Another role of CO-formation catalyst in acidic tandem CO2 electroreduction: Local pH modulator

Li，Fu Zhi1; Qin，Hai Gang1; Zhang，Huan Lei2; Yue，Xian1; Fu，Lin Ke3; Xu，Bingjun3; Lin，Meng2; Gu，Jun1

2024-06-19

10.1016/j.joule.2024.03.011

Joule   影响因子和分区

2542-4351

Electrochemical CO reduction on Cu-based catalysts is a promising technique to convert CO to high-value C and C feedstocks. High carbon efficiency can be achieved in acidic electrolytes, but Cu-based catalysts show suppressed activity toward C formation in acidic conditions. Acid removes the oxygen-containing species on Cu, which are necessary for C–C coupling. In this work, a gas diffusion electrode (GDE)/Cu/Ni-N-C tandem configuration, in which Ni-N-C served as a CO-to-CO catalyst, expressed a 5-time enhancement of C formation activity compared with GDE/Cu. Electrochemical measurements and finite element simulations indicate the improved C formation activity was due to the elevated local pH rather than the increased CO concentration in the Cu catalyst layer. The major function of the CO-formation catalyst in the tandem system working in an acidic condition is to modulate the local pH near the Cu catalyst instead of producing CO intermediate for Cu.

acidic electrolyte C2+ products CO2 reduction in-situ spectra oxygen-containing species pH effect tandem catalyst

SCI ; EI

英语

第一 ; 通讯

2-s2.0-85191333839

Scopus

1.Department of Chemistry,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China
2.SUSTech Energy Institute for Carbon Neutrality,Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China
3.College of Chemistry and Molecular Engineering,Peking University,Beijing,100871,China

Li，Fu Zhi,Qin，Hai Gang,Zhang，Huan Lei,et al. Another role of CO-formation catalyst in acidic tandem CO2 electroreduction: Local pH modulator[J]. Joule,2024,8(6):1772-1789.

Li，Fu Zhi.,Qin，Hai Gang.,Zhang，Huan Lei.,Yue，Xian.,Fu，Lin Ke.,...&Gu，Jun.(2024).Another role of CO-formation catalyst in acidic tandem CO2 electroreduction: Local pH modulator.Joule,8(6),1772-1789.

Li，Fu Zhi,et al."Another role of CO-formation catalyst in acidic tandem CO2 electroreduction: Local pH modulator".Joule 8.6(2024):1772-1789.