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电化学实验报告实验报告
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E_perimental class on“Fuel Cell and Electrochemistry”
E_periment setup
Equipment: CHI760D electrochemical station
Three electrode system.
WE: CE: RE: Saturated Calomel Electrode
Solution: ×10-3mol/L K3 [ Fe (CN)6] + KCl
Lab report
Plot curves of LSV curve, and describe why current changes with sweeping voltage?
Reason: Voltage is a driving force to an electrode reactions, it is concerned with the equilibrium of electron transfer at electrode surface.
As the altering of lied voltage, the Fermi-level is raised (or lowered), which changing the energy state of the electrons.
Making the overall barrier height (ie activation energy) alter as a function of the lied voltage.
(1).
In this reaction, when voltage is , there is no electron transfer, so the current is zero.
With the voltage to the more reductive values, the current increases.
(2).
When the diffusion layer has grown sufficiently above the electrode so that the flu_ of reactant to the electrode is not fast enough to satisfy that required by Nernst Equation.
The peak is obtaining.
(3).
When the reaction continued, it would get a situation that there will be a lower reactant concentration at the electrode than in bulk solution, that is, the supply of fresh reactant to the surface