Cyclical salinity-gradient power generating system and method based on phase change materials and solar photothermal conversion

A cyclical salinity-gradient power generating system based on phase change materials and solar photothermal conversion, comprising:

• a power generating device comprising a first chamber storing high concentration solution, a second chamber storing low concentration solution, and an ion selective nanoporous membrane arranged between the first chamber and the second chamber, wherein cations in the first chamber are driven by a concentration gradient to directionally migrate into the second chamber through the ion selective nanoporous membrane, to form an ionic flux;
• a first electrode is arranged in the first chamber and a second electrode is arranged in the second chamber, electrons on the first electrode migrate from the first electrode to the second electrode via an external circuit;
• a phase change material (PCM) chamber arranged outside the first chamber and the second chamber and provided with phase change materials therein, wherein the phase change materials repeatedly undergo phase changing accompanied with heat storage and release, to provide heat for the first chamber and the second chamber, thereby maintaining a directional migration rate of the cations and to implement cyclical power generation.