CO2 Electroreduction to Methane at Production Rates Exceeding 100 mA/cm2,ACS Sustainable Chemistry & Engineering

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CO2 Electroreduction to Methane at Production Rates Exceeding 100 mA/cm2
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-09-14 , DOI: 10.1021/acssuschemeng.0c03453
Armin Sedighian Rasouli ₁ , Xue Wang ₁ , Joshua Wicks ₁ , Geonhui Lee ₁ , Tao Peng ₁ , Fengwang Li ₁ , Christopher McCallum ₂ , Cao-Thang Dinh _{1,

3} , Alexander H. Ip ₁ , David Sinton ₂ , Edward H. Sargent ₁

Affiliation

The electrochemical reduction of CO₂ to methane is a promising method to store intermittent renewable energy. Previous research reporting high methane selectivity has relied on H-cells, and total current densities have therefore resided below 50 mA/cm², insufficient for industrial applications. Here, we increase the methane production rate by modifying the system so that it functions efficiently in a flow cell configuration. We investigate the impact of the local environment on methane selectivity in flow cells by tuning the choice of electrolyte cation, catalyst thickness, and local pH. We achieve a methane selectivity of 48% ± 4% with a partial current density of 120 ± 10 mA/cm², representing a cathodic energy efficiency of 23%. We showcase a stable operation for 14 h.

中文翻译：

以超过100 mA / cm ^2的生产率将CO ₂电还原为甲烷

CO ₂电化学还原为甲烷是一种存储间歇性可再生能源的有前途的方法。以前的研究表明，高甲烷选择性取决于H电池，因此总电流密度低于50 mA / cm ²，不足以用于工业应用。在这里，我们通过修改系统来提高甲烷生产率，使其在流通池配置中有效发挥作用。我们通过调整电解质阳离子，催化剂厚度和局部pH的选择来研究局部环境对流通池中甲烷选择性的影响。我们的甲烷选择性为48％±4％，部分电流密度为120±10 mA / cm ²，表示阴极能效为23％。我们展示了14小时的稳定运行。

更新日期：2020-10-05

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