Rutile-Type Co<sub>0.5</sub>Ti<sub>0.5</sub>NbO<sub>4</sub>-Based Cathode with In Situ Exsolved Metal Particles for Direct CO<sub>2</sub> Electrolysis
Rutile-type Co<sub>0.5</sub>Ti<sub>0.5</sub>NbO<sub>4</sub> (CTO)-based materials doped with Fe<sup>3+</sup> or Ni<sup>2+</sup> were investigated as cathode electrodes to modify their electrical conductivity and electrocatalysis toward CO<sub>2</sub> splitting. Higher electric conductivity was found in Co<sub>0.4</sub>Fe<sub>0.2</sub>Ti<sub>0.4</sub>NbO<sub>4</sub> (CTO-Fe, 0.78 S cm<sup>-1</sup>) and Co<sub>0.25</sub>Ni<sub>0.25</sub>Ti<sub>0.5</sub>NbO<sub>4</sub> (CTO-Ni, 2.10 S cm<sup>-1</sup>) compared to CTO (0.49 S cm<sup>-1</sup>) after the reduction at 800 °C in Ar-5% H<sub>2</sub>. Co and Co-Ni particles exsolved in situ from the surface of CTO, CTO-Fe, and CTO-Ni after reduction. CTO-Ni and CTO-Fe cathodes did better in the CO<sub>2</sub> electrolysis at 800 °C than the CTO one, but the CTO-Ni cell was unstable after 10 h of operation due to the carbon deposition that blocked the electrode. The cell with CTO-Fe demonstrated a good stability for CO<sub>2</sub> splitting in 100 h. This work demonstrates that rutile-type CTO-based cathodes are promising to provide an efficient and candidate oxide cathode for the electrolysis of CO<sub>2</sub>.
Authors
- Xiaojing Liu (ORCID: https://orcid.org/0000-0002-8462-3576)
- Wenji Ruan
- Jiupai Ni (ORCID: https://orcid.org/0000-0002-5245-2952)
- Chengsheng Ni (ORCID: https://orcid.org/0000-0002-7184-1654)
Institutions
- Southwest University (CN)
Publication Details
- Journal
- ACS Applied Materials & Interfaces
- Published
- 2024-08-23
- DOI
- https://doi.org/10.1021/acsami.4c11593
- Primary Topic
- Advancements in Solid Oxide Fuel Cells
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- National Natural Science Foundation of China