光解水α-Fe2O3电极表面的研究

本文利用Ar⁺轰击正分的α-Fe₂O₃表面,证明了轰击后的表面呈类FeO性质,存在Fe⁺⁺。提出了由于表面Fe⁺⁺的3d电子的催化作用,Fe⁺⁺能把吸附在它上面的H₂O先分解成OH-和H⁺,因而有助于提高光解水的效率的看法。用UPS和XPS等技术证实了类FeO表面吸附水后存在OH^-,确认Fe^{++关键词：}

SURFACE STUDY ON α-Fe2O3 ELECTRODE FOR PHOTODECOMPOSITION OF WATER

We studied the surface of stoichiometric α-Fe₂O₃ sample bombarded by Ar⁺ ion beam, the Fe⁺⁺ ion was identified on it and the surface was found to become FeO-like in property. In addition, the results of UPS and XPS analysis indicated that OH-existed on the FeO-like surface during water adsorption and the Fe⁺⁺ was the active center of water decomposition. We propose that water molecules adsorpted onto the surface can preliminarily be seperated into OH^- and H⁺ due to the catalysis of 3d electrons of Fe⁺⁺ ions on the surface. So, in order to raise the efficiency of photo-decomposition of water, it is not only important to modify the band structure, but also to create Fe⁺⁺ ions on the α-Fe₂O₃ surface.