Figure 7

Numbers of electron transfer during redox reaction of PW₁₂ (a) or PMo₁₂ (b) and glucose (The concentrations of PW₁₂ and glucose were 0.3 and 2 mol/L, respectively; the concentrations of PMo₁₂ and glucose were 0.1 and 0.6 mol/L, respectively; the concentration of phosphoric acid in anolyte was 1.5 mol/L).