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DOI	10.1039/d0ee00047g
	Insights into the carbon balance for CO2 electroreduction on Cu using gas diffusion electrode reactor designs
	Ma M.; Clark E.L.; Therkildsen K.T.; Dalsgaard S.; Chorkendorff I.; Seger B.
发表日期	2020
ISSN	1754-5692
起始页码	977
结束页码	985
卷号	13 期号:3
英文摘要	In this work, the carbon balance during high-rate CO2 reduction in flow electrolyzers was rigorously analyzed. The CO2 consumption at gas-diffusion electrodes due to electrochemical conversion and reaction with OH- at the electrode/electrolyte interface leads to a substantial reduction in the volumetric flowrate of gas flow out of the electrolyzer, especially when highly concentrated alkaline electrolytes and elevated current densities are utilized, which is primarily due to an elevated pH at cathode/electrolyte interface. Without considering the CO2 consumption, the faradaic efficiencies for major gas products could be significantly overestimated during high current density CO2 reduction conditions, particularly in the case of high pH electrolyte. In addition, a detailed carbon balance path is elucidated via a two-step procedure of CO2 reaction with OH- at the cathode/electrolyte interface and subsequent CO2 generation at the anode/electrolyte interface caused by a relatively low pH in the vicinity of the anode. Based on the proposed two-step carbon balance path, a systematic exploration of gases released in the anolyte reveals the transformation of a HCO3- or OH- catholyte to a CO32- catholyte, which was further confirmed by pH measurements. © 2020 The Royal Society of Chemistry.
语种	英语
scopus关键词	Alkalinity; Anodes; Carbon; Carbon dioxide; Cathodes; Copper; Diffusion in gases; Electrochemical electrodes; Electrolytes; Electrolytic cells; Electrolytic reduction; Flow of gases; Gases; Petroleum prospecting; Alkaline electrolytes; Electrochemical conversion; Electrode/electrolyte interfaces; Faradaic efficiencies; Gas diffusion electrodes; High current densities; Substantial reduction; Systematic exploration; Phase interfaces; carbon balance; copper; design method; diffusion; electrical method; electrochemical method; electrode; reduction
来源期刊	Energy and Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/162663
作者单位	Surface Physics and Catalysis (SurfCat) Section, Department of Physics, Technical University of Denmark, Kgs. Lyngby, 2800, Denmark; Siemens A/S, RC-DK SI, Diplomvej 378, Kgs. Lyngby, 2800, Denmark
推荐引用方式 GB/T 7714	Ma M.,Clark E.L.,Therkildsen K.T.,et al. Insights into the carbon balance for CO2 electroreduction on Cu using gas diffusion electrode reactor designs[J],2020,13(3).
APA	Ma M.,Clark E.L.,Therkildsen K.T.,Dalsgaard S.,Chorkendorff I.,&Seger B..(2020).Insights into the carbon balance for CO2 electroreduction on Cu using gas diffusion electrode reactor designs.Energy and Environmental Science,13(3).
MLA	Ma M.,et al."Insights into the carbon balance for CO2 electroreduction on Cu using gas diffusion electrode reactor designs".Energy and Environmental Science 13.3(2020).