Electrochemical Natural Gas Conversion to More Valuable Species
| Autor: | Ronald L. Cook, Daniel J. Kuchynka, Anthony F. Sammells |
|---|---|
| Rok vydání: | 1991 |
| Předmět: |
Oxide minerals
Renewable Energy Sustainability and the Environment Chemistry Non-blocking I/O Inorganic chemistry Binding energy Oxide Condensed Matter Physics Electrochemistry Electrocatalyst Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound Crystallography Materials Chemistry Oxygen binding Perovskite (structure) |
| Zdroj: | Journal of The Electrochemical Society. 138:1284-1299 |
| ISSN: | 1945-7111 0013-4651 |
| Popis: | This paper reports on the electrochemical oxidative dimerization of methane to give C{sub 2} hydrocarbon species investigated in solid oxide fuel cells possessing the general configuration: CH{sub 4}, anode electrocatalyst/ZrO{sub 2}(8 m/o Y{sub 2}O{sub 3})/La{sub 0.9}Sr{sub 0.1}MnO{sub 3}O{sub 2}(air). Perovskite anode electrocatalysts shown to possess activity toward promoting the subject reaction include Sm{sub 0.5}Ce{sub 0.5}CuO{sub 3}, Tb{sub 0.8}Sm{sub 0.2}CuO{sub 3}, Gd{sub 0.9}Th{sub 0.1}CuO{sub 3}, Gd{sub 0.9}Na{sub 0.1}MnO{sub 3}, and Th{sub 0.8}Yb{sub 0.2}NiO{sub 3}. Maximum partial faradaic current densities at active perovskite anode electrocatalysts for promoting the subject reaction were found to be directly correlatable to their calculated oxygen binding energies on the perovskite surface, where increasing binding energies were found to favor higher rates for electrochemical partial methane oxidation. Increasing surface oxygen binding energies at perovskite anode electrocatalysts were found to correlate with increasing perovskite lattice-free volumes with electrochemical measurements, supporting increasing surface oxygen binding energies and perovskite lattice-free volumes as leading to enhanced rates for the subject reaction. As a consequence, synergism was found between experimentally determined perovskite anode electrocatalyst activities, their calculated surface oxygen binding energies, and lattice ionic-free volumes. |
| Databáze: | OpenAIRE |
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