Nitrate Reduction by NiFe-LDH/CeO 2 : Understanding the Synergistic Effect between Dual-Metal Sites and Dual Adsorption

• Published in: Inorganic chemistry
• Main Authors: Liu, Lijing, Jia, Kangkang, Su, Wenyang, Zhao, Huaiquan, Huang, Zhenzhen, Wang, Guanhua, Fan, Weiqiang, Zhang, Rongxian, Bai, Hongye
• Format: Journal Article
• Language: English
• Published: United States 22-01-2024
• ISSN: 0020-1669; 1520-510X
• DOI: 10.1021/acs.inorgchem.3c04266

Electrocatalytic nitrate reduction reaction (EC-NITRR) shows a significant advantage for green reuse of the nitrate (NO
) pollutant. However, the slow diffusion reaction limits the reaction rate in practical EC-NITRR, causing an unsatisfactory ammonia (NH
) yield. In this work, a multifunctional NiFe-LDH/CeO
with the dual adsorption effect (physisorption and chemisorption) and dual-metal sites (Ce
and Fe
) was fabricated by the electrodeposition method. NiFe-LDH/CeO
performed an expected ability of enrichment for NO
through the pseudo-first-order and pseudo-second-order kinetic models, and the polymetallic structure provided abundant sites for effective reaction of NO
. At-0.6 V vs RHE, the ammonia (NH
) yield of NiFe-LDH/CeO
reached 335.3 μg h
cm
and the selectivity of NH
was 24.2 times that of NO
. The nitrogen source of NH
was confirmed by
NO
isotopic labeling. Therefore, this work achieved the recycling of the NO
pollutant by synergy of enrichment and catalysis, providing an alternative approach for the recovery of NO
from wastewater.