High-pressure synthesis of CO and syngas from CO2 reduction using Ni-N-doped porous carbon electrocatalyst

Federica Proietto, Simin Li, Alessandra Loria, Xing-Ming Hu, Alessandro Galia, Marcel Ceccato, Kim Daasbjerg*, Onofrio Scialdone*

*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Abstract

Electrochemical conversion of CO2 to CO or syngas (CO/H2 mixture) is considered one of the most promising approaches to valorise waste-CO2. To develop the process on industrial scale, it would be necessary to use selective and inexpensive electrodes and to obtain high productivities with low energy consumption. In this frame, Ni-NC catalysts are considered among the most interesting ones because of their relatively low cost, high faradaic efficiency in CO (FE_CO), and high stability. However, up to now, quite low productivities were obtained as a result of low current densities achieved in aqueous electrolytes. In this work, we have evaluated the performances of a Ni-NC electrocatalyst at relatively high carbon dioxide pressures (5-30 bar) in a wide range of cell potentials and current densities. It is found that proper selection of CO2 pressure and catalyst loading improves drastically the performance of the process, obtaining high FE_CO (close to 100 %), high current densities (>100 mA cm-2), and high productivities. Furthermore, it is shown that it is possible to obtain syngas with a target ratio of two between H2 and CO under various operating conditions. As an example, syngas was obtained with FE close to 100% and a productivity of ~18 mol h-1 m-2 working at 30 bar with a current density close to 195 mA cm-2.
Original languageEnglish
Article number132251
JournalChemical Engineering Journal
Volume429
Number of pages10
ISSN1385-8947
DOIs
Publication statusPublished - Feb 2022

Keywords

  • CO
  • CO reduction
  • High pressure
  • Ni−NC electrocatalyst
  • Syngas

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