An experimental study of electroreduction of CO2 to HCOOH on SnO2/C in presence of alkali metal cations (Li+, Na+, K+, Rb+ and Cs+) and anions (HCO3-, Cl-, Br-and I-)

• 作者: Jin Yi Jiujun Zhang Qi Zhang Xiaolin Shao Yuyu Liu
• 来源期刊: 中国化学工程学报（英文版）
• 年，卷（期）: 2020,（10）
• 所属期刊栏目: Catalysis, Kinetics and Reaction Engineering
• 页码范围: 2549-2554
• 页数: 6页
• 语种: 英文

摘要

It is well-known that the electrolytes can influence the electrochemical reduction of carbon dioxide (ERCO2) in aqueous media.In this work,we explore the effects of alkali metal cations and anions (Li+,Na+,K+,Rb+,Cs+,HCO3-,Cl-,Br-,I-) on the current density and product selectivity for the ERCO2 into formic acid (HCOOH) on the SnO2/carbon paper (SnO2/C) electrode.Results of the ERCO2 experiments show that for the cations,the promotion effects on current density and faradaic efficiencies (FEs) are in the order of Li+ ＜ Na+ ＜ K+ ＜ Cs+ ＜ Rb+.For the anions,the current density values are in the order of NaHCO3 ＜ NaCl ＜ NaBr ＜ NaI and KHCO3 ＜ KCl ≈ KI ＜ KBr,respectively,and that on the FEs for the formation of the HCOOH (FEHCOOH) is HCO3-＜ Cl-＜ Br-＜ I-.Based on this result,the effects of alkali metal cations and anions on ERCO2 are discussed.