Liquid-Solid Boundaries Dominate Activity of CO2Reduction on Gas-Diffusion Electrodes
| Autor: | Divya Bohra, Nathan T. Nesbitt, Thomas Burdyny, Wilson A. Smith, Recep Kas, Danielle A. Salvatore, Hunter Simonson |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
chemistry.chemical_element 010402 general chemistry Electrochemistry 01 natural sciences Catalysis gas-diffusion electrode law.invention double-phase boundary triple-phase boundary law COreduction Gaseous diffusion chemistry.chemical_classification Electrolysis Gas diffusion electrode 010405 organic chemistry General Chemistry COelectrolysis 0104 chemical sciences Hydrocarbon chemistry Chemical engineering Electrode Triple phase boundary Carbon |
| Zdroj: | ACS Catalysis, 10(23) |
| ISSN: | 2155-5435 |
| Popis: | Electrochemical CO2 electrolysis to produce hydrocarbon fuels or material feedstocks offers a renewable alternative to fossilized carbon sources. Gas-diffusion electrodes (GDEs), composed of solid electrocatalysts on porous supports positioned near the interface of a conducting electrolyte and CO2 gas, have been able to demonstrate the substantial current densities needed for future commercialization. These higher reaction rates have often been ascribed to the presence of a three-phase interface, where solid, liquid, and gas provide electrons, water, and CO2, respectively. Conversely, mechanistic work on electrochemical reactions implicates a fully two-phase reaction interface, where gas molecules reach the electrocatalyst's surface by dissolution and diffusion through the electrolyte. Because the discrepancy between an atomistic three-phase versus two-phase reaction has substantial implications for the design of catalysts, gas-diffusion layers, and cell architectures, the nuances of nomenclatures and governing phenomena surrounding the three-phase-region require clarification. Here we outline the macro, micro, and atomistic phenomena occurring within a gas-diffusion electrode to provide a focused discussion on the architecture of the often-discussed three-phase region for CO2 electrolysis. From this information, we comment on the outlook for the broader CO2 electroreduction GDE cell architecture. |
| Databáze: | OpenAIRE |
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