Selective ammonia production via nitrite electroreduction over CoFe layered double hydroxides-decorated 3D TiO <sub>2</sub> array
Water-soluble nitrite (NO<sub>2</sub><sup>−</sup>) in wastewater from agricultural and industrial activities poses ecological and health risks, and its electroreduction shows promise for ammonia (NH<sub>3</sub>) production, but energy losses from the hydrogen evolution reaction (HER) limit its overall efficiency. In this work, we report the use of CoFe-layered double hydroxides on 3D TiO<sub>2</sub> array (TiO<sub>2</sub>@CoFe-LDH/TP) as an effective electrocatalyst for NO<sub>2</sub><sup>−</sup> reduction. By offering superior *H species supply and hydroprocessing capability, this catalyst achieves an NH<sub>3</sub> yield of 1056.4 μmol h<sup>−1</sup> cm<sup>−2</sup> with a 97.4% Faradaic efficiency (FE) at −0.6 V and sustains FE above 87% across a range of applied potentials. Additionally, a 60-h simulated wastewater treatment experiment demonstrates its practical application potential.
Authors
- Xiaoya Fan
- Xuping Sun (ORCID: https://orcid.org/0000-0001-5034-1135)
- Xun He (ORCID: https://orcid.org/0000-0002-2525-9102)
- Dongdong Zheng (ORCID: https://orcid.org/0000-0002-7748-4811)
- Hao Chen (ORCID: https://orcid.org/0009-0001-6480-7976)
- Yi Liang (ORCID: https://orcid.org/0009-0000-9981-2196)
- Shengjun Sun (ORCID: https://orcid.org/0000-0001-6381-9548)
- Yongsong Luo (ORCID: https://orcid.org/0000-0002-0234-0477)
Publication Details
- Journal
- Nano Research
- Published
- 2025-03-04
- DOI
- https://doi.org/10.26599/nr.2025.94907344
- Citations
- 37
- Primary Topic
- Ammonia Synthesis and Nitrogen Reduction
- Type
- article
- Field-Weighted Citation Impact
- 14.39