Method for preparing a boron-doped ferric oxide photoelectrode
A technology of ferric oxide and fluorine-doped tin oxide, which is applied in electrodes, electrolytic components, electrolytic processes, etc., can solve the problem of low efficiency of nanorod photoanode photocatalytic water splitting, achieve uniform shape, simple method, low cost effect
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Embodiment 1
[0028] 1.1 Stir and mix 2.43g of anhydrous ferric trichloride and 100mL of deionized water evenly, then add 0.85g of sodium nitrate and stir evenly to obtain a dark reddish brown solution.
[0029] 1.2 Put the reddish-brown liquid in 1.1 into a hydrothermal reaction kettle, add clean FTO, seal it, and keep it warm at 95°C for 4 hours. After the reaction, wash off the excess salt on the surface of the FTO with deionized water to obtain light yellow needle iron Mine (β-FeOOH) electrode.
[0030] 1.3 Soak the β-FeOOH electrode in 1.2 in 0.08mol / L borax solution, take it out after 5 minutes and put it into a muffle furnace for calcination at 550°C for 2 hours, then continue to calcine at 650°C for 25 minutes , take it out after annealing, and wash the residual salt on the surface with deionized water to obtain a brick-shaped boron-doped ferric oxide photoelectrode.
[0031] figure 1 It is the X-ray diffraction spectrum (XRD) of the brick-shaped boron-doped ferric oxide photoelec...
Embodiment 2
[0038] 2.1 Stir and mix 2.43g of anhydrous ferric trichloride and 100mL of deionized water evenly, then add 0.85g of sodium nitrate and stir evenly to obtain a dark reddish brown solution.
[0039] 2.2 Put the reddish-brown liquid in 1.1 into a hydrothermal reaction kettle, add clean FTO, seal it, and keep it warm at 95°C for 5 hours. After the reaction, wash off the excess salt on the surface of the FTO with deionized water to obtain light yellow needle iron Mine (β-FeOOH) electrode.
[0040] 2.3 Soak the β-FeOOH electrode in 1.2 in 0.1mol / L borax solution, take it out after 5 minutes and put it into the muffle furnace to program the temperature to 550°C for 2 hours, then continue to program the temperature to 650°C for 25 minutes , take it out after annealing, and wash the residual salt on the surface with deionized water to obtain a brick-shaped boron-doped ferric oxide photoelectrode.
[0041] image 3 It is a scanning electron microscope image (SEM) of the brick-shaped ...
Embodiment 3
[0043] Photocurrent detection: This photoelectrochemical experiment was performed under a three-electrode system. 1M sodium hydroxide was used as the electrolyte, the ferric oxide electrode prepared in Example 1 was used as the working electrode, the platinum wire was used as the counter electrode, and the saturated Ag / AgCl was used as the reference electrode. The light source is 300W xenon lamp, plus AM 1.5G filter, the light intensity is 100mW / cm 2 . Electrochemical linear scan, scan range -0.4-0.6V Ag / AgCl , scan speed 50mV / s.
[0044] The formula to convert the potential to the reversible hydrogen potential is:
[0045] E. RHE =E Ag / AgCl +0.059*pH+E o Ag / AgCl
[0046] At 25°C, E o Ag / AgCl = 0.197V vs RHE.
[0047] Figure 4 It is the water oxidation photocurrent curve. It can be seen from the figure that the photoelectric current of the nanorod-shaped ferric oxide photoelectrode is only 0.03mA / cm within the voltage range shown in the figure. 2 ; while the nano-b...
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