Solar water taking and power generating device and method for water taking and power generating

A solar water taking and power generating device, comprising:

• a seawater tank for storing seawater, which is provided with an opening facing sunlight;
• a fresh water tank for storing the condensed freshwater;
• a condensation water taking unit comprising a concentrating-cooling plate for gathering sunlight and at least one freshwater collecting channel formed between the seawater tank and the concentrating-cooling plate, wherein the opening is enclosed by the concentrating-cooling plate, and the freshwater collecting channel is connected to the freshwater tank;
• and,
• a power generation unit floating on the surface of the seawater, comprising,
• a cation exchange membrane comprising a semiconductor film body for generating the photo-Dember effect, nanoparticles provided at a first side of the semiconductor film body facing the concentrating-cooling plate, and a capillary water-transporting conduit for transporting seawater from a second side to the first side, wherein the semiconductor film body is provided with cation-selective channels;
• and
• an external circuit comprising a first electrode arranged on the first side and a second electrode arranged on the second side, wherein sunlight irradiates the cation exchange membrane and the nanoparticles through the concentrating-cooling plate, so that the first temperature, the first seawater concentration and the first electric potential of the first side are higher than the second temperature, the second seawater concentration and the second electric potential of the second side, respectively;
• subsequently, the evaporated seawater enters the freshwater tank through the freshwater collecting channel after being condensed, cations directionally transfer from the first side to the second side through the cation-selective channels to form an ion current, and electrons of the external circuit transfer from the first electrode to the second electrode to generate a current.