Techno-economic assessment of low-temperature carbon dioxide electrolysis
Techno-economic assessment of low-temperature carbon dioxide electrolysis
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DOI：
10.1038/s41893-021-00739-x
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发表时间：
2021-07-12
影响因子：
27.6
通讯作者：
Jiao, Feng
中科院分区：
文献类型：
--
作者：
Shin, Haeun;Hansen, Kentaro U.;Jiao, Feng
低温二氧化碳电解是生产可再生化学品和燃料的一种潜在的使能过程，尤其是一氧化碳、甲酸、乙烯和乙醇。由于这项技术近年来发展迅速，因此有必要进行系统的技术经济评估，以评估其作为二氧化碳利用方法的可行性。这项工作对四种主要产品进行了全面的技术经济评估，并以系统的指导方针确定了技术开发的优先顺序，以促进低温二氧化碳电解的市场部署。首先，我们调查了最先进的电解槽性能，并对优值系数进行了参数化。分析表明，一氧化碳和甲酸(C-1产品)的生产成本分别接近0.44美元和0.59公斤(-1)，与传统工艺相比具有竞争力。相比之下，生产乙烯和乙醇(C-2产品)并不立即可行，因为它们的成本分别高得多，分别为2.50美元和2.06千克(-1)。然后，我们提供了使C2产品生产在经济上可行的详细路线图：将能源效率提高到接近50%，并将电价降低到0.01kWh(-1)。我们还提出了与行业相关的基准：电解槽组件的5年稳定性和C-1和C-2产品的单程转化率分别为30%和15%。最后，我们讨论了利用阴离子交换膜或双极膜解决电解液中和问题的两种潜在策略的经济方面。
Low-temperature CO2 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 CO2 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 CO2 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 similar to 50% and a reduction in electricity price to US$0.01kWh(-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.