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Research Article | Open Access

Selective ammonia production via nitrite electroreduction over CoFe layered double hydroxides-decorated 3D TiO2 array

Yi Liang1,2, Xiaoya Fan1 ( ), Xun He2, Dongdong Zheng3, Shengjun Sun3, Yongsong Luo2, Hao Chen3( ), Xuping Sun2,4 ( )
College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China
Center for High Altitude Medicine, West China Hospital, Sichuan University, Chengdu 610041, China
Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu 610041, China
College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, China
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Abstract

Water-soluble nitrite (NO2−) in wastewater from agricultural and industrial activities poses ecological and health risks, and its electroreduction shows promise for ammonia (NH3) 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 three-dimensional (3D) TiO2 array (TiO2@CoFe-LDH) as an effective electrocatalyst for NO2− reduction. By offering superior *H species supply and hydroprocessing capability, this catalyst achieves an NH3 yield of 1056.4 μmol·h−1·cm−2 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.

Graphical Abstract

CoFe-layered double hydroxides (CoFe-LDH) on a three-dimensional (3D) TiO2 array is highly active for electrocatalytic NO2− reduction to NH3, attaining an NH3 yield of 1056.4 μmol·h−1·cm−2 with a Faradaic efficiency of 97.4%.

Keywords

CoFe-layered double hydroxides (CoFe-LDH)TiO2 arrayelectrochemical of NO2− reductionwastewater treatmentNH3 production

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Nano Research
Volume 18 Issue 4,
April 2025
Article number: 94907344
DOI: 10.26599/NR.2025.94907344

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Cite this article:
Liang Y, Fan X, He X, et al. Selective ammonia production via nitrite electroreduction over CoFe layered double hydroxides-decorated 3D TiO2 array. Nano Research, 2025, 18(4): 94907344. https://doi.org/10.26599/NR.2025.94907344
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Electrocatalysis

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Received: 16 January 2025
Revised: 28 February 2025
Accepted: 03 March 2025
Published: 02 April 2025
© The Author(s), corrected publication 2025. Published by Tsinghua University Press.

This is an open access article under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0, https://creativecommons.org/licenses/by/4.0/).