Study On Photoelectric Properties Of Iron Oxide Semiconductor

With the progress of the industrial revolution,the consumption of fossil fuels is increasing.Traditional energy sources such as coal,oil and natural gas have been difficult to support the long-term development of human society.Therefore,the search for new energy sources has become a hotspot and focus on current technological research in various countries.As we all know,solar energy is the most abundant renewable energy in the world.Hydrogen is a clean and high-energy-density energy carrier.Photoelectrochemical water splitting is an effective means to convert abundant solar energy into chemical energy.In this process,the choice of photoanode materials is particularly critical.Iron is one of the most abundant elements in the earth.Iron oxide is also easy to prepare,low cost,non-toxic and harmless,and has high theoretical photoelectric conversion efficiency,suitable bandwidth,and excellent photoelectrochemical stability.It is considered to be one of the most promising photoanode materials.This paper studies in detail the photoelectric properties of the heterostructure of ferrous oxide and iron oxide,as well as the photoelectrochemical water splitting and self-driving near-infrared detection capabilities of the prepared new rhombohedral iron oxide,and a series of test and characterization are carried out.The specific content is as follows:(1)A layer of FeOOH film was prepared on the FTO substrate by hydrothermal method,and then immersed in a SnCl2 alcohol solution for a period of time.Finally,the immersed and dried sample was annealed in a tube furnace at 550? for 2h to obtain FeO/Fe2O3 heterostructure,SEM,HRTEM,XRD,XPS proved the existence and combination of the two materials.IT,LSV and other photoelectrochemical test results show that compared with single-phase ?-Fe2O3,the performance of FeO/Fe2O3 heterostructure has been greatly improved in self-driving visible light detection and photoelectrochemical water splitting.The successful results of light hydrogen production experiments are broken the inherent view that iron oxide can only produce oxygen.And this experiment provides a new idea for the realization of the complete water solution of light.(2)A new type of diamond-shaped FeOOH was prepared on the FTO substrate by a hydrothermal method,and then annealed at 550? for 2 hours in a tube furnace under nitrogen atmosphere to obtain samples.The test results of XRD and Raman proved the successful preparation of ?-Fe2O3,the test results of SEM showed the good thermal stability of the sample,and the test results of XPS revealed the content and existence of Fe and O elements.The photoelectrochemical performance test results of LSV and IPCE showed that the new rhombohedral iron oxide has significantly improved photoelectrochemical water oxidation ability and photoelectric conversion efficiency compared with the traditional rectangular iron oxide.(3)A hydrothermal-annealing method similar to the previous work was used to prepare diamond iron oxide.UV test results show that diamond iron oxide has a stronger ability to absorb near-infrared light than traditional iron oxide.It is illuminated by a light source with a wavelength of 808nm.Only diamond-shaped iron oxide detects the generation of photocurrent.Under the influence of the near-infrared photothermal effect,the photocurrent of diamond-shaped iron oxide has a continuous increase.This phenomenon is the self-driving iron oxide with simple preparation method and convenient performance enhancement.Infrared detectors provide broad application prospects.