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本文通过水热法一步合成了还原氧化石墨烯(RGO)-Bi OBr纳米复合体,并进一步对其进行磷酸修饰.主要研究了所获得的纳米复合体的光电化学性质.结果表明,与纯Bi OBr相比,RGO-Bi OBr复合体的光电流密度明显提高.适量磷酸修饰后,其光电流密度进一步得到提高.基于羟基自由基等测试结果,分析认为磷酸修饰的RGO-Bi OBr纳米复合体光电流密度的提高主要归因于两方面:一是复合的还原氧化石墨烯能够接受光生电子,加快电子的转移,进而促进光生电荷的有效分离;二是复合体表面修饰的磷酸在溶液中电离形成负场,能够起到诱导光生空穴的作用,进一步促进了光生电荷的分离.
In this paper, the RGO-Bi OBr nanocomposite was synthesized in one step by hydrothermal method and further modified by phosphoric acid.The photoelectrochemical properties of the obtained nanocomposite were studied.The results showed that, Photocurrent density of RGO-Bi OBr complex was significantly higher than that of OBr.After the proper amount of phosphoric acid was added, the photocurrent density of RGO-Bi OBr complex was further improved.According to the test results of hydroxyl radicals and other results, it was considered that the phosphoric acid modified RGO-Bi OBr nanocomposite The photocurrent density enhancement is mainly attributed to two aspects: First, the composite reduced graphene oxide can accept photogenerated electrons to speed up the transfer of electrons, and thus promote the effective separation of photogenerated charge; second, the surface of the complex modified phosphoric acid in solution ionization The formation of a negative field, can play a role in inducing photo-generated holes, and further promote the separation of photo-generated charge.