Upcycling air pollutants to fuels and chemicals via electrochemical reduction technology

Angga Hermawan, Tahta Amrillah, Vani Novita Alviani, Jarot Raharjo, Zhi Wei Seh, Noriyoshi Tsuchiya

Research output: Contribution to journalReview articlepeer-review

5 Citations (Scopus)

Abstract

The intensification of fossil fuel usage results in significant air pollution levels. Efforts have been put into developing efficient technologies capable of converting air pollution into valuable products, including fuels and valuable chemicals (e.g., CO2 to hydrocarbon and syngas and NOx to ammonia). Among the strategic efforts to mitigate the excessive concentration of CO2 and NOx pollutants in the atmosphere, the electrochemical reduction technology of CO2 (CO2RR) and NOx (NOxRR) emerges as one of the most promising approaches. It is even more attractive if CO2RR and NOxRR are paired with renewables to store intermittent electricity in the form of chemical feedstocks. This review provides an overview of the electrochemical reduction process to convert CO2 to C1 and/or C2+ chemicals and NOx to ammonia (NH3) with a focus on electrocatalysts, electrolytes, electrolyzer, and catalytic reactor designs toward highly selective electrochemical conversion of the desired products. While the attempts in these aspects are enormous, economic consideration and environmental feasibility for actual implementation are not comprehensively provided. We discuss CO2RR and NOxRR from the life cycle and techno-economic analyses to perceive the feasibility of the current achievements. The remaining challenges associated with the industrial implementation of electrochemical CO2 and NOx reduction are additionally provided.

Original languageEnglish
Article number117477
JournalJournal of Environmental Management
Volume334
DOIs
Publication statusPublished - 15 May 2023

Keywords

  • Air pollutions
  • Electrocatalysis
  • Life cycle assessment
  • Sustainability
  • Techno-economic analysis
  • Waste-to-chemicals

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