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通过由R-藻红蛋白(R-PE)LB膜组成的光电池,研究了R-PE的电荷转移现象及光电化学行为.实验表明,由R-PE LB膜组成的光电池能产生光生电流,且当电解质溶液中存在电子给体和受体时光电流明显增大,说明R-PE光生电流的产生是由电荷转移引起的.进一步的对比实验说明,其光生电流是来源于蛋白所含发色团的光诱导电荷分离性质;光电流作用光谱也进一步证实了上述观点.当电解质溶液中存在或不存在电子给体时,光电流方向总是流向饱和甘汞电极(SCE),说明电子是从R-PE注入SnO_2光学透明电极(SnO_2 OTE)的导带;当电解质液中存在电子受体时,光电流方向总是流向SnO_2 OTE,说明这时电子是从SnO_2电极的导带注入R-PE分子.据此提出了R-PE光诱导电荷转移的机制.经测定由R-PE LB膜组成的光电池的光电转换量子效率Ф_(520MM)=3.4%,光生电势达400mV,且具有很好的光学稳定性,这说明R-PE是优良的生物光电转换功能材料.实验中,还测定了电解质溶液pH值,电子给体浓度,蛋白LB膜层数及光照时间对R-PE光电流的影响.
The charge transfer phenomenon and the photoelectrochemical behavior of R-PE were studied by a photoelectrical cell composed of R-phycoerythrin (R-PE) LB film. The experiment shows that the photocell composed of R-PE LB film can generate photocurrent, and When the presence of electron donor and acceptor in the electrolyte solution, the photocurrent increases obviously, indicating that the photocurrent of R-PE is caused by the charge transfer.Further comparative experiments show that the photocurrent is derived from the protein-containing chromophore Of photo-induced charge separation properties; photocurrent also further confirmed this view.When the electron donor is present or absent in the electrolyte solution, the photocurrent direction always flows to the saturated calomel electrode (SCE), indicating that the electron is from the R -PE is injected into the conduction band of the SnO 2 OTE. When the electron acceptor is present in the electrolyte, the photocurrent direction always flows to the SnO 2 OTE, indicating that the electrons are injected into the R-PE molecule from the conduction band of the SnO 2 electrode The mechanism of photoinduced charge transfer of R-PE was put forward.Photoelectric conversion quantum efficiency (Ф 520MM) = 3.4% and photogenerated potential up to 400mV were determined by R-PE LB films and had good optical Stability, which shows that R-PE is excellent The biological function of the photoelectric conversion material experiment was also measured pH value of the electrolyte solution, the electron donor concentration, the number of layers and the protein LB illumination time of R-PE photocurrent.