Iron‐Based Nanocatalysts for Electrochemical Nitrate Reduction

Small Methods, Journal Year: 2022, Volume and Issue: 6(10)

Published: Sept. 14, 2022

Abstract Nitrate has a high level of stability and persistence in water, endangering human health aquatic ecosystems. Due to its reliability efficiency, the electrochemical nitrate reduction reaction (NO 3 RR) is regarded as best available option for mitigating excess water wastewater, especially removal trace levels nitrate. One most critical factors are catalysts, which directly affect efficiency removal. Iron‐based nanocatalysts, have advantages nontoxicity, wide availability, low cost, emerged promising NO RR material recent years. This review covers major aspects iron‐based nanocatalysts RR, including synthetic methods, structural design, performance enhancement, electrocatalytic test, mechanism. The progress mechanism functional modified structures reviewed from perspectives loading, doping, assembly strategies, order realize conversion pollutant harmless nitrogen or ammonia other sustainable products. Finally, challenges future directions development low‐cost highly‐efficient explored.

Language: Английский

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Oxygen vacancies in Co₃O₄nanoarrays promote nitrate electroreduction for ammonia synthesis

Sustainable Energy & Fuels, Journal Year: 2022, Volume and Issue: 6(18), P. 4130 - 4136

Published: Jan. 1, 2022

Oxygen vacancy-enriched Co 3 O 4 nanosheet arrays enable ambient electrosynthesis of NH via nitrate reduction, achieving a faradaic efficiency 96.9% and yield 12 157 μg h −1 cm −2 in 0.1 M NaOH with NO − .

Language: Английский

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Constructing Co@TiO₂ Nanoarray Heterostructure with Schottky Contact for Selective Electrocatalytic Nitrate Reduction to Ammonia

Small, Journal Year: 2023, Volume and Issue: 19(17)

Published: Jan. 30, 2023

Electrochemical nitrate (NO3- ) reduction reaction RR) is a potential sustainable route for large-scale ambient ammonia (NH3 synthesis and regulating the nitrogen cycle. However, as this involves multi-electron transfer steps, it urgently needs efficient electrocatalysts on promoting NH3 selectivity. Herein, rational design of Co nanoparticles anchored TiO2 nanobelt array titanium plate (Co@TiO2 /TP) presented high-efficiency electrocatalyst NO3- RR. Density theory calculations demonstrate that constructed Schottky heterostructures coupling metallic with semiconductor develop built-in electric field, which can accelerate rate determining step facilitate adsorption, ensuring selective conversion to . Expectantly, Co@TiO2 /TP attains an excellent Faradaic efficiency 96.7% high yield 800.0 µmol h-1 cm-2 under neutral solution. More importantly, heterostructure catalyst also presents remarkable stability in 50-h electrolysis test.

Language: Английский

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Atomically Fe-doped MoS2−x with Fe-Mo dual sites for efficient electrocatalytic NO reduction to NH3

Applied Catalysis B Environment and Energy, Journal Year: 2022, Volume and Issue: 324, P. 122241 - 122241

Published: Nov. 29, 2022

Language: Английский

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Self-Tandem Electrocatalytic NO Reduction to NH₃ on a W Single-Atom Catalyst

Nano Letters, Journal Year: 2023, Volume and Issue: 23(5), P. 1735 - 1742

Published: Feb. 14, 2023

We design single-atom W confined in MoO3-x amorphous nanosheets (W1/MoO3-x) comprising W1-O5 motifs as a highly active and durable NORR catalyst. Theoretical operando spectroscopic investigations reveal the dual functions of to (1) facilitate activation protonation NO molecules (2) promote H2O dissociation while suppressing *H dimerization increase proton supply, eventually resulting self-tandem mechanism W1/MoO3-x greatly accelerate energetics NO-to-NH3 pathway. As result, exhibits highest NH3-Faradaic efficiency 91.2% NH3 yield rate 308.6 μmol h-1 cm-2, surpassing that most previously reported catalysts.

Language: Английский

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V-doped TiO2 nanobelt array for high-efficiency electrocatalytic nitrite reduction to ammonia

Materials Today Physics, Journal Year: 2022, Volume and Issue: 30, P. 100944 - 100944

Published: Dec. 5, 2022

Language: Английский

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High-efficiency electrocatalytic nitrite reduction toward ammonia synthesis on CoP@TiO2 nanoribbon array

iScience, Journal Year: 2023, Volume and Issue: 26(7), P. 107100 - 107100

Published: June 16, 2023

Electrochemical reduction of nitrite (NO2-) can satisfy the necessity for NO2- contaminant removal and deliver a sustainable pathway ammonia (NH3) generation. Its practical application yet requires highly efficient electrocatalysts to boost NH3 yield Faradaic efficiency (FE). In this study, CoP nanoparticle-decorated TiO2 nanoribbon array on Ti plate (CoP@TiO2/TP) is verified as high-efficiency electrocatalyst selective NH3. When measured in 0.1 M NaOH with NO2-, freestanding CoP@TiO2/TP electrode delivers large 849.57 μmol h-1 cm-2 high FE 97.01% good stability. Remarkably, subsequently fabricated Zn-NO2- battery achieves power density 1.24 mW while delivering 714.40 μg cm-2.

Language: Английский

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Ampere-Level Nitrate Electroreduction to Ammonia over Monodispersed Bi-Doped FeS₂

ACS Nano, Journal Year: 2023, Volume and Issue: 17(21), P. 21328 - 21336

Published: Oct. 23, 2023

Electrochemical conversion of NO3– into NH3 (NO3RR) holds an enormous prospect to simultaneously yield valuable and alleviate pollution. Herein, we report monodispersed Bi-doped FeS2 (Bi–FeS2) as a highly effective NO3RR catalyst. Atomic coordination characterizations Bi–FeS2 disclose that the isolated Bi dopant coordinates with its adjacent Fe atom create unconventional p–d hybridized Bi–Fe dinuclear sites. Operando spectroscopic measurements combined theoretical calculations sites can synergistically enhance hydrogenation energetics NO3–-to-NH3 pathway, while suppressing competitive hydrogen evolution, leading high selectivity activity. Consequently, specially designed flow cell equipped exhibits rate 83.7 mg h–1 cm–2 near-100% Faradaic efficiency at ampere-level current density 1023.2 mA cm–2, together excellent long-term stability for 100 h electrolysis, ranking almost highest performance among all reported catalysts.

Language: Английский

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Atomically Dispersed Metal‐Based Catalysts for Zn–CO₂Batteries

Small Structures, Journal Year: 2022, Volume and Issue: 3(12)

Published: Aug. 19, 2022

Rechargeable aqueous Zn–CO 2 batteries show great promise in meeting severe environmental problems and energy crises due to their combination of CO utilization output, as well advantages high theoretical density, abundant raw materials, safety. Developing high‐efficiency stable reduction reaction (CO RR) electrocatalysts is critical importance for the promotion this technology. Atomically dispersed metal‐based catalysts (ADMCs), with extremely atom‐utilization efficiency, tunable coordination environments, superior intrinsic catalytic activity, are emerging promising candidates batteries. Herein, some recent developments atomically summarized, including transition metal non‐transition sites. Moreover, various synthetic strategies, characterization methods, relationship between active site structures RR activity/Zn–CO battery performance introduced. Finally, challenges perspectives also proposed future development ADMCs

Language: Английский

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Electrochemical NO reduction to NH3 on Cu single atom catalyst

Nano Research, Journal Year: 2022, Volume and Issue: 16(4), P. 5857 - 5863

Published: Dec. 23, 2022

Language: Английский

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