Applications of Porous Activated Carbon-Silica Gel Composite Electrodes for Capacitive Deionization Process

Capacitive deionization(CDI) process kinds of electrochemical adsorption method was employed in order to solve the water deficient problems. In our study, porous activated carbon-silica gel composite electrodes with high wet-ability and mechanical strengths are invented by paste rolling method in our laboratory and investigated electrochemical characteristics such as current changed values as a function of time, coulombs, specific coulombs and chargedischarge efficiencies as a function of cycles until 10th and 100th cycles in 1,000 ppm NaCl solution. Porous activated carbon-silica gel composite electrodes showed efficient CDI performances with decreasing active material usages and increasing wet-ability, mechanical strengths in NaCl solutions. In our electrochemical runs, all of the activated carbonsilica gel composite electrodes also showed good cyclic-ability without destroy of active materials during cycles. The electrode-manufacturing times decreased by 50%. Average specific charge-coulombs by 100th cycles are also appeared very higher 0.456(C composite electrode) than 0.317 (A min.)/g(A electrode). The charge-discharge efficiencies by 100th cycles are showed good cycle-ability and appeared over 73% and 75.6% in case of A electrode and C composite electrode. However, at the 100th cycles, 76% of charge-discharge efficiencies is showed in C composite electrode but 66% of charge-discharge efficiencies is showed in A electrode.