Efficient conversion of low-concentration nitrate sources into ammonia on a Ru-dispersed Cu nanowire electrocatalyst

Chen, Feng-Yang; Wu, Zhenyu; Gupta, Srishti; Rivera, Daniel J.; Lambeets, Sten; Pecaut, Stephanie; Kim, Jung Yoon Timothy; Zhu, Peng; Finfrock, Y. Zou; Meira, Débora Motta; King, Graham; Gao, Guanhui; Xu, Wenqian; Cullen, David A.; Zhou, Hua; Han, Yimo; Perea, Daniel E.; Muhich, Christopher L.; Wang, Haotian

doi:10.1038/s41565-022-01121-4

Cited by 551 publications

(504 citation statements)

References 66 publications

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“…Wang and colleagues recently synthesized Ru nanoparticles on Cu nanowires (Fig. 20(c)) [407], which demonstrated a relatively high NO3 − -to-NH3 conversion rate (Fig. 20(d)).…”

Section: Electrochemical Reduction Of Nitrogen Oxyanionsmentioning

confidence: 99%

Recent advances in nanostructured heterogeneous catalysts for N-cycle electrocatalysis

Sun

Liang

Liu

et al. 2022

Nano Research Energy

330

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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“…Wang and colleagues recently synthesized Ru nanoparticles on Cu nanowires (Fig. 20(c)) [407], which demonstrated a relatively high NO3 − -to-NH3 conversion rate (Fig. 20(d)).…”

Section: Electrochemical Reduction Of Nitrogen Oxyanionsmentioning

confidence: 99%

Recent advances in nanostructured heterogeneous catalysts for N-cycle electrocatalysis

Sun

Liang

Liu

et al. 2022

Nano Research Energy

330

229

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“…[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.…”

mentioning

confidence: 99%

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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“…24 Generally, the less full the orbital, the higher the d-band center relative to the Fermi level, and the stronger the binding strength. To optimize the electronic structures of catalysts, strategies such as alloying, 25,26 atomic doping, 27,28 and interface construction 29,30 have been put forward and demonstrated to be effective to improve the catalytic performances.…”

Section: Introductionmentioning

confidence: 99%

Facet and d-band center engineering of CuNi nanocrystals for efficient nitrate electroreduction to ammonia

Zhang

Wang

et al. 2022

Dalton Trans.

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Efficient conversion of low-concentration nitrate sources into ammonia on a Ru-dispersed Cu nanowire electrocatalyst

Cited by 551 publications

References 66 publications

Recent advances in nanostructured heterogeneous catalysts for N-cycle electrocatalysis

Recent advances in nanostructured heterogeneous catalysts for N-cycle electrocatalysis

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

Facet and d-band center engineering of CuNi nanocrystals for efficient nitrate electroreduction to ammonia

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