Pollution to solution: A universal electrocatalyst for reduction of all NOx-based species to NH3

Hao, Ran; Lu, Tian; Cai, Wei; Wang, Lu; Liu, Yuping; Wang, Gui‐Chang; Li, Wei; Ozin, G. A.

doi:10.1016/j.checat.2022.01.022

Cited by 49 publications

(42 citation statements)

References 54 publications

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“…Notably, the j NH3 and FE NH3 values of Cu@C are comparable to those of the most advanced electrocatalysts for NO 3 − electroreduction at high concentrations (≥100 × 10 −3 m). [12,17,20,21,[25][26][27][28][29] The FE NH3 and yield rate of NH 3 for Cu@C with 100 × 10 −3 m NO 3 − decreased by only 3.8% and 13.4% after 20 rounds of successive reactions (Figure S16, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

“…[ 13 ] The negative peaks at 1322 cm −1 derived from the consumption of NO 3 − . [ 20 ] The positive peaks at 1582 and 1640 cm −1 were assigned to the NO x intermediates. [ 32 ] In addition, the positive peaks at 1239 and 1440 cm −1 were ascribed to NO 2 − and NH 4 + , respectively.…”

Section: Resultsmentioning

confidence: 99%

“…[ 32 ] In addition, the positive peaks at 1239 and 1440 cm −1 were ascribed to NO 2 − and NH 4 + , respectively. [ 20,33 ] Clearly, as the applied potential increased, the peak intensity of NO 2 − gradually increased. To assess the concentration of NO 2 − , we quantitatively examined the integrated area of the peaks at 1239 cm −1 .…”

Section: Resultsmentioning

confidence: 99%

“…[12,13] Cu-based catalysts are regarded as highly active for NO 3 − electroreduction, considering that metallic Cu with a large number of occupied d-orbital electrons can donate electrons to the lowest unoccupied π* orbital of NO 3 − . [14,15] Various Cu-based catalysts, including Cu-PCTDA, [16] Cu 50 Ni 50 , [17] Cu/Cu 2 O, [18] Ru-Cu nanowires, [19] CuFe bimetal, [20] and Rh@Cu, [21] have been reported recently for the electroreduction of NO 3 − into NH 3 with high selectivity and yield rate at high concentrations of NO 3 − (≥100 × 10 −3 m). To minimize the negative effects of NO 3 − , the World Health Organization has recommended a maximum concentration of 50 mg L −1 (0.81 × 10 −3 m) NO 3 − in drinking water.…”

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confidence: 99%

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Efficient Electroreduction of Nitrate into Ammonia at Ultralow Concentrations Via an Enrichment Effect

et al. 2022

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The electroreduction of nitrate (NO3−) pollutants to ammonia (NH3) offers an alternative approach for both wastewater treatment and NH3 synthesis. Numerous electrocatalysts have been reported for the electroreduction of NO3− to NH3, but most of them demonstrate poor performance at ultralow NO3− concentrations. In this study, a Cu‐based catalyst for electroreduction of NO3− at ultralow concentrations is developed by encapsulating Cu nanoparticles in a porous carbon framework (Cu@C). At −0.3 V vs reversible hydrogen electrode (RHE), Cu@C achieves Faradaic efficiency for NH3 of 72.0% with 1 × 10−3 m NO3−, which is 3.6 times higher than that of Cu nanoparticles. Notably, at −0.9 V vs RHE, the yield rate of NH3 for Cu@C is 469.5 µg h−1 cm−2, which is the highest value reported for electrocatalysts with 1 × 10−3 m NO3−. An investigation of the mechanism reveals that NO3− can be concentrated owing to the enrichment effect of the porous carbon framework in Cu@C, thereby facilitating the mass transfer of NO3− for efficient electroreduction into NH3 at ultralow concentrations.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

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Efficient Electroreduction of Nitrate into Ammonia at Ultralow Concentrations Via an Enrichment Effect

et al. 2022

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“…16(g)). NORR activity can be improved by reducing CuFeO2 to a bimetallic CuFe catalyst [360]. Using various nitrogen sources (NO, NO2 − , and NO3 − ), the resulting CuFe catalyst produced NH3 in NO-saturated solution and 3 mM NO2 − solution in comparable amounts (Fig.…”

Section: Metal-n2 Based Batteriesmentioning

confidence: 97%

Recent advances in nanostructured heterogeneous catalysts for N-cycle electrocatalysis

Sun

Liang

Liu

et al. 2022

Nano Research Energy

331

229

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To restore the natural nitrogen cycle (N-cycle), artificial N-cycle electrocatalysis with flexibility, sustainability, and compatibility can convert intermittent renewable energy (e.g., wind) to harmful or value-added chemicals with minimal carbon emissions. The background of such N-cycles, such as nitrogen fixation, ammonia oxidation, and nitrate reduction, is briefly introduced here. The discussion of emerging nanostructures in various conversion reactions is focused on the architecture/compositional design, electrochemical performances, reaction mechanisms, and instructive tests. Energy device advancements for achieving more functions as well as in situ/operando characterizations toward understanding key steps are also highlighted. Furthermore, some recently proposed reactions as well as less discussed C-N coupling reactions are also summarized. We classify inorganic nitrogen sources that convert to each other under an applied voltage into three types, namely, abundant nitrogen, toxic nitrate (nitrite), and nitrogen oxides, and useful compounds such as ammonia, hydrazine, and hydroxylamine, with the goal of providing more critical insights into strategies to facilitate the development of our circular nitrogen economy.

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Boosting the Electroactivity of Porous Ni₂P/Pd₆P Nanorods for Nitrate to Ammonia Through Hydrogen Spillover Effect

Zhang,

Wang,

Zong

et al. 2023

Adv Funct Materials

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In contrast to the energy‐intensive Haber‐Bosch process, the electroreduction of nitrate to ammonia presents a promising alternative. In this work, the Ni2P/Pd6P nanorods (named NiPdP‐NR) are successfully synthesized by using a simple phosphating process with NiIIPdII‐dimethylglyoxime complex (NiIIPdII‐DMG) nanorods as the precursor. Density functional theory calculations and electrochemical experiments prove that the introduction of Pd facilitates hydrogen spillover from Pd to Ni2P modulates the surface electronic structures, and therefore improves the catalytic kinetics of nitrate reduction ultimately. According to the dynamic experiment, the as‐prepared NiPdP‐NR shows high nitrate conversion efficiency (90.6%), selectivity of NH3 (93.4%), high Faradic efficiency (92.6%), and NH3 yield rate (0.908 mmol h−1 mgcat−1) for the nitrate reduction.

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Pollution to solution: A universal electrocatalyst for reduction of all NOx-based species to NH3

Cited by 49 publications

References 54 publications

Efficient Electroreduction of Nitrate into Ammonia at Ultralow Concentrations Via an Enrichment Effect

Efficient Electroreduction of Nitrate into Ammonia at Ultralow Concentrations Via an Enrichment Effect

Recent advances in nanostructured heterogeneous catalysts for N-cycle electrocatalysis

Boosting the Electroactivity of Porous Ni₂P/Pd₆P Nanorods for Nitrate to Ammonia Through Hydrogen Spillover Effect

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Pollution to solution: A universal electrocatalyst for reduction of all NOx-based species to NH3

Cited by 49 publications

References 54 publications

Efficient Electroreduction of Nitrate into Ammonia at Ultralow Concentrations Via an Enrichment Effect

Efficient Electroreduction of Nitrate into Ammonia at Ultralow Concentrations Via an Enrichment Effect

Recent advances in nanostructured heterogeneous catalysts for N-cycle electrocatalysis

Boosting the Electroactivity of Porous Ni2P/Pd6P Nanorods for Nitrate to Ammonia Through Hydrogen Spillover Effect

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Product

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About

Boosting the Electroactivity of Porous Ni₂P/Pd₆P Nanorods for Nitrate to Ammonia Through Hydrogen Spillover Effect