2026-07-30 ローレンス・バークレー国立研究所（LBNL）
＜関連情報＞
- https://newscenter.lbl.gov/2026/07/30/pulling-graphite-out-of-thin-air/
- https://www.nature.com/articles/s41467-026-70977-0
溶融炭酸塩CO₂から炭素への電気還元における過酸化物中間体のオペランド分光電気化学的同定 Operando spectroelectrochemical identification of peroxide intermediate in molten carbonate CO2-to-carbon electroreduction
Sander Ratso,Michael L. Whittaker,Kätlin Kaare & Raluca O. Scarlat
Nature Communications Published:21 April 2026
DOI:https://doi.org/10.1038/s41467-026-70977-0
Abstract
Electrolysis of CO2 in molten salts promises efficient carbon capture, but the underlying reaction mechanisms remain incompletely understood, as research thus far has been limited by a lack of tools for operando investigations. Here, we use a high-temperature operando Raman spectroelectrochemical system to look for signatures of reaction intermediates and study the evolution of carbon structures over electrolysis time. The analysis reveals the existence of O22− concurrently with the deposition of carbon on Au, W, Inconel, and Ni electrode materials, pointing to a common reaction mechanism with O22− as an intermediate. Secondly, the G peak of the as-deposited carbon experiences a noticeable blue-shift as the material is cooled down and purified, suggesting either a growth in crystallite size even after the electrolysis is stopped or lithium deintercalation. Elucidating the cathodic carbon deposition mechanism could help create greater value-added products and increase the economic viability of carbon capture.
