Preparation of cu-solid polymer electrolyte composite electrodes and application to gas-phase electrochemical reduction of CO2

✍ Scribed by Seiji Komatsu; Michie Tanaka; Akira Okumura; Akira Kungi

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 938 KB
• Volume: 40
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(94)00325-u

✦ Synopsis

Preparation of Cu-solid polymer electrolyte (spe) composite electrodes for gas-phase electrochemical reduction of CO, was studied by electroless plating methods. Among the combinations of plating solutions and reducing solutions used, the combination of Cu-Rochelle salt and 10% NaBH, gave the most etlicient spe electrode. With the electrodes made of cation-exchange (Nafion) and anionexchange (Selemion) membranes as spe materials, the total current efficiencies for reduction products of CO, had maximum values of 19 and 27X, respectively. The use of the former gave C,H, as the major product, whereas, with the later, HCOOH and CO were obtained. From gas-phase electrolysis of the dummy exhausted gas from thermal-power plants, it was found that NO has no influence on the electroreduction of CO,, but the removal of SO, is needed in order to obtain CIH, in higher current densities. Furthermore CO, in the exhausted gas is required to be concentrated up to more than ca. 30%.