Conductive polymer protection strategy to promote electrochemical nitrate reduction to ammonia in highly acidic condition over Cu-based catalyst

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 481, P. 148596 - 148596

Published: Jan. 7, 2024

Language: Английский

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Electrochemical alcohol oxidation reaction on Precious‐Metal‐Free catalysts: Mechanism, activity, and selectivity

Carbon Neutralization, Journal Year: 2024, Volume and Issue: 3(2), P. 285 - 312

Published: March 1, 2024

Abstract The electrochemical alcohol oxidation reaction (AOR) is pivotal for the development of sustainable energy. complete alcohols has attracted extensive attention as a vital process in fuel cells. Moreover, an alternative to oxygen evolution reaction, selective emerges effective means lower energy expenditure associated with electrolytic hydrogen production while yielding high‐value products. Nonprecious metal materials have been widely applied catalysis due their cost‐effectiveness and excellent durability. In recent years, leveraging advantages nonprecious electrocatalytic AOR, researchers delved into catalytic mechanisms various efficient catalysts fabricated evaluated. This review provides overview current advancements diverse systems centered around materials. It systematically summarizes shared traits distinctions characteristics across systems, thereby laying theoretical foundation developing novel catalyst that are efficient, stable, highly selective. will facilitate utilization further toward alcohols.

Language: Английский

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Tandem Effect Promotes MXene‐Supported Dual‐Site Janus Nanoparticles for High‐Efficiency Nitrate Reduction to Ammonia and Energy Output through Zn‐Nitrate Battery

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 9, 2024

Abstract Electrocatalytic nitrate reduction reaction (NO 3 RR) can convert contaminants into ammonia with higher added value. However, due to the NO RR involving complex multi‐electron reactions, there is an urgent need develop efficient electrocatalysts. Herein, CoCu Janus nanoparticles loaded on Ti C 2 T x MXene (CoCu‐Ti ) synthesized via combination of molten salt etching and galvanic replacement strategy. The tandem catalysis NPs maintain balance between nitrogenous intermediates active hydrogen (H ads ). CoCu‐Ti exhibits a high NH yield 8.08 mg h −1 cat. satisfactory Faradaic efficiency 93.6% at −0.7 V versus reversible electrode (RHE). Zn‐NO − battery assembled shows excellent power density 10.33 mW cm −2 , 1.52 95.3% 10 mA which enables simultaneous elimination pollutants, production, energy supply. Moreover, series verification experiments functional theory calculation are combined reveal path catalytic mechanism. This work not only provides new inspiration for design catalysts but also promotes development Zn‐nitrate battery.

Language: Английский

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Developing energy-efficient nitrate-to-ammonia flow cells with bifunctional NiFeW-oxide thin-film electrodes made by magnetron sputtering technique

Applied Catalysis B Environment and Energy, Journal Year: 2024, Volume and Issue: 354, P. 124137 - 124137

Published: April 27, 2024

Language: Английский

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Metal/covalent-organic framework-based electrocatalysts for electrochemical reduction of nitrate to ammonia

Coordination Chemistry Reviews, Journal Year: 2024, Volume and Issue: 518, P. 216061 - 216061

Published: July 8, 2024

The pervasive contamination of industrial, domestic, and agricultural wastewater with nitrate poses profound ecological public health risks. Traditional methods for remediating nitrate-laden water face formidable challenges due to its high solubility stability. However, a promising solution emerges in the form electrochemical reduction (eNO3RR), offering both efficient removal valuable ammonia generation sustainable manner. This review explores burgeoning field eNO3RR, focusing on recent advancements utilizing porous crystalline framework materials − metal–organic frameworks (MOFs) covalent-organic (COFs) as novel class electrocatalysts. These innovative exhibit unique properties such adjustable porosity, diverse structures, tunable pore sizes, well-defined active sites, making them ideal candidates enhancing efficiency selectivity under ambient conditions. By dissecting structure–activity relationship inherent MOF/COF-based electrocatalysts, this aims provide comprehensive understanding their role driving conversion NO3− NH3. Moreover, it identifies current proposes future prospects leveraging these advanced pollutants, glimpse into greener more effective approach remediation resource recovery.

