Designing a Built-In Electric Field for Efficient Energy Electrocatalysis

ACS Nano, Journal Year: 2022, Volume and Issue: 16(12), P. 19959 - 19979

Published: Dec. 15, 2022

To utilize intermittent renewable energy as well achieve the goals of peak carbon dioxide emissions and neutrality, various electrocatalytic devices have been developed. However, reactions, e.g., hydrogen evolution reaction/oxygen reaction in overall water splitting, polysulfide conversion lithium–sulfur batteries, formation/decomposition lithium peroxide lithium–oxygen nitrate reduction to degrade sewage, suffer from sluggish kinetics caused by multielectron transfer processes. Owing merits accelerated charge transport, optimized adsorption/desorption intermediates, raised conductivity, regulation microenvironment, ease combine with geometric characteristics, built-in electric field (BIEF) is expected overcome above problems. Here, we give a Review about very recent progress BIEF for efficient electrocatalysis. First, construction strategies characterization methods (qualitative quantitative analysis) are summarized. Then, up-to-date overviews engineering electrocatalysis, attention on electron structure optimization microenvironment modulation, analyzed discussed detail. In end, challenges perspectives proposed. This gives deep understanding design electrocatalysts next-generation storage devices.

Language: Английский

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Rationally Designing Efficient Electrocatalysts for Direct Seawater Splitting: Challenges, Achievements, and Promises

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(45)

Published: Aug. 23, 2022

Directly splitting seawater to produce hydrogen provides a promising pathway for energy and environmental sustainability. However, current faces many challenges because of the sluggish kinetics, presence impurities, membrane contamination, competitive chloride oxidation reaction at anode, which makes it more difficult than freshwater splitting. This Review firstly introduces basic mechanisms anode cathode reactions during We critically analyze primary principles designing catalysts in terms both oxygen evolution reactions, including with noble metal, metal free, metal-free catalysts. Strategies design effective catalysts, such as active site population, synergistic effect regulation, surface engineering, are discussed. Furthermore, promises, perspectives, developing technologies clean generation summarized.

Language: Английский

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Dual-doping NiMoO4 with multi-channel structure enable urea-assisted energy-saving H2 production at large current density in alkaline seawater

Applied Catalysis B Environment and Energy, Journal Year: 2022, Volume and Issue: 320, P. 121977 - 121977

Published: Sept. 13, 2022

Language: Английский

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Multistep Dissolution of Lamellar Crystals Generates Superthin Amorphous Ni(OH)₂ Catalyst for UOR

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(24)

Published: April 14, 2023

Urea oxidation reaction (UOR) is an ideal replacement of the conventional anodic oxygen evolution (OER) for efficient hydrogen production due to favorable thermodynamics. However, UOR activity severely limited by high potential Ni-based catalysts form Ni3+ , which considered as active site UOR. Herein, using in situ cryoTEM, cryo-electron tomography, and Raman, combined with theoretical calculations, a multistep dissolution process nickel molybdate hydrate reported, whereby NiMoO4 ·xH2 O nanosheets exfoliate from bulk ·H2 nanorods Mo species crystalline water, further results superthin amorphous (II) hydroxide (ANH) flocculus catalyst. Owing structure, ANH catalyst can be oxidized NiOOH at much lower than Ni(OH)2 finally exhibits more order magnitude higher current density (640 mA cm-2 ), 30 times mass activity, 27 TOF those The mechanism provides effective methodology preparation highly catalysts.

Language: Английский

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Recent Advances on Transition‐Metal‐Based Layered Double Hydroxides Nanosheets for Electrocatalytic Energy Conversion

Advanced Science, Journal Year: 2023, Volume and Issue: 10(13)

Published: March 3, 2023

Abstract Transition‐metal‐based layered double hydroxides (TM‐LDHs) nanosheets are promising electrocatalysts in the renewable electrochemical energy conversion system, which regarded as alternatives to noble metal‐based materials. In this review, recent advances on effective and facile strategies rationally design TM‐LDHs electrocatalysts, such increasing number of active sties, improving utilization sites (atomic‐scale catalysts), modulating electron configurations, controlling lattice facets, summarized compared. Then, these fabricated for oxygen evolution reaction, hydrogen urea oxidation nitrogen reduction small molecule oxidations, biomass derivatives upgrading is articulated through systematically discussing corresponding fundamental principles reaction mechanism. Finally, existing challenges density catalytically future prospects nanosheets‐based each application also commented.

Language: Английский

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Surface reconstruction and directed electron transport in NiSe2/MoSe2 Mott-Schottky heterojunction catalysts promote urea-assisted water splitting

Applied Catalysis B Environment and Energy, Journal Year: 2023, Volume and Issue: 341, P. 123312 - 123312

Published: Sept. 20, 2023

Language: Английский

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Urea catalytic oxidation for energy and environmental applications

Chemical Society Reviews, Journal Year: 2024, Volume and Issue: 53(3), P. 1552 - 1591

Published: Jan. 1, 2024

This review evaluates state-of-the-art advances in electrocatalytic and photo(electro)catalytic urea oxidation from fundamentals materials to energy environmental applications.

Language: Английский

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Controlled synthesis of M doped NiVS (M = Co, Ce and Cr) as a robust electrocatalyst for urea electrolysis

Dalton Transactions, Journal Year: 2023, Volume and Issue: 52(37), P. 13161 - 13168

Published: Jan. 1, 2023

Urea electrolysis can be used to treat wastewater containing urea and alleviate the energy crisis, so it is one of best ways solve environmental problems. This paper reports synthesis M doped NiVS (M = Co, Ce Cr) composites by a simple hydrothermal process for first time. What noteworthy that Ce-NiVS material as catalytic electrode requires only 141 mV overpotential hydrogen evolution reaction (HER) 1.291 V potential oxidation (UOR) at current density 10 mA cm-2 in 1.0 KOH 0.5 mixed alkaline solution. Using Ce-NiVS/NF both anode cathode electrolysis, driven voltage 1.55 V, which better than most previous catalysts. Experimental results demonstrate excellent activity materials due formation large number active sites improvement conductivity doping with Ce. Density functional theory calculation shows VS4 has small Gibbs free adsorption, plays major role production process, Ce-NiS higher states (DOS) near Fermi level, indicating electronic conductivity. The synergistic catalysis promoted performance material. work provides guidance optimization design low-cost electrocatalysts replace expensive precious metal-based overall electrolysis.

Language: Английский

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Directed Urea‐to‐Nitrite Electrooxidation via Tuning Intermediate Adsorption on Co, Ge Co‐Doped Ni Sites

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(25)

Published: March 16, 2023

Abstract The electrochemical urea oxidation reaction (UOR) is an alternative to electrooxidation of water for energy–saving hydrogen (H 2 ) production. To maximize this purpose, design catalysts selective urea‐to‐nitrite (NO – with increased electron transfer and high current practically important. Herein, a cobalt, germanium (Co, Ge) co‐doped nickel (Ni) oxyhydroxide catalyst reported first time that directs urea‐to‐NO conversion significant Faradaic efficiency 84.9% at 1.4 V versus reversible electrode significantly boosts UOR activity 448.0 mA cm −2 . Importantly, performance greater than most Ni‐based catalysts. Based on judiciously combined synchrotron‐based measurement, in situ spectroscopy density functional theoretical computation, boosted production results from Co, Ge co‐doping demonstrated optimizes electronic structure