Method for dissociating an aqueous solution, which method comprises the following steps: a) a first electrochemical oxidation of the aqueous solution in the presence of pulsed light, which pulsed light is generated from a first light energy source at a predetermined pulse frequency value, and having a predetermined peak power, by an enzymatic composition, based on a first enzymatic complex PSII, isolated from a second enzymatic complex PSI, with production of oxygen, free electrons and free protons in the aqueous solution, b) a capture of said free electrons and said free protons, and c) a separate capture of oxygen, characterised in that - said light energy of said first source has an energy value which is variable over time, having a light energy value per second determined over a plurality of pulses of said pulsed light, and in that - said method further comprises a step of modulating said predetermined pulse frequency value of said pulsed light at a sufficient pulse frequency to obtain a first yield ( η 1) for producing oxygen per light energy unit which is greater than a factor ( f) from 1.01 to 100.00 at a second yield ( η 2) for producing oxygen per light energy unit obtained for a second electrochemical oxidation in the presence of continuous light, - said first and second yields ( η i) each being obtained from an oxygen production speed ( K ( O 2) i) per light energy unit, i = 1 or 2, such that: η i = K O 2 i E i where E i describes a quantity of energy per second provided to obtain said oxygen production speed ( K ( O 2) i), i = 1 or 2, - the factor ( f) being equal to a ratio between the first yield ( η 1) and the second yield ( η 2) such that: f = η 1 η 2 which pulsed light and continuous light have an equal predetermined wavelength, and the continuous light has a power equal to the predetermined peak power of the pulsed light. a) a first electrochemical oxidation of the aqueous solution in the presence of pulsed light, which pulsed light is generated from a first light energy source at a predetermined pulse frequency value, and having a predetermined peak power, by an enzymatic composition, based on a first enzymatic complex PSII, isolated from a second enzymatic complex PSI, with production of oxygen, free electrons and free protons in the aqueous solution, b) a capture of said free electrons and said free protons, and c) a separate capture of oxygen, - said light energy of said first source has an energy value which is variable over time, having a light energy value per second determined over a plurality of pulses of said pulsed light, - said method further comprises a step of modulating said predetermined pulse frequency value of said pulsed light at a sufficient pulse frequency to obtain a first yield ( η 1) for producing oxygen per light energy unit which is greater than a factor ( f) from 1.01 to 100.00 at a second yield ( η 2) for producing oxygen per light energy unit obtained for a second electrochemical oxidation in the presence of continuous light, - said first and second yields ( η i) each being obtained from an oxygen production speed ( K ( O 2) i) per light energy unit, i = 1 or 2, such that: η i = K O 2 i E i where E i describes a quantity of energy per second provided to obtain said oxygen production speed ( K ( O 2) i), i = 1 or 2, - the factor ( f) being equal to a ratio between the first yield ( η 1) and the second yield ( η 2) such that: f = η 1 η 2 which pulsed light and continuous light have an equal predetermined wavelength, and the continuous light has a power equal to the predetermined peak power of the pulsed light.