ACS_Energy Letters_Cover Picture
September 11, 2020
Volume 5, Issue 9
Pages 2787-3100
Electric Field Mediated Selectivity Switching of Electrochemical CO2 Reduction from Formate to CO on Carbon Supported Sn
Decades of electrochemical CO2 reduction research have led to established rules about the product selectivity, i.e., bare tin yields formic acid as the main product. Here, we present Sn nanoparticles supported on carbon nanotubes (CNTs) in a hollow fiber (Sn-CHF), which produce CO with 10 times higher selectivity than formate. Density functional theory calculations reveal that a strong interfacial field induced by the carbon support enhances the rate-limiting CO2 adsorption and thus CO production on Sn nanoparticles, whereas the field-insensitive formate and hydrogen production routes were completely suppressed and occurred mainly from carbon sites. Modification of the interfacial electric field via exchange of the electrolyte-containing cation from Li+ to Cs+ induces an unprecedented 2 orders of magnitude change in the CO current while keeping the other products almost unchanged. This work demonstrates how electrochemical selectivity rules can be modulated by controlling the interfacial field, thus opening up new windows for electrocatalyst design.
- Mi-Young Lee
- Hyungjun Kim
Seoktae Kang
Youngkook Kwon
https://pubs.acs.org/toc/aelccp/5/9
Image created by minjeong Kim / Nanosphere
ACS_Energy Letters_Cover Picture
September 11, 2020
Volume 5, Issue 9
Pages 2787-3100
Electric Field Mediated Selectivity Switching of Electrochemical CO2 Reduction from Formate to CO on Carbon Supported Sn
Decades of electrochemical CO2 reduction research have led to established rules about the product selectivity, i.e., bare tin yields formic acid as the main product. Here, we present Sn nanoparticles supported on carbon nanotubes (CNTs) in a hollow fiber (Sn-CHF), which produce CO with 10 times higher selectivity than formate. Density functional theory calculations reveal that a strong interfacial field induced by the carbon support enhances the rate-limiting CO2 adsorption and thus CO production on Sn nanoparticles, whereas the field-insensitive formate and hydrogen production routes were completely suppressed and occurred mainly from carbon sites. Modification of the interfacial electric field via exchange of the electrolyte-containing cation from Li+ to Cs+ induces an unprecedented 2 orders of magnitude change in the CO current while keeping the other products almost unchanged. This work demonstrates how electrochemical selectivity rules can be modulated by controlling the interfacial field, thus opening up new windows for electrocatalyst design.
Seoktae Kang
Youngkook Kwon
https://pubs.acs.org/toc/aelccp/5/9
Image created by minjeong Kim / Nanosphere