Language: Английский

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Promoting Electrocatalytic Semihydrogenation of Alkynols to Alkenols over a Bimetallic CuAu Alloy Catalyst

ACS Catalysis, Journal Year: 2024, Volume and Issue: 14(8), P. 5675 - 5684

Published: April 1, 2024

Electrocatalytic semihydrogenation of alkynols to alkenols under ambient conditions using H2O as a hydrogen source is highly attractive in synthetic chemistry. However, it still challenging achieve high Faradaic efficiency (FE) wide potential window. Herein, we reported bimetallic Cu3Au alloy an efficient catalyst for electrocatalytic alkenols. Specifically, during 2-butyne-1,4-diol (BYD) 2-butene-1,4-diol (BED), the achieves 12.6-fold greater reaction rate and higher FE compared with pure Cu (99 vs 63%). Moreover, maintains >96% FEs window from −0.19 −0.59 V RHE. We demonstrate that competitive adsorptions reactive (H*) BYD greatly influence processes. The presence Au facilitates H* formation reduces adsorption on Cu, thus enhancing hydrogenation performance. affords broad substrate scope aromatic alkynes, producing corresponding alkenes good selectivities. Finally, coupled glycerol oxidation replace oxygen evolution two-electrode system, showing 40% energy saving at 200 mA BED production coproduction valuable formate anode, demonstrating economical manner.

Language: Английский

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Active Hydroxyl‐Mediated Preferential Cleavage of Carbon‐Carbon Bonds in Electrocatalytic Glycerol Oxidation

Angewandte Chemie International Edition, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 8, 2025

Electrocatalytic glycerol oxidation reaction (GOR) to produce high-value formic acid (FA) is hindered by high formation potential of active species and sluggish C-C bond cleavage kinetics. Herein, Ni single-atom (NiSA) Co (CoSA) dual sites anchored on nitrogen-doped carbon nanotubes embedded with Ni0.1Co0.9 alloy (Ni0.1Co0.9@NiSACoSA-NCNTs) are constructed for electrochemical GOR. Remarkably, it can reach 10 mA cm-2 at a low 1.15 V versus the reversible hydrogen electrode (vs. RHE) realize formate selectivity 93.27 % even conversion 98.81 1.45 vs. RHE. The GOR mechanism pathway systematically elucidated via experimental analyses theoretical calculations. It revealed that hydroxyl (*OH) be produced during NiSA, CoSA, synergistically optimizes electronic structure CoSA sites, reducing energy barriers *OH-mediated bonds dehydrogenation C1 intermediates. This decreases number intermediates steps GOR-to-FA, thus increasing production efficiency. After coupling evolution in membrane assembly cell, 14.26 g 23.10 L H2 100 108 h.

Language: Английский

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In Situ Spectroscopic Probing of the Hydroxylamine Pathway of Electrocatalytic Nitrate Reduction on Iron‐Oxy‐Hydroxide

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

Published: Jan. 14, 2025

Abstract Crystalline γ‐FeO(OH) dominantly possessing ─ OH terminals (𝛾‐FeO(OH) c ), polycrystalline containing multiple O, OH, and Fe pc α‐Fe 2 O 3 majorly surface are used as electrocatalysts to study the effect of on electrocatalytic nitrate reduction reaction (eNO RR) selectivity stabilization intermediates. Brunauer‐Emmett‐Teller analysis electrochemically determined area suggest a high active 117.79 m g −1 (ECSA: 0.211 cm ) for 𝛾‐FeO(OH) maximizing accessibility adsorption exhibiting selective eNO RR NH at pH 7 with yield rate 18.326 mg h −2 , >85% Faradaic efficiency (FE), least nine‐times catalyst‐recyclability. 15 N‐ D‐labeling combined in situ IR Raman studies validate ions generation nitrite hydroxyl amine A kinetic isotope (KIE) value 2.1 indicates H proton source proton‐coupled electron transfer rate‐limiting step. The rotating‐ring disk electrochemical (RRDE) subsequent Koutecký‐Levich reveal electron‐transfer constant (k) 2e‐ is 5.7 × 10 −6 s . This provides direct evidence formation dominant pathway γ‐FeO(OH).

Language: Английский

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Unlocking high-current-density nitrate reduction and formaldehyde oxidation synergy for scalable ammonia production and fixation

Energy & Environmental Science, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Single atom Ag-decorated Cu 2 O nanowires achieve two-ampere-level nitrate-to-ammonia conversion, facilitating further ammonia fixation into ammonium formate at 10 g-scale.

Language: Английский

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Layered double hydroxides: next promising materials for energy storage and conversion

Next Materials, Journal Year: 2023, Volume and Issue: 1(4), P. 100040 - 100040

Published: Sept. 27, 2023

Layered double hydroxides (LDHs) are a family of two-dimensional (2D) layered materials with controllable supramolecular structure and unique physicochemical properties, making them highly attractive in the fields energy storage conversion. Considering intense interest LDHs family, this review aims to provide comprehensive summary their development history, synthesis strategies, energy-related applications. Special attention is given distinctive properties LDHs, such as oriented assembly topological transformation, which can serve systematic guidance for preparation LDHs-based nanostructures. Furthermore, outlines both classical cutting-edge applications electrocatalysis. Of particular interest, emerging coupling system based on electrocatalytic water splitting thoroughly analyzed. Finally, prospects potential challenges discussed, aiming raise awareness among researchers stimulate further progress material development.

Language: Английский

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