Pairing electrochemical CO2 reduction with glycerol oxidation: Bottlenecks today, opportunities tomorrow

IF 35.4 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Joule Pub Date : 2025-09-17 DOI:10.1016/j.joule.2025.102096

Attila Kormányos , Adrienn Szirmai , Balázs Endrődi , Csaba Janáky

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Abstract

One of the greatest obstacles hampering the industrial application of CO₂ electrolysis is the large cell voltage (often over 3 V), which is mainly rooted in the high redox potential and overpotential of the oxygen evolution reaction (OER) occurring at the anode. It is possible to mitigate this issue by replacing the OER with alternative processes, such as the electrochemical oxidation of small organic molecules. Although the number of examples of paired CO₂ reduction reaction (CO₂RR)/small organic molecule oxidation is rapidly increasing, their viability has only been tested at the laboratory scale, mainly in batch cells. In this perspective, taking the glycerol oxidation reaction (GOR) as an example, the main challenges concerning the quantification of GOR products, the use of crude glycerol as a feedstock, and the integration of GOR with CO₂RR are summarized. Finally, the most important envisioned future steps for the implementation of paired CO₂RR/GOR electrolysis at scale are outlined.

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电化学CO2还原与甘油氧化相结合：今天是瓶颈，明天是机遇

阻碍二氧化碳电解工业应用的最大障碍之一是电池电压大（通常超过3v），这主要源于阳极发生的析氧反应（OER）的高氧化还原电位和过电位。可以通过替代OER的方法来缓解这一问题，例如小有机分子的电化学氧化。虽然配对CO2还原反应(CO2RR)/小有机分子氧化的例子数量正在迅速增加，但它们的生存能力仅在实验室规模上进行了测试，主要是在批式细胞中。从这个角度出发，以甘油氧化反应（GOR）为例，总结了GOR产品定量、粗甘油作为原料的使用以及GOR与CO2RR的整合等方面面临的主要挑战。最后，概述了大规模实施配对CO2RR/GOR电解的最重要设想的未来步骤。

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来源期刊

Joule Energy-General Energy

CiteScore

53.10

自引率

2.00%

发文量

198

期刊介绍： Joule is a sister journal to Cell that focuses on research, analysis, and ideas related to sustainable energy. It aims to address the global challenge of the need for more sustainable energy solutions. Joule is a forward-looking journal that bridges disciplines and scales of energy research. It connects researchers and analysts working on scientific, technical, economic, policy, and social challenges related to sustainable energy. The journal covers a wide range of energy research, from fundamental laboratory studies on energy conversion and storage to global-level analysis. Joule aims to highlight and amplify the implications, challenges, and opportunities of novel energy research for different groups in the field.