In-situ oxidation reduction reaction-based dopamine photoelectrochemistry detection method

The invention discloses a fast and simple dopamine photoelectrochemistry analysis detection method based on an in-situ oxidation reduction reaction of dopamine and graphene oxide. In an alkalescent electrolyte, dopamine and graphene oxide undergo an oxidation reduction reaction so that graphene oxide is reduced, the oxidized dopamine polymer can be used as an electron acceptor and is adsorbed by a reduced graphene oxide-modified electrode so that a cathode photo current is increased, and the photo current increasing degree and tested dopamine content are in a linear relationship and thus the prepared label-free photoelectrochemical sensor realizes simple and environmentally friendly reduction of graphene oxide, and realizes fast, simple and sensitive determination of dopamine. Because of the specific oxidation reduction reaction, the method utilizes a simple apparatus, is environmentally friendly, does not produce toxins, has high selectivity and can be successfully used for detection of human urine dopamine.