Method of improving photoelectric conversion efficiency of p-Si/PtSi photocathode decomposed water
A photoelectric conversion efficiency, photocathode technology, applied in the field of photoelectrochemistry, can solve the problem of low turn-on potential, achieve the effect of improving operation, improving catalytic activity of hydrogen production, and low cost
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Embodiment 1
[0036] This embodiment prepares p-Si / PtSi photocathode:
[0037] At 75°C, a B-doped single crystal p-Si sheet with a resistivity of 8-12 Ω·cm was placed in H 2 O:H 2 o 2 :NH 4 Soak in a solution with OH volume ratio of 5:1:1 for 10 minutes. The soaked p-Si flakes were then placed in H 2 SO 4 :H 2 o 2 Clean by immersing in a solution with a volume ratio of 3:1 at 120°C for 15 minutes. Soak the cleaned p-Si sheet in a 5% HF solution for 10 seconds to remove the surface oxide layer, then wash it with deionized water and dry it in a rotary drying oven under inert gas N 2 Tumble dry under cover. The dried p-Si sheet was immediately put into the magnetron sputtering chamber, and a Pt film with a thickness of about 8 nm was deposited on the p-Si sheet with a platinum target at a deposition rate of 4 nm / min. Put the p-Si sheet deposited with Pt thin film into the rapid heat treatment furnace, in the high-purity N 2 Rapid heat treatment at 550° C. for 30 seconds in the atmos...
Embodiment 2
[0039] In this embodiment, the p-Si / PtSi photocathode is electrochemically oxidized using the constant current method:
[0040] In 1M KOH aqueous solution, the p-Si / PtSi photocathode, graphite rod electrode and mercury / mercury oxide electrode prepared in Example 1 were used as the working electrode, counter electrode and reference electrode respectively, and the work was performed by a CHI 660E electrochemical workstation. The electrode applied current density is 1×10 -5 A / cm 2 The constant current was maintained for 30 minutes to obtain the p-Si / PtSi photocathode treated by electrochemical oxidation.
[0041] figure 1 Shown are the XPS spectra of the p-Si / PtSi photocathode before and after electrochemical oxidation treatment. Through the analysis of this result, it can be seen that the PtSi on the surface of p-Si / PtSi after the electrochemical oxidation treatment is transformed into a platinum-silicon compound Pt in the platinum-rich phase. x Si(x>1).
[0042] Figure 2...
Embodiment 3
[0047] In this embodiment, the p-Si / PtSi photocathode is electrochemically oxidized using the constant current method:
[0048] In 1M KOH aqueous solution, the p-Si / PtSi photocathode, graphite electrode and mercury / mercury oxide prepared in Example 1 were used as the working electrode, counter electrode and reference electrode respectively, and applied to the working electrode through the CHI 660E electrochemical workstation. Current density 1×10 -3 A / cm 2 The constant current was maintained for 30 minutes to obtain the p-Si / PtSi photocathode treated by electrochemical oxidation.
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