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Updated: Jan 16, 2026

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
Published on: April 10, 2018
Proton-Tuned Surface Chemistry Promotes Multicarbon Formation in Acidic CO2 Electroreduction
Qingqing Song1, Feng Li2, Aoni Xu3
1Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi, Jiangsu 214122, P. R. China.
Abstract:
Carbon dioxide electroreduction to multicarbon (C2+) products in strongly acidic media offers a promising approach to mitigate carbon loss observed in alkaline and neutral electrolytes. However, achieving high C2+ selectivity at energy-efficient current densities remains challenging due to competing one-carbon (C1) product generation. Here, we report a proton-availability-promoted C2+ production in acidic CO2 electroreduction within a moderate current density regime. We demonstrated a remarkably enhanced C2+ production─C2+ faradaic efficiency increasing from 23.9 ± 2.7% to 48.1 ± 0.6% and C2+/C1 ratio from 0.4 to 1.6─by increasing the proton concentration from pH 2 to pH 1 in the bulk acidic electrolyte. Our in situ Raman spectroscopy and simulation studies revealed that higher proton concentration enhances *CO coverage and favors a low-frequency *CO binding configuration on copper surface, thereby facilitating C-C coupling and promoting C2+ product formation.
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