The purpose of this study was to gain a better understanding of the temperature and concentration distributions caused by thermosolutal convection in an electrochemical system in a two-lower-partition enclosure whose aspect ratio was 0.5. The temperature gradient was maintained and controlled using two separate constant-temperature baths, which circulated heated or cooled water through a heat exchanger. The working fluid was aqueous copper sulfate. An electrochemical method based on a diffusion-controlled electrode reaction was employed to create the concentration gradient. We used the shadowgraph recording technique to visualize and analyze the flow. Thermal Grashof numbers ranging from 4.08 x 10(5) to 8.16 x 10(5) and solutal Grashof numbers ranging from 2.55 x 10(6) to 6.15 x 10(6) were investigated. It was demonstrated that the two partitions affected the partition ratio (Ap = 0.25) and the flow pattern. For fixed Gr(m) and Ap, a correlation of the Sherwood number was given and it was demonstrated that the mass transfer rate increased with increasing thermal Grashof numbers. Results showed that increasing temperature differences by two times would increase the Sherwood number by 14% in this system.