Iridium single-atom catalyst for highly efficient NO electroreduction to NH3

Nano Research, Journal Year: 2023, Volume and Issue: 16(7), P. 8737 - 8742

Published: March 8, 2023

Language: Английский

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Plasma-etched Ti₂O₃with oxygen vacancies for enhanced NH₃electrosynthesis and Zn–N₂batteries

Inorganic Chemistry Frontiers, Journal Year: 2022, Volume and Issue: 9(18), P. 4608 - 4613

Published: Jan. 1, 2022

Plasma-etched OV-Ti 2 O 3 behaves as an active and stable catalyst for electrochemical N reduction to yield NH , capable of attaining a large 37.24 μg h −1 mg cat. high faradaic efficiency 19.29%.

Language: Английский

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p-Block Antimony Single-Atom Catalysts for Nitric Oxide Electroreduction to Ammonia

ACS Energy Letters, Journal Year: 2023, Volume and Issue: 8(3), P. 1281 - 1288

Published: Feb. 3, 2023

Electrocatalytic NO reduction to NH3 (NORR) offers a prospective approach attain both harmful removal and efficient electrosynthesis. Main-group p-block metals are promising NORR candidates but still lack adequate exploration. Herein, Sb single atoms confined in amorphous MoO3 (Sb1/a-MoO3) designed as an catalyst, exhibiting the highest yield rate of 273.5 μmol h–1 cm–2 NO-to-NH3 Faradaic efficiency 91.7% at −0.6 V vs RHE. In situ spectroscopic characterizations theoretical computations reason that outstanding performance Sb1/a-MoO3 arises from isolated Sb1 sites, which can optimize adsorption *NO/*NHO lower reaction energy barriers simultaneously exhibit higher affinity than H2O/H species. Moreover, our strategy be extended prepare Bi1/a-MoO3, showing high property, demonstrating immense potential metal single-atom catalysts toward high-performing electrocatalysis.

Language: Английский

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Electrochemical nitrate reduction in acid enables high-efficiency ammonia synthesis and high-voltage pollutes-based fuel cells

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: Dec. 5, 2023

Abstract Most current research is devoted to electrochemical nitrate reduction reaction for ammonia synthesis under alkaline/neutral media while the investigation of acidic conditions rarely reported. In this work, we demonstrate potential TiO 2 nanosheet with intrinsically poor hydrogen-evolution activity selective and rapid conditions. Hybridized iron phthalocyanine, resulting catalyst displays remarkably improved efficiency toward formation owing enhanced adsorption, suppressed hydrogen evolution lowered energy barrier rate-determining step. Then, an alkaline-acid hybrid Zn-nitrate battery was developed high open-circuit voltage 1.99 V power density 91.4 mW cm –2 . Further, environmental sulfur recovery can be powered by above hydrazine-nitrate fuel cell simultaneously hydrazine/nitrate conversion electricity generation. This work demonstrates attractive electrosynthesis broadens field conversion.

Language: Английский

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Durable Electrocatalytic Reduction of Nitrate to Ammonia over Defective Pseudobrookite Fe₂TiO₅Nanofibers with Abundant Oxygen Vacancies

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 62(5)

Published: Dec. 5, 2022

We propose the pseudobrookite Fe2 TiO5 nanofiber with abundant oxygen vacancies as a new electrocatalyst to ambiently reduce nitrate ammonia. Such catalyst achieves large NH3 yield of 0.73 mmol h-1 mg-1cat. and high Faradaic Efficiency (FE) 87.6 % in phosphate buffer saline solution 0.1 M NaNO3 , which is lifted 1.36 96.06 at -0.9 V vs. RHE for nitrite conversion ammonia NaNO2 . It also shows excellent electrochemical durability structural stability. Theoretical calculation reveals enhanced conductivity this an extremely low free energy -0.28 eV adsorption presence vacant oxygen.

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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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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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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