Boosting the Production of Hydrogen from an Overall Urea Splitting Reaction Using a Tri‐Functional Scandium–Cobalt Electrocatalyst

Small, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 24, 2024

Abstract The creation of highly efficient and economical electrocatalysts is essential to the massive electrolysis water produce clean energy. ability use urea reaction oxidation (UOR) in place oxygen/hydrogen evolution process (OER/HER) during splitting a significant step toward production high‐purity hydrogen with less energy usage. Empirical evidence suggests that UOR consists two stages. First, metal sites undergo an electrochemical pre‐oxidation reaction, then molecules on high‐valence are chemically oxidized. Here, scandium‐doped CoTe supported carbon nanotubes called Sc@CoTe/CNT reported CoTe/CNT as composite efficiently promote generation from durable active for OER/UOR/HER alkali solutions. Electrochemical impedance spectroscopy indicates facilitates charge transfer across interface. Furthermore, nanocatalyst has high performance KOH KOH‐containing solutions demonstrated by HER, OER, (215 mV, 1.59, 1.31 V, respectively, at 10 mA cm −2 1 m KOH) shows 195 1.61 1.3 respectively. Consequently, total system achieves 1.29 whereas overall device obtaines 1.49 V 1.54, 1.48 This work presents viable method combining HER maximally effective production.

Language: Английский

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Main-Group Sn Single Atoms on MoS_2–x for Selective Nitrite Electroreduction to Ammonia

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 14, 2025

Electrocatalytic NO2–-to-NH3 reduction (NO2RR) offers an attractive way to remedy polluted NO2– and produce value-added NH3. In this study, main-group Sn single atoms anchored on S-vacancy-rich MoS2–x (Sn1/MoS2–x) are explored as a highly selective NO2RR catalyst. Combined theoretical computations in situ spectroscopic measurements reveal that the isolated Sn1 sites of Sn1/MoS2–x can not only promote activation hydrogenation but also favor NH3 desorption restrict H adsorption, thus enabling for synthesis. Remarkably, exhibits NH3–Faradaic efficiency 98.8% yield rate 1922.3 μmol h–1 cm–2 flow cell, outperforming most catalysts reported date.

Language: Английский

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Ag on NiCo Layered Double Hydroxide as Oxygen Evolution Electrocatalyst for Anion Exchange Membrane Water Electrolyzer Under Large Current Densities

Small Methods, Journal Year: 2025, Volume and Issue: unknown

Published: March 30, 2025

Abstract A facile and universal strategy is employed to synthesize Ag decorated NiCo layered double hydroxide (LDH) heterogeneous structure for the oxygen evolution reaction (OER). The nanoparticles are deposited on LDH nanosheets via a spontaneous redox reaction. synthesized Ag/NiCo achieves an overpotential of 460 mV at current density 1 cm −2 geo , surpassing that (722 mV). In anion exchange membrane water electrolyzer (AEMWE) with as anode Pt/C cathode, cell can deliver ultrahigh 5 low voltage 2.10 V. This superior nearly four times larger than AEMWEs other non‐precious electrocatalysts reported in literature under same effective area. Furthermore, it exhibits desired durability no performance decay over 300 h which almost six longer IrO 2 anode. Operando electrochemical impedance spectroscopy results reveal decoration facilitates active site formation reduces OER onset potential compared LDH. study showcases practical approach designing highly durable industrial hydrogen production.

Language: Английский

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Two-dimensional Nanomaterial-based Heterogeneous Catalysts for Sustainable Ammonia Production

Royal Society of Chemistry eBooks, Journal Year: 2025, Volume and Issue: unknown, P. 259 - 278

Published: April 4, 2025

Two-dimensional (2D) nanomaterials have attracted tremendous attention from researchers working in the field of heterogeneous catalysis. Owing to unique advantages offered by 2D nanomaterials, such as high surface area, abundant reaction sites, improved electrical and optical properties, excellent support materials, etc., they been widely utilized synthesizing several hybrid materials different catalytic applications. This chapter focuses, particular, on application nanomaterial-based catalysts sustainable ammonia (NH3) synthesis. In recent years, research has delved into establishing new technologies for green NH3 synthesis a replacement conventional Haber–Bosch process. this chapter, three approaches, namely, photocatalysis, electrocatalysis, photoelectrocatalysis, are discussed detail. Some examples composites, doped systems, defect-engineered presented provide glimpse these processes. Finally, summary progress an outline future directions production discussed.

Language: Английский

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Low-dimensional materials for ammonia synthesis

Chemical Society Reviews, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Low-dimensional materials (LDMs), including 0D, 1D, and 2D nanostructures their heterostructures, are reviewed for applications in photocatalytic, electrocatalytic, photoelectrocatalytic synthesis of value-added ammonia.

Language: Английский

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Paired Chemical Upgrading in Photoelectrochemical Cells

JACS Au, Journal Year: 2025, Volume and Issue: unknown

Published: April 23, 2025

Language: Английский

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Low content of Ni‐Pt nanoparticles decorated carbon nanofibers as efficient electrocatalyst for hydrogen evolution reaction

Journal of Chemical Technology & Biotechnology, Journal Year: 2024, Volume and Issue: 99(4), P. 852 - 862

Published: Jan. 22, 2024

Abstract Background Among various technologies, electrochemical water splitting is one of the most effective and promising techniques for obtaining hydrogen fuel. The low content nickel–platinum (Ni‐Pt) nanoparticles (NPs) decorated on carbon nanofibers (CNFs) have been developed by electrospinning technique subsequent carbonization process use in an evolution reaction (HER) both acidic alkaline mediums. Results Ni‐Pt ions are reduced to NPs during process, while polyacrylonitrile simultaneously changed into nanofibers. Field emission scanning electron microscopy (FE‐SEM) with energy dispersive X‐ray (EDX) transmission (TEM) analysis prepared Ni‐Pt/CNFs shows that Ni Pt evenly dispersed This implies close contacts, there charge transfer between CNFs system. obtained exhibit enhanced HER performance along onset potential ( η 1 /23 mV ~0 pH /33 ~14 pH) overpotential 10 /128 /152 ~14) versus RHE. Furthermore, stability a long time was attained without considerable decay 24 h. turnover frequency (TOF) value 3.431 s −1 1.174 electrolytes. Conclusion could be ascribed synergetic effects fibers NPs. work demonstrates easy producing highly electrocatalysts has significant implications renewable energy. © 2024 Society Chemical Industry (SCI).

Language: Английский

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Nanocrystalline CeMo₂O₈ Catalyst for Electroreduction of N₂ to NH₃

ACS Applied Nano Materials, Journal Year: 2024, Volume and Issue: 7(4), P. 4199 - 4209

Published: Feb. 1, 2024

Nitrogen reduction reaction (NRR) could be a renewable replacement for the energy-intensive Haber–Bosch approach synthesizing NH3. Hence, electrocatalytic NRR powered by energy sources under milder conditions as green and sustainable NH3 production has attracted excellent interest these days. In this approach, electrocatalysts act core of NRR. However, developing efficient is highly required method, existing severely suffer with less activity selectivity. Herein, we report metal oxide, CeMo2O8, an electrocatalyst notable yield FE 55.7 μg h–1 mg–1cat 48% at −0.50 V in 0.1 M HCl. The experimental observations CeMo2O8 have proven that synergistic interaction between Ce Mo favors Ce4+/Ce3+ redox cycle thus increases amount Ce3+. abundant oxygen vacancies synthesized contribute to elevated

Language: Английский

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Visible Light‐Driven Synthesis of PtCu Alloy Nanodendrites for Electrocatalytic Nitrogen‐Conversion Reactions

Advanced Sustainable Systems, Journal Year: 2024, Volume and Issue: unknown

Published: June 21, 2024

Abstract Hierarchical metal alloy nanostructures with branched morphologies are highly desirable for electrocatalysis due to their large surface area, exposed active sites and stability catalytic reactions. In this work, the successful synthesis of uniformly‐sized, spherical Pt–Cu nanodendrites reported using a novel visible light‐driven photoreduction method that exploits fluorescein as an excited state photosensitizer. Factors influencing structure morphology PtCu systematically explored, including pH, Pt 4+ Cu 2+ concentrations, Pt:Cu molar ratio, Light emitting diode (LED) light irradiation time, intensity, concentration hexadecyl trimethyl ammonium bromide (CTAB), triethylamine (TEA). The experiments reveal simultaneous photoreduction/galvanic replacement mechanism nanodendrite formation. Importantly, easily separable from reaction solution, facilitating use electrocatalysts electrocatalytic nitrite reduction (eNO 2 RR) ammonia also nitrogen oxidation (NOR) nitrate. outperforms commercially available nanoparticle catalyst in both NO RR NOR, validating approach.

Language: Английский

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In Situ Preparation of Mo:BiVO₄ Photoanodes Coupled with BiOBr Cathode for Efficient Photoelectrocatalytic CO₂ Reduction Performance

Solar RRL, Journal Year: 2024, Volume and Issue: 8(8)

Published: March 14, 2024

Photoanode‐driven photoelectrocatalytic (PEC) reduction of CO 2 is an ideal way for solving problems such as the greenhouse effect and environmental crisis. In this study, a one‐step hydrothermal method successfully used preparation BiVO 4 films doped with different mass fractions Mo. results, it shown that when Mo at 1.5 wt%, photocurrent densities up to 4.11 mA cm −2 are obtained, 3.36 times greater than those undoped , there marked cathodic shifting water oxidation reaction initiation potential. Subsequently, coupling BiOBr nanosheet cathode, generated CH 3 OH rate reaches 45.67 μmol L −1 h low applied voltage 1.2 V RHE Faraday efficiency 60.68% PEC reduction. This work important Bi‐based thin‐film self‐assembly coupled systems.

Language: Английский

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