Optimization of electrode composition. Effect of electrode composition on H2O2 sensing. The electrode compositions are as mentioned in Section 2.5. Note: The data for C4 composition are the same as shown in Fig. 3c. Inset shows the effect of NH2-SBA-15 (without and with Ag) on sensitivity. Conditions: −0.4 V (vs. SCE), 20 ml of N2 saturated buffer solution of pH 7.