Simultaneous CO2 Reduction and Dye (Crystal Violet) Removal Electrochemically on Sn and Zn Electrocatalysts Using Co3O4 Anode
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- 作者：V. S. K. Yadav ; M. K. Purkait
- 刊名：Energy & Fuels
- 出版年：2016
- 出版时间：April 21, 2016
- 年：2016
- 卷：30
- 期：4
- 页码：3340-3346
- 全文大小：448K
- 年卷期：0
- ISSN：1520-5029
文摘
The simultaneous reduction of CO<sub>2sub> to product electrochemically (RCPE) was studied on Sn and Zn electrocatalysts and oxidation of dye (crystal violet (CV)) at Co<sub>3sub>O<sub>4sub> electrocatalyst. The electrodes for anode and cathode were prepared by coating the electrocatalysts on the graphite surface. The experimental studies were done in aqueous 0.5 M NaHCO<sub>3sub> and KHCO<sub>3sub> electrolyte solutions with CV (10 ppm) at different applied voltages (2–3.8 V). The results in forming product and CV dye removal were shown in time intervals of 5, 10, 15, 20, and 25 min, respectively. However, HCOOH was the only reduced product formed from RCPE, along with removal of CV observed for the applied experimental conditions. High Faradaic efficiency of 45.33% for HCOOH at Zn electrocatalyst in KHCO<sub>3sub> solution was observed in reaction time of 5 min. Maximum dye removals for Sn and Zn electrocatalyst are reported to be 64.3 and 61% in NaHCO<sub>3sub> electrolyte solution, and similarly dye removals of 71.5 and 60.9% were obtained in KHCO<sub>3sub> electrolyte at 2.8 V for 25 min. It was observed that as applied voltages increases Faradaic efficiency decreases and CV removal increases. These results reveal the solution for simultaneous CO<sub>2sub> reduction to HCOOH and purification of colored water. The proposed process may assist to develop new ideas in order to improve the simultaneous RCPE with dye removal.