Cu@Co with Dilatation Strain for High‐Performance Electrocatalytic Reduction of Low‐Concentration Nitric Oxide

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(11)

Published: Dec. 19, 2023

Abstract Electrocatalytic reduction of nitric oxide (NO) to ammonia (NH 3 ) is a clean and sustainable strategy simultaneously remove NO synthesize NH . However, the conversion low concentration still huge challenge. In this work, dilatation strain between Cu Co interface over Cu@Co catalyst built up investigated for electroreduction (volume ratio 1%) The shows high yield 627.20 µg h −1 cm −2 Faradaic efficiency 76.54%. Through combination spherical aberration‐corrected transmission electron microscopy geometric phase analyses, it that atoms occupy lattice sites form in xy direction within region. Further density functional theory calculations temperature‐programmed desorption (NO‐TPD) results show surface on helpful enhance adsorption reduce energy barrier rate‐determining step (*NO *NOH), thereby accelerating catalytic reaction. To realize exhaust gas removal, green synthesis, electricity output, Zn‐NO battery with cathode assembled power 3.08 mW an 273.37

Language: Английский

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Ru Single Atoms Tailoring the Acidity of Metallic Tungsten Dioxide for a Boosted Alkaline Hydrogen Evolution Reaction

ACS Catalysis, Journal Year: 2024, Volume and Issue: 14(11), P. 8238 - 8251

Published: May 13, 2024

Currently, the construction of an acid-like catalyst surface in a high-pH electrolyte is advocated as one most pioneering strategies for significantly improving catalytic activity alkaline hydrogen evolution reaction. However, proton transfer kinetics that determines proton-coupled electron reaction largely dependent on usage extensive noble-metal bulk phase. Herein, well-designed dynamic system constructed by metallic WO2 matrix and supported Ru single atoms (0.89 wt %) grown nickel foam (Ru SAC@WO2/NF). The as-prepared SAC@WO2/NF free-standing exhibits superior activities with delivering current densities 10, 50, 200 mA/cm2 only requiring overpotentials ∼0, 40, 84 mV, respectively, ultralow Tafel slope (38 mV/dec) 1.0 M KOH electrolyte. Moreover, our deliberately prepared composite also shows long-term stability negligible decay after continuous generation at more than 50 h. Comprehensive spectroscopy characterizations combined density function theory calculations reveal improved can be understood two reasons: (i) contributes to environment through formation weak-acid tungsten bronze (HxWOy) intermediates solid–liquid interface electrolyte; (ii) unlike weak electronic interaction between nanoparticles HxWOy intermediates, are evidenced efficiently tailor acidity accelerated deprotonation kinetics, thus resulting regeneration active sites next cycle. Such interesting concept design driven basic chemical theories will benefit exploration but higher added-values water electrolysis beyond.

Language: Английский

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Cross‐Scale Process Intensification of Spindle CuO Supported Tungsten Single‐Atom Catalysts toward Enhanced Electrochemical Hydrogen Production

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

Published: Oct. 15, 2024

Abstract Process intensification engineering of electrocatalysts is crucial to facilitate electrocatalytic reaction, while its cross‐scale modulation great challenge. Herein, the spindle CuO supported tungsten single‐atom catalysts (W SACs) with tunable mesoscale electric field and atomic‐scale coordination structure are reported toward enhanced electrochemical hydrogen evolution process. Finite element analysis indicates can be by tailoring tip angle configuration from 74° 27°, enhancing production rate 5 times. Based on density functional theory calculations, regulation also triggers increase number W–O, which increases charge transfer downshifts d‐band center, stabilizing W sites optimizing desorption The optimized SA /CuO‐27 exhibits much better activity (η 100 = 94 mV) stability (200 mA cm −2 for 120 h) than as‐prepared /CuO‐56 /CuO‐74 analogues. Impressively, anion exchange membrane electrolyzer fabricated presents excellent comparable that commercial electrocatalysts, delivers an ultra‐low attenuation 0.085 h −1 at 300 after continuous electrocatalysis h. This work inspires design high‐efficiency metal synthesis via process engineering.

Language: Английский

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Scalable One-Pot Fabrication of Carbon-Nanofiber-Supported Noble-Metal-Free Nanocrystals for Synergetic-Dependent Green Hydrogen Production: Unraveling Electrolyte and Support Effects

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(15), P. 18768 - 18781

Published: April 8, 2024

Electrocatalytic hydrogen evolution reactions (HER) are envisaged as the most promising sustainable approach for green production. However, considerably high cost often associated with such reactions, particularly upon scale-up, poses a daunting challenge. Herein, facile, effective, and environmentally benign one-pot scalable is developed to fabricate MnM (M═Co, Cu, Ni, Fe) nanocrystals supported over in situ formed carbon nanofibers (MnM/C) efficient noble-metal-free electrocatalysts HER. The formation of entails impregnating cellulose an aqueous solution metal precursors, followed by annealing mixture at 550 °C. During impregnation process, acts reactor inducing reductions salts assistance ether hydroxyl groups drive mass production (several grams) ultralong (5 ± 1 μM) ornamented nanoparticles (10-14 nm size) average loading 2.87 wt %. For better electrocatalytic HER benchmarking, fabricated catalysts were tested different working electrodes, i.e., paper, foam, glassy carbon, presence electrolytes. All MnM/C have demonstrated appealing synergetic-effect-dependent activity, MnCo/C exhibiting best performance close that state-of-the-art commercial Pt/C (10 % Pt), overpotential 11 mV 10 mA cm

Language: Английский

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Cu Embedded in Co–P Nanosheets with Super Wetting Structure for Accelerated Overall Water Splitting under Simulated Industrial Conditions

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: 14(35)

Published: June 20, 2024

Abstract The development of advanced electrocatalysts with exceptional performance at high current densities is pivotal for reducing electric energy consumption in industrial water splitting hydrogen production. Herein, a flexible one‐step electrodeposition approach developed to synthesize superhydrophilic 3D flower‐like clusters Cu–Co–P nanosheets grown situ on nickel foam (NF). Introducing Cu into Co–P causes strong electron interactions, forming an electronic configuration favorable the adsorption and desorption intermediates, which significantly improves intrinsic catalytic activity. as‐deposited Cu–Co–P/NF display notable bifunctional activity low overpotentials 259 65 mV oxygen evolution reactions, respectively, 10 mA cm −2 . Superwetting nanostructures are conducive penetration electrolytes rapid release bubbles, enabling efficient utilization active sites timely bubble stress under densities. An assembled Cu–Co–P/NF(+, −) electrolyzer achieves impressive voltage 1.85 V 500 appreciable stability over 220 h simulated conditions. This work offers attractive strategy regulating superaerophobic splitting, can contribute practical applications.

Language: Английский

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Polyoxometalate-derived bi-functional crystalline/amorphous interfaces with optimized d-electron configuration for efficient self-powered hydrazine-seawater splitting

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 488, P. 150897 - 150897

Published: April 1, 2024

Language: Английский

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Pt-Loaded CoFe-Layered Double Hydroxides for Simultaneously Driving HER and HzOR

ACS Catalysis, Journal Year: 2024, Volume and Issue: 14(19), P. 14937 - 14946

Published: Sept. 25, 2024

Language: Английский

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P-bridged Fe-X-Co coupled sites in hollow carbon spheres for efficient hydrogen generation

Journal of Colloid and Interface Science, Journal Year: 2024, Volume and Issue: 660, P. 792 - 799

Published: Jan. 22, 2024

Language: Английский

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Efficient Hydrazine Electro‐Oxidation Achieved by Tailored Electron Injection into Fe (III) Sites Activating Dehydrogenation

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 34(10)

Published: Nov. 21, 2023

Abstract Tailoring the d‐orbital electron of Fe (III) in oxyhydroxide is highly expected to realize an efficient hydrazine oxidation reaction (HzOR) for assisting seawater electrolysis. Although interface engineering can effectively change states on sites by charge injection or extraction, most interfaces have a directional electric field inaccessible regulation. Herein, combination iron and biphasic nickel phosphide established obtain dual built‐in (BEF) with opposite direction, which aims manipulate configuration sites, thereby optimizing binding strength activating N 2 H 4 intermediates. Both computational experimental analyses reveal that moderate Fe─*N originating from tailored plays key role accelerating dehydrogenation. Impressively, such promising promotion endows catalyst remarkable HzOR activity, realizing working potentials −8 44 mV 10 100 mA cm −2 alkaline seawater, respectively, achieving outstanding long‐term stability over h. production hybrid electrolyzer (HSE) requires dramatically low power consumption 16.4 Wh L −1 ≈100% Faraday efficiency. It believed work sheds new inspiration regulation obtaining advanced electrocatalysts.

Language: Английский

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Two-dimensional bimetallic selenium-containing metal-organic frameworks and their calcinated derivatives as electrocatalysts for overall water splitting

Frontiers in Energy, Journal Year: 2024, Volume and Issue: 18(3), P. 378 - 389

Published: March 1, 2024

Language: Английский

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