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Selective Nitrate Electroreduction to Ammonia on CNT Electrodes with Controllable Interfacial Wettability.
Liu, Yanbiao; Zheng, Yiqing; Ren, Yifan; Wang, Ying; You, Shijie; Liu, Meng.
Afiliación
  • Liu Y; Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), Dalian POCT Laboratory, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China.
  • Zheng Y; College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China.
  • Ren Y; College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China.
  • Wang Y; College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China.
  • You S; State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
  • Liu M; Shanghai Institute of Pollution Control and Ecological Security, 1239 Siping Road, Shanghai 200092, China.
Environ Sci Technol ; 58(16): 7228-7236, 2024 Apr 23.
Article en En | MEDLINE | ID: mdl-38551367
ABSTRACT
The development of electrocatalysts that can efficiently reduce nitrate (NO3-) to ammonia (NH3) has garnered increasing attention due to their potential to reduce carbon emissions and promote environmental protection. Intensive efforts have focused on catalyst development, but a thorough understanding of the effect of the microenvironment around the reactive sites of the catalyst is also crucial to maximize the performance of the electrocatalysts. This study explored an electrocatalytic system that utilized quaternary ammonium surfactants with a range of alkyl chain lengths to modify an electrode made of carbon nanotubes (CNT), with the goal of regulating interfacial wettability toward NO3- reduction. Trimethyltetradecylammonium bromide with a moderate alkyl chain length created a very hydrophobic interface, which led to a high selectivity in the production of NH3 (∼87%). Detailed mechanistic investigations that used operando Fourier-transform infrared (FTIR) spectroscopy and online differential electrochemical mass spectrometry (DEMS) revealed that the construction of a hydrophobic modified CNT played a synergistic role in suppressing a side reaction involving the generation of hydrogen, which would compete with the reduction of NO3-. This electrocatalytic system led to a favorable process for the reduction of NO3- to NH3 through a direct electron transfer pathway. Our findings underscore the significance of controlling the hydrophobic surface of electrocatalysts as an effective means to enhance electrochemical performance in aqueous media.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Humectabilidad / Nanotubos de Carbono / Electrodos / Amoníaco / Nitratos Idioma: En Revista: Environ Sci Technol Año: 2024 Tipo del documento: Article País de afiliación: China Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Humectabilidad / Nanotubos de Carbono / Electrodos / Amoníaco / Nitratos Idioma: En Revista: Environ Sci Technol Año: 2024 Tipo del documento: Article País de afiliación: China Pais de publicación: Estados Unidos