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Method for Improving Photoelectric Response of Iron Oxide Nanorod Array Photoanodes
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A technology of iron oxide nanometer and photoanode, which is applied in the direction of electrodes, electrolysis components, electrolysis process, etc., can solve the problems of complex operation process, etc., and achieve the effect of improving photoelectric response, simple steps and easy operation
Active Publication Date: 2021-03-16
HUAIYIN INSTITUTE OF TECHNOLOGY
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Embodiment approach 1
[0013] This embodiment improves a method for improving the photoelectric response of the iron oxide nanorod array photoanode, including the following steps:
[0014] The iron oxide nanorod array photoanode grown on the surface of the FTO conductive substrate under hydrothermal conditions (the preparation method of the iron oxide nanorod array photoanode is the same as that in the paper Journal of Materials Chemistry A. 2014, 2, 13705-13712. The preparation method is the same) leaning against the reaction kettle, and the conductive surface on which the iron oxide nanorod array is grown on the substrate faces down;
[0015] Add ethylene glycol to two-thirds of the reactor and then seal it, and conduct a hydrothermal reaction at 100°C for 64 hours;
[0016] After natural cooling, the surface of the substrate was washed with deionized water and dried to obtain an ethylene glycol-treated iron oxide nanorod array photoanode.
[0017] The iron oxide nanorod array grown on the surfac...
Embodiment approach 2
[0021] This embodiment is substantially the same as Embodiment 1, except that the temperature of the hydrothermal reaction is 140° C., and the time of the hydrothermal reaction is 48 hours.
Embodiment approach 3
[0023] This embodiment is substantially the same as Embodiment 1, except that the temperature of the hydrothermal reaction is 160° C., and the time of the hydrothermal reaction is 24 hours.
[0024] In this embodiment, the current-voltage curve of the iron oxide nanorod photoanode treated with ethylene glycol at 160°C is as follows figure 1 As shown, it can be seen that the iron oxide nanorod array photoanode after being treated with ethylene glycol at 160° C. for 24 hours makes the anode current of the iron oxide nanorod array photoanode significantly increase.
[0025] In this embodiment, the Mott-Schottky curve of the iron oxide nanorod photoanode treated with ethylene glycol at 160°C is as follows figure 2 As shown, it can be seen that the slope of the straight line part of the Mott-Schottky curve of iron oxide treated at 160°C with ethylene glycol is significantly reduced, indicating that the donor concentration of the iron oxide nanorod array photoanode treated with eth...
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Abstract
The invention relates to the technical field of preparation of photoelectric functional materials. The invention discloses a method for improving the photoelectric response of a ferric oxide nanorod array photoanode. The method includes: an iron oxide nanorod array photoanode growing on the surface of a conductive substrate under a hydrothermal condition leans against a reaction kettle, the conductive surface, on which the iron oxide nanorod array grows, of the substrate is faced down, ethylene glycol is added into a reaction kettle by the amount of 2 / 3, the reaction kettle then is sealed anda hydrothermal reaction is performed for 0.1-64 hours; the reaction product is naturally cooled and the surface of the substrate is washed with deionized water, and drying is carried out to obtain theethylene glycol treated iron oxide nanorod array photoanode. Compared with the prior art, the photoelectric response of the iron oxide nanorod array photo-anode can be obviously improved by simply heating the iron oxide nanorod array photo-anode in an ethylene glycol solution, and the method is simple in step and easy to operate.
Description
technical field [0001] The invention relates to the technical field of preparation of photoelectric functional materials, in particular to a method for improving the photoelectric response of an iron oxide nanorod array photoanode. Background technique [0002] Using semiconductor materials to photocatalytically decompose water to produce hydrogen and oxygen is an effective way to convert solar energy into chemical energy, and it is also an ideal way to solve energy crisis and environmental pollution. Among many photoanode materials, Fe 2 o 3 It has attracted widespread attention of scientists due to its narrow band gap (2.4 eV) and high stability. However, the photogenerated charge of iron oxide is easy to recombine, the diffusion distance of photogenerated holes is short, and the conductivity is poor, which makes the activity of iron oxide photocatalytic water splitting relatively poor, and the photoelectric response is low. [0003] At present, the main methods to impr...
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