| CN110424022B (en) * | 2019-06-26 | 2021-05-18 | 武汉科技大学 | Nanorod alpha-iron oxide composite MIL-101 heterojunction photo-anode and preparation method thereof |
| CN110438526A (en) * | 2019-07-17 | 2019-11-12 | 福建师范大学 | A kind of preparation method of nanogold codope iron oxide composite catalyzing electrode, catalysis electrode and electrolysis wetting system |
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