• DOI:10.1038/s41893-021-00739-x
• Corpus ID: 235801320

Techno-economic assessment of low-temperature carbon dioxide electrolysis

@article{Shin2021TechnoeconomicAO,
  title={Techno-economic assessment of low-temperature carbon dioxide electrolysis},
  author={Haeun Shin and Kentaro U. Hansen and Feng Jiao},
  journal={Nature Sustainability},
  year={2021},
  volume={4},
  pages={911-919}
}

• Haeun Shin, K. U. Hansen, F. Jiao
• Published 12 July 2021
• Engineering
• Nature Sustainability

Low-temperature CO 2 electrolysis represents a potential enabling process in the production of renewable chemicals and fuels, notably carbon monoxide, formic acid, ethylene and ethanol. Because this technology has progressed rapidly in recent years, a systematic techno-economic assessment has become necessary to evaluate its feasibility as a CO 2 utilization approach. Here this work provides a comprehensive techno-economic assessment of four major products and prioritizes the technological development with systematic guidelines to facilitate the market deployment of low-temperature CO 2 electrolysis. First, we survey state-of-the-art electrolyser performance and parameterize figures of merit. The analysis shows that production costs of carbon monoxide and formic acid (C 1 products) are approaching US$0.44 and 0.59 kg –1 , respectively, competitive with conventional processes. In comparison, the production of ethylene and ethanol (C 2 products) is not immediately feasible due to their substantially higher costs of US$2.50 and 2.06 kg –1 , respectively. We then provide a detailed roadmap to making C 2 product production economically viable: an improvement in energetic efficiency to ~50% and a reduction in electricity price to US$0.01 kWh –1 . We also propose industrially relevant benchmarks: 5-year stability of electrolyser components and the single-pass conversion of 30 and 15% for C 1 and C 2 products, respectively. Finally we discuss the economic aspects of two potential strategies to address electrolyte neutralization utilizing either an anion exchange membrane or bipolar membrane. Low-temperature CO 2 electrolysis is a promising process for producing renewable chemicals and fuels. This work provides a systematic techno-economic assessment of four major products, prioritizing technological development, and proposes guidelines to facilitate market adoption.