Study On Photocatalytic Activity Of Fe ₂ P / CdS Based On Fe _X P Electrocatalytic Hydrogen Production

Hydrogen is considered as the most promising alternative to fossil fuels. Because it is a high energy capacity and clean energy carrier. At the same time, photocatalutic splitting water for hydrogen production become more and more important for the utilizing of hydrogen resources. In this dissertation, FeP nanoparticles and Fe₂P nanoparticles used as the co-catalysts have been prepared by calcining method. CdS is used as photocatalyst and the lactic acid is used as sacrificial electron donor in this efficient hydrogen production system.1. FeP nanoparticles were prepared by the calcining of Fe₃O₄ and NaH₂PO₂ at 400℃, and combined with CdS used as the photocatalyst to form hybrid catalyst. The 10% lactic acid was usedas the electron donor for photocatalyic hydrogen evolution. After all the components were characterized by different inorganic analysis method, and reaction conditions were optimized by variety pH and different concentration of FeP, photocatalytic generating hydrogen system containing 5mg 5wt% of FeP/CdS and pH = 2 was established. Under the LED irradiation（3W）, the average rate of hydrogen production at 202000 μmol·h-1·g-1 was achieved. But under sun-light irradiation as the rate at 10600 μmol·h- 1·g- 1 was also obtainedAccording to the obtained results, it was assumed that the efficiency separation of photoelectron and hole was effective due to induction of co-catalyst FeP.2. In order to investigate the bi-functionnal photocatlytic system containing Fe₂P and CdS, under the same condition, we found the hybrid system’s rate of hydrogen productiona reached 40100 μmol·h-1·g-1. In the test of electrocatalytic hydrogen evolution, a low overpotential about-0.2 V（VS RHE）was observed, the desity of current is-0.15 mA·cm-2.