Combined high alkalinity and pressurization enable efficient CO2 electroreduction to CO†,Energy & Environmental Science

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Combined high alkalinity and pressurization enable efficient CO2 electroreduction to CO†
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2018-06-21 00:00:00 , DOI: 10.1039/c8ee01684d
Christine M. Gabardo _{1,

2,

3,

4} , Ali Seifitokaldani _{2,

3,

4,

5} , Jonathan P. Edwards _{1,

2,

3,

4} , Cao-Thang Dinh _{2,

3,

4,

5} , Thomas Burdyny _{1,

2,

3,

4} , Md Golam Kibria _{2,

3,

4,

5} , Colin P. O’Brien _{1,

2,

3,

4} , Edward H. Sargent _{2,

3,

4,

5} , David Sinton _{1,

2,

3,

4}

Affiliation

The electroreduction of carbon dioxide (CO₂) to carbon monoxide (CO) is a promising strategy to utilize CO₂ emissions while generating a high value product. Commercial CO₂ electroreduction systems will require high current densities (>100 mA cm⁻²) as well as improved energetic efficiencies (EEs), achieved via high CO selectivity and lowered applied potentials. Here we report a silver (Ag)-based system that exhibits the lowest overpotential among CO₂-to-CO electrolyzers operating at high current densities, 300 mV at 300 mA cm⁻², with near unity selectivity. We achieve these improvements in voltage efficiency and selectivity via operation in a highly alkaline reaction environment (which decreases overpotentials) and system pressurization (which suppresses the generation of alternative CO₂ reduction products), respectively. In addition, we report a new record for the highest half-cell EE (>80%) for CO production at 300 mA cm⁻².

中文翻译：

高碱度和加压相结合，可将CO ₂有效地电还原为CO †

将二氧化碳（CO ₂）电还原为一氧化碳（CO）是一种有前途的策略，既可以利用CO ₂排放，又可以产生高价值的产品。商业CO ₂电解还原系统将需要高电流密度（> 100 mA cm ^-2）以及通过高CO选择性和降低的施加电势来实现的高能效（EEs）。在这里，我们报道了一种基于银（Ag）的系统，该系统在高电流密度，300 mA cm ^-2下的300 mV和接近单位选择性的情况下，在CO ₂至CO电解槽中表现出最低的过电势。我们实现电压效率和选择性这些改进通过分别在高碱性反应环境（降低过电势）和系统加压（抑制替代的CO ₂还原产物）中进行操作。此外，我们报告了在300 mA cm ^-2的条件下产生CO的最高半电池EE（> 80％）的新记录。

更新日期：2018-06-21

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