Electrocatalytic Reduction of Hydrogen Peroxide on Palladium-Gold Codeposits on Glassy Carbon: Applications to the Design of Interference-Free Glucose Biosensor

Table 1

Electrode sensitivities (determined from the linear portions of the calibration graphs at temperatures 25 and 30 degree, correlation coefficients ranging between 0.98 and 0.99) and linear dynamic ranges of GC electrodes modified with microquantities of (Pd+Au) mixtures during hydrogen peroxide electrochemical reduction; temperatures 25 and 35°C; phosphate-citrate buffer pH 7.0; reference electrode Ag/AgCl (1 M KCl).

𝐸 (mV)	𝑇 (°C)	Sensitivity (μA μM^−1)				Linearity (μM)*
		electrode type				electrode type
		A	B	C	D	A	B	C	D
−100	25	0.27	0.42	0.28	0.47	900	800	870	830
	35	0.27	0.45	0.40	0.55
−50	25	0.26	0.35	0.19	0.36	800	980	1020	760
	35	0.19	0.31	0.30	0.51
0	25	0.25	0.31	0.14	0.30	680	900	830	800
	35	0.12	0.23	0.21	0.35

*Linearity ranges for all 4 types of GC electrodes were determined at 25°C.