Affiliation:
1. Institute of Functional Nano & Soft Materials (FUNSOM) Soochow University Suzhou 215123 China
2. Jiangsu Key Laboratory for Advanced Negative Carbon Technologies Soochow University Suzhou 215123 China
3. Macao Institute of Materials Science and Engineering (MIMSE) MUST-SUDA Joint Research Center for Advanced Functional Materials Macau University of Science and Technology Taipa 999078, Macau SAR China
Abstract
AbstractCarbon dioxide reduction reaction (CO2RR) provides an efficient pathway to convert CO2 into desirable products, yet its commercialization is greatly hindered by the huge energy cost due to CO2 loss and regeneration. Performing CO2RR under acidic conditions containing alkali cations can potentially address the issue, but still causes (bi)carbonate deposition at high current densities, compromising product Faradaic efficiencies (FEs) in present‐day acid‐fed membrane electrode assemblies. Herein, we present a strategy using a positively charged polyelectrolyte—poly(diallyldimethylammonium) immobilized on graphene oxide via electrostatic interactions to displace alkali cations. This enables a FE of 85 %, a carbon efficiency of 93 %, and an energy efficiency (EE) of 35 % for CO at 100 mA cm−2 on modified Ag catalysts in acid. In a pure‐water‐fed reactor, we obtained a 78 % CO FE with a 30 % EE at 100 mA cm−2 at 40 °C. All the performance metrics are comparable to or even exceed those attained in the presence of alkali metal cations.
Funder
National Natural Science Foundation of China
Fundo para o Desenvolvimento das Ciências e da Tecnologia
Natural Science Foundation of Jiangsu Province
Natural Science Research of Jiangsu Higher Education Institutions of China