Method of operating electrochemical device

1 . A method of operating an electrochemical device including a function electrode containing a first active material, and a counter electrode containing a second active material, the electrochemical device being configured to adsorb and release a predetermined gas, the method comprising the steps of:

applying a first adsorption voltage to the function electrode before supplying the predetermined gas to the function electrode;

supplying the predetermined gas to the function electrode after applying the first adsorption voltage to the function electrode; and

switching the first adsorption voltage to a second adsorption voltage higher than the first adsorption voltage while maintaining the supply of the predetermined gas to the function electrode,

wherein the step of switching the first adsorption voltage to the second adsorption voltage is performed based on a current value flowing through the electrochemical device as a reference,

wherein the first adsorption voltage is switched to the second adsorption voltage when the current value flowing through the electrochemical device becomes less than a first threshold value, and

wherein the first threshold value is a current value when the residual adsorption amount of the function electrode at the adsorption voltage reaches 30%.

2 . The method of operating an electrochemical device according to claim 1 , further comprising a step of, after applying the second adsorption voltage to the function electrode, applying a release voltage having reverse polarity to the adsorption voltage to the function electrode.

3 . The method of operating an electrochemical device according to claim 1 , wherein a second residual adsorption amount of the gas which the function electrode is capable of further adsorbing after a step of applying the second adsorption voltage to the function electrode is smaller than a first residual adsorption amount of the gas which the function electrode is capable of further adsorbing after the step of applying the first adsorption voltage to the function electrode.

4 . The method of operating an electrochemical device according to claim 1 ,

wherein the predetermined gas is carbon dioxide,

wherein the first active material includes anthraquinone,

wherein the second active material includes polyvinylferrocene,

wherein the first adsorption voltage is 1.2 V or more and less than 1.6 V, and

wherein the second adsorption voltage is 1.6 V or more.

5 . The method of operating an electrochemical device according to claim 4 , wherein an average adsorption voltage to be applied to the function electrode per unit time is 1.4 V or less.