Preparation method of cobalt-oxygen-oxygen-hydrogen-modified phosphorus-doped iron oxide photo-anode

A technology of iron oxide light, cobalt oxygen oxygen hydrogen, applied in the direction of electrode, superimposed layer plating, coating, etc., can solve the problems of low flat band potential, short hole diffusion distance, slow oxygen evolution reaction kinetics, etc. To achieve the effect of conversion and performance improvement

Inactive Publication Date: 2019-03-22
CHANGZHOU UNIV
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  • Application Information

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Problems solved by technology

However, the reported oxidation efficiency of iron oxide water is lower than this predicted value, mainly due to the very short lifetime of photogenerated carriers, short hole diffusion distance, slow kinetics of oxygen evolution reaction, and low flat band potential.

Method used

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  • Preparation method of cobalt-oxygen-oxygen-hydrogen-modified phosphorus-doped iron oxide photo-anode
  • Preparation method of cobalt-oxygen-oxygen-hydrogen-modified phosphorus-doped iron oxide photo-anode
  • Preparation method of cobalt-oxygen-oxygen-hydrogen-modified phosphorus-doped iron oxide photo-anode

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Experimental program
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Effect test

specific Embodiment 1

[0019] α-Fe 2 o 3 The preparation method of photoanode comprises the steps:

[0020] 1) The FTO was ultrasonically cleaned with isopropanol, acetone, ethanol and water in sequence. After the FTO was cleaned and dried, the back-to-back and vertical inner substrate surface (FTO's SnO 2 Facing the lining wall) placed on the PTFE lining. Add 0.81g FeCl to 20mL aqueous solution 3 •6H 2 O, and 1.69 g Na 2 NO 3 , stirred for 20min. The stirred solution was added into the polytetrafluoroethylene lining, and then the polytetrafluoroethylene lining was placed in an autoclave and sealed, and heated in a muffle furnace at 100° C. for 6 hours. After hydrothermal treatment, a light yellow translucent β-FeOOH film grew on the FTO, and the β-FeOOH film was washed with deionized water and air-dried.

[0021] 2) Put β-FeOOH in a muffle furnace for heat treatment. The heat treatment process is a two-step annealing method. First, the temperature is raised to 550°C for 2 hours, and then d...

specific Embodiment 2

[0022] P-Fe 2 o 3 The preparation method of photoanode comprises the steps:

[0023] 1) consistent with specific embodiment 1 step 1;

[0024] 2) Weigh 0.38g Na 3 PO 4 •12H 2 O and dissolved in 20mL deionized water, configured as a 0.05mol / L sodium phosphate solution, soaked the β-FeOOH prepared in step 1 in the sodium phosphate solution for 30s~480s, the results showed that the performance was optimal when the soaking time was 180s ;

[0025] 3) heat-treat the β-FeOOH after phosphorus treatment in step 2, and the heat treatment conditions are the same as step 2 in the specific example 1 to obtain phosphorus-doped iron oxide photoelectrode (P-Fe 2 o 3 ).

specific Embodiment 3

[0026] CoOOH-Fe 2 o 3 The preparation method of photoanode comprises the steps:

[0027] 1) Weigh 0.06g C 4 h 6 CoO 4 • 4H 2 O and dissolved in 25mL deionized water, configured as 0.01M cobalt acetate solution;

[0028] 2) Fe obtained in specific example 1 2 o 3 The photoanode is used as the working electrode, the platinum sheet electrode is used as the counter electrode, and the Ag / AgCl electrode is used as the reference electrode to form a three-electrode system. Using the cobalt acetate solution configured in step 1 as the electrolyte, under simulated sunlight (AM 1.5G, 100mWcm -2 ) for light-assisted electrodeposition with a deposition voltage of 0V (vs Ag / AgCl); 3) for a deposition time of 30s to 500s to obtain a cobalt oxyhydrogen modified iron oxide photoelectrode (CoOOH-Fe 2 o 3 ), the results show that the performance is optimal when the deposition time is 90s.

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Abstract

The invention relates to a preparation method of a cobalt-oxygen-oxygen-hydrogen-modified phosphorus-doped iron oxide photo-anode, and belongs to the technical field of new energy materials. The preparation method comprises the following steps that beta-FeOOH is generated on a F-doped tin oxide (FTO) conductive glass substrate through a hydrothermal method, then, the phosphorus-doped iron oxide photo-anode is generated by performing soaking in a phosphate solution and performing heat treatment, and finally, a layer of CoOOH is deposited on the surface of the phosphorus-doped iron oxide photo-anode by using a light-assisted electrodeposition method so as to obtain the cobalt-oxygen-oxygen-hydrogen-modified phosphorus-doped iron oxide photo-anode (CoOOH-P-Fe2O3). Due to phosphorus doping, the conductivity of the iron oxide photo-anode is improved; and furthermore, cobalt oxygen hydrogen is used as a catalyst for assistance in oxygen evolution, so that compared with basic iron oxide, thelight current density of the cobalt-oxygen-oxygen-hydrogen-modified phosphorus-doped iron oxide photo-anode prepared by using the method is improved by 200%.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and in particular relates to a preparation method of cobalt oxyhydrogen modified phosphorus-doped iron oxide photoanode. Background technique [0002] Photoelectrochemical (PEC) cells convert solar energy into stored chemical energy by splitting water into oxygen and hydrogen. In recent years, iron oxide (α-Fe 2 o 3 ) have been extensively studied as photoanode materials for water splitting due to their favorable optical bandgap (Eg = 2.2eV), excellent chemical stability in aqueous environments, natural abundance, and low cost. Theoretically, the water oxidation efficiency of iron oxide can reach 12.4%. However, the reported oxidation efficiency of iron oxide water is lower than this predicted value, mainly due to the very short lifetime of photogenerated carriers, short hole diffusion distance, slow kinetics of oxygen evolution reaction, and low flat band potential. [0003] The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/04C25B11/06C23C28/04
CPCC23C28/04C25B1/04C25B1/55C25B11/091Y02E60/36
Inventor 刘长海徐宇陈智栋
Owner CHANGZHOU UNIV
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