Co和P掺杂对α-Fe_2O_3光电化学催化分解水的影响

Effect of Co and P doping on α-Fe_2O_3 photoelectrochemical catalysis water splitting

在众多光阳极材料中,纳米结构材料α-Fe_2O_3由于其光吸收显著、化学稳定性好、储量丰富等优势,被认为是最有前途的材料之一。利用水热法制备了具有良好光解水性能的Co和P掺杂α-Fe_2O_3纳米材料。经过掺杂后α-Fe_2O_3纳米材料仍为纳米棒状形貌,纳米棒的粒径增加。实验发现,Co掺杂α-Fe_2O_3制成的电极在标准光照射下的最大光生电流密度为0.453 m A/cm2,是未掺杂样品的20.6倍,P掺杂α-Fe_2O_3制成的电极在标准光照射下的最大光生电流密度为0.276 m A/cm2,是未掺杂样品的12.5倍,具备了高效光解水性能。同时通过SEM、TEM、XRD、UV-Vis和Mott-Schottky测试等方法,结合形貌与结构表征,研究了α-Fe_2O_3的光电化学分解水性能影响机理。

Among many photoanode materials,the nanostructured material α-Fe2O3 is considered as one of the most promising materials due to its remarkable light absorption,good chemical stability and abundant reserves. Co and P doped α-Fe2O3 nanomaterials with excellent water splitting properties were prepared by hydrothermal method. After doping,α-Fe2O3 nanomaterial is still nanorod shaped,and the particle size of nanorods increases. Experiments show that the maximum photocurrent density has reached 0. 453 m A/cm2（Co doped α-Fe2O3） and 0. 276 m A/cm2（P doped α-Fe2O3） in the standard light,which are 20. 6 and 12. 5 times higher than those of the undoped samples,respectively. Thus,they have the property of efficient photocatalytic water splitting. At the same time,we used SEM,TEM,XRD,UV-Vis,and Mott-Schottky testing methods,which are combined with the morphology and structure characterization,to study the property influence mechanism of photoelectrochemical water splitting of α-Fe2O3.