| Autor: |
Matsuda, Shofu, Osawa, Masatoshi, Umeda, Minoru |
| Zdroj: |
Electrocatalysis; Jul2024, Vol. 15 Issue 4, p318-328, 11p |
| Abstrakt: |
CO2 reduction and fixation are one of the most interesting topics in the fields of environmental electrochemistry and electrocatalysis. Many studies on CO2 electroreduction using various metal electrodes have been reported. However, this reaction requires a high overpotential in general, which lowers the energy conversion efficiency and prevents its practical applications to reduce CO2 emission to the atmosphere. The use of a membrane electrode assembly (MEA) is expected to be a breakthrough for the CO2 electroreduction. Particularly, methanation (converting CO2 into CH4) with MEAs incorporating Cu-based catalysts attracts special attention as a tool for carbon cycling, thanks to high faradaic efficiencies and relatively high energy conversion efficiencies. Different from Cu, Pt has long been recognized as an inactive catalyst for CO2 reduction. Contrary to the common consensus, MEAs incorporating a Pt-based electrocatalyst were found very recently to be as active as Cu-based catalysts toward methanation under specific reaction conditions. The high activity of Pt arises from a reaction mechanism different from that for Cu; most likely the Langmuir–Hinshelwood mechanism for Pt and the Eley–Rideal mechanism for Cu. This mini-review discusses CO2 electrochemical methanation using MEAs as a potential method for carbon capture. The CO2 reduction to CH4 using a H2-CO2 fuel cell is also presented. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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