Tackling the proton limit under industrial electrochemical CO2 reduction by a local proton shuttle
Tianye Shao,
Kang Yang,
Sheng Chen,
Min Zheng,
Ying Zhang,
Qiang Li,
Jingjing Duan
Affiliations
Tianye Shao
MIIT Key Laboratory of Thermal Control of Electronic Equipment, School of Energy and Power Engineering, School of Chemistry and Chemical Engineering Nanjing University of Science and Technology Nanjing China
Kang Yang
MIIT Key Laboratory of Thermal Control of Electronic Equipment, School of Energy and Power Engineering, School of Chemistry and Chemical Engineering Nanjing University of Science and Technology Nanjing China
Sheng Chen
MIIT Key Laboratory of Thermal Control of Electronic Equipment, School of Energy and Power Engineering, School of Chemistry and Chemical Engineering Nanjing University of Science and Technology Nanjing China
Min Zheng
School of Chemical Engineering and Advanced Materials The University of Adelaide Adelaide South Australia Australia
Ying Zhang
MIIT Key Laboratory of Thermal Control of Electronic Equipment, School of Energy and Power Engineering, School of Chemistry and Chemical Engineering Nanjing University of Science and Technology Nanjing China
Qiang Li
MIIT Key Laboratory of Thermal Control of Electronic Equipment, School of Energy and Power Engineering, School of Chemistry and Chemical Engineering Nanjing University of Science and Technology Nanjing China
Jingjing Duan
MIIT Key Laboratory of Thermal Control of Electronic Equipment, School of Energy and Power Engineering, School of Chemistry and Chemical Engineering Nanjing University of Science and Technology Nanjing China
Abstract Industrial CO2 electroreduction has received tremendous attentions for resolution of the current energy and environmental crisis, but its performance is greatly limited by mass transport at high current density. In this work, an ion‐polymer‐modified gas‐diffusion electrode is used to tackle this proton limit. It is found that gas diffusion electrode‐Nafion shows an impressive performance of 75.2% Faradaic efficiency in multicarbon products at an industrial current density of 1.16 A/cm2. Significantly, in‐depth electrochemical characterizations combined with in situ Raman have been used to determine the full workflow of protons, and it is found that HCO3− acts as a proton pool near the reaction environment, and HCO3− and H3O+ are local proton donors that interact with the proton shuttle −SO3− from Nafion. With rich proton hopping sites that decrease the activation energy, a “Grotthuss” mechanism for proton transport in the above system has been identified rather than the “Vehicle” mechanism with a higher energy barrier. Therefore, this work could be very useful in terms of the achievement of industrial CO2 reduction fundamentally and practically.
