PBS溶液作为一种缓冲溶液，能够缓冲反应体系中酸碱和电荷变化，对体系中

As a buffer solution, PBS solution can buffer the acid-base and charge changes in the reaction system, and hinder the electron transfer in the system to a certain extent. Therefore, the modified electrode is used in 50 mmol•L-1 PBS solution (pH value respectively 5.00, 6.00, 6.80, 7.20) is the reaction system of supporting electrolyte, there is no obvious current response change, and there is no characteristic redox peak of polyoxometalate in its cyclic voltammetry. Therefore, ultrapure water (pH 6.88), 0.5 mol•L-1 Na2SO4 solution (pH 7.02) and 50 mmol•L-1 PBS solution (pH 5.00, 6.00, 6.80, 7.20, respectively) are not suitable As the supporting electrolyte of [(2, 2'-bipy/P2Mo18)10] multilayer composite film modified electrode.

PBS solution as a buffer solution, can buffer the reaction system acid and alkali and charge changes, the system of electron transfer plays a certain role in impeding, so modified electrodes in 50 mmol L-1 PBS solution (pH values are 5. 00, 6.00, 6.80, 7.20) In the reaction system that supports electrolytes, there is no obvious change in current response, and there is no characteristic redox peak of polymetallic oxygenates in the circular VIAN diagram. Therefore, ultra-pure water (pH of 6.88), 0.5 mol-L-1 Na2SO4 solution (pH of 7.02) and 50 mmol L-1 PBS solution (pH of 5.00, 6.00, 6.80, 7.20) are not suitable as 2'-bipy/P2Mo18)10) Multi-layer composite film modification electrolytes support electrolytes.

PBS solution, as a buffer solution, can buffer the changes of acid-base and charge in the reaction system, and hinder the electron transfer in the system to a certain extent In the reaction system with PBS solution (pH 5.00, 6.00, 6.80, 7.20) as supporting electrolyte, there is no obvious change of current response, and there is no characteristic redox peak of polyoxometalate in its cyclic voltammogram. Therefore, ultrapure water (pH = 6.88), 0.5 mol · L-1 Na2SO4 solution (pH = 7.02) and 50 mmol · L-1 PBS solution (pH = 5.00, 6.00, 6.80, 7.20) are not suitable as supporting electrolytes for [(2,2 '- bipy / p2mo18) 10] multilayer composite film modified electrode.<br>