where R is the universal gas constant (8.314472 J K -1 mol -1 ), T is the temperature in kelvin, z is the number of electron (-1), F is the Faraday constant (9.648533 × 10 4 C mol -1 ), and E°Ox,Red is the standard redox potentials. The decreased current of pc1 is considered to correspond to part of the increased current of prepeak, which is simulated as a positive shift in the cathodic peak potential of O2/O2 •-due to the HB effects forming the HB complex (the redox potential: E'Ox,Red). This prepeak was difficult to distinguish and observe at higher (1.0 V s -1 ) scan rates (Supporting Information, Figure ). . The standard redox potential of O2/O2 •-. The formation constants for the complex between O2/O2 •-and H2Q, Kf: O2-mH2Q, Kf -: O2 •--