Highly selective electrochemical nitrate reduction using copper phosphide self-supported copper foam electrode: Performance, mechanism, and application

Yao, Fubing; Jia, Maocong; Yang, Qi; Chen, Fei; Zhong, Yu; Chen, Shengjie; He, Li; Pi, Zhoujie; Hou, Kunjie; Wang, Dongbo; Li, Xiaoming

doi:10.1016/j.watres.2021.116881

Cited by 162 publications

(67 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The additional small peaks at 934.8 and 954.2 eV correspond to the 2p 1/2 and 2p 3/2 peaks of Cu 2+ (Figure 2c), resulting from the superficial oxidation of Cu or Cu + during the preparation and analysis process. [ 45 ] The above results indicate a strong metal‐support interaction (SMSI) between the Cu nanoparticles and the OV‐TiO 2 . The SMSI effect may lead to the electron transfer from the Cu metal to the OV‐TiO 2 support, [ 46,47 ] decreasing the electron density in the Cu species.…”

Section: Resultsmentioning

confidence: 87%

Modulating the Active Sites of Oxygen‐Deficient TiO₂ by Copper Loading for Enhanced Electrocatalytic Nitrogen Reduction to Ammonia

Utomo

2022

Small

View full text Add to dashboard Cite

The electrocatalytic nitrogen reduction reaction (NRR) provides a sustainable route for NH3 synthesis. However, the process is plagued by the strong NN triple bond and high reaction barrier. Modification of catalyst surface to increase N2 adsorption and activation is crucial. Herein, copper nanoparticles are loaded on the oxygen‐deficient TiO2, which exhibits an enhanced NRR performance with NH3 yield of 13.6 µg mgcat−1 h−1 at −0.5 V versus reversible hydrogen electrode (RHE) and Faradaic efficiency of 17.9% at −0.4 V versus RHE compared to the pristine TiO2. The enhanced performance is ascribed to the higher electrochemically active surface area, promoted electron transfer, and increased electron density originated from the strong metal‐support interaction (SMSI) between Cu nanoparticles and oxygen‐deficient TiO2. The SMSI effect also results in lopsided local charge distribution, which polarizes the adsorbed N2 molecules for better activation. This work provides a facile strategy toward the electrocatalyst design for efficient NRR under ambient conditions.

show abstract

Section: Resultsmentioning

confidence: 87%

Modulating the Active Sites of Oxygen‐Deficient TiO₂ by Copper Loading for Enhanced Electrocatalytic Nitrogen Reduction to Ammonia

Utomo

2022

Small

View full text Add to dashboard Cite

show abstract

“…Nitrate contamination in water poses a significant health threat due to its toxicity and potential carcinogenicity. − Among various nitrate removal techniques, the electrochemical nitrate reduction process is one of the most promising approaches for ground water and micropolluted surface water purification, owing to minimum chemical input, no concentrated brine discharge, and mild operation conditions. − Indirect electrochemical nitrate reduction mediated by atomic hydrogen (H*) is more effective and energy-efficient than direct electron transfer, which usually requires high overpotential. − …”

Section: Introductionmentioning

confidence: 99%

On-Demand Atomic Hydrogen Provision by Exposing Electron-Rich Cobalt Sites in an Open-Framework Structure toward Superior Electrocatalytic Nitrate Conversion to Dinitrogen

Chen

Zhang

et al. 2021

Environ. Sci. Technol.

View full text Add to dashboard Cite

Electrocatalytic nitrate (NO3 –) reduction to N2 via atomic hydrogen (H*) is a promising approach for advanced water treatment. However, the reduction rate and N2 selectivity are hindered by slow mass transfer and H* provision–utilization mismatch, respectively. Herein, we report an open-framework cathode bearing electron-rich Co sites with extraordinary H* provision performance, which was validated by electron spin resonance (ESR) and cyclic voltammetry (CV) tests. Benefiting from its abundant channels, NO3 – has a greater opportunity to be efficiently transferred to the vicinity of the Co active sites. Owing to the enhanced mass transfer and on-demand H* provision, the nitrate removal efficiency and N2 selectivity of the proposed cathode were 100 and 97.89%, respectively, superior to those of noble metal-based electrodes. In addition, in situ differential electrochemical mass spectrometry (DEMS) indicated that ultrafast *NO2 – to *NO reduction and highly selective *NO to *N2O or *N transformation played crucial roles during the NO3 – reduction process. Moreover, the proposed electrochemical system can achieve remarkable N2 selectivity without the additional Cl– supply, thus avoiding the formation of chlorinated byproducts, which are usually observed in conventional electrochemical nitrate reduction processes. Environmentally, energy conservation and negligible byproduct release ensure its practicability for use in nitrate remediation.

show abstract

“…The long-term stability of catalysts is a vital parameter for evaluating ENRR performance. 41 Fig. 7a shows that the Co@NCNT/CC cathode preserved excellent catalytic activity toward ENRR over 30 consecutive cycles, with a removal proportion of around 95% and an N 2 selectivity (in the presence of NaCl) of 100% for each cycle.…”

Section: Long-term Stability Of Co@ncnt/cc and Enrr Tests With The Re...mentioning

confidence: 98%

Metal-encapsulated carbon nanotube arrays for enhancing electrocatalytic nitrate reduction in wastewater: importance of lying-down to standing-up structure transition

Chen

Duan

et al. 2022

Environ. Sci.: Nano

View full text Add to dashboard Cite

show abstract

Highly selective electrochemical nitrate reduction using copper phosphide self-supported copper foam electrode: Performance, mechanism, and application

Cited by 162 publications

References 49 publications

Modulating the Active Sites of Oxygen‐Deficient TiO₂ by Copper Loading for Enhanced Electrocatalytic Nitrogen Reduction to Ammonia

Modulating the Active Sites of Oxygen‐Deficient TiO₂ by Copper Loading for Enhanced Electrocatalytic Nitrogen Reduction to Ammonia

On-Demand Atomic Hydrogen Provision by Exposing Electron-Rich Cobalt Sites in an Open-Framework Structure toward Superior Electrocatalytic Nitrate Conversion to Dinitrogen

Metal-encapsulated carbon nanotube arrays for enhancing electrocatalytic nitrate reduction in wastewater: importance of lying-down to standing-up structure transition

Contact Info

Product

Resources

About

Highly selective electrochemical nitrate reduction using copper phosphide self-supported copper foam electrode: Performance, mechanism, and application

Cited by 162 publications

References 49 publications

Modulating the Active Sites of Oxygen‐Deficient TiO2 by Copper Loading for Enhanced Electrocatalytic Nitrogen Reduction to Ammonia

Modulating the Active Sites of Oxygen‐Deficient TiO2 by Copper Loading for Enhanced Electrocatalytic Nitrogen Reduction to Ammonia

On-Demand Atomic Hydrogen Provision by Exposing Electron-Rich Cobalt Sites in an Open-Framework Structure toward Superior Electrocatalytic Nitrate Conversion to Dinitrogen

Metal-encapsulated carbon nanotube arrays for enhancing electrocatalytic nitrate reduction in wastewater: importance of lying-down to standing-up structure transition

Contact Info

Product

Resources

About

Modulating the Active Sites of Oxygen‐Deficient TiO₂ by Copper Loading for Enhanced Electrocatalytic Nitrogen Reduction to Ammonia

Modulating the Active Sites of Oxygen‐Deficient TiO₂ by Copper Loading for Enhanced Electrocatalytic Nitrogen Reduction to Ammonia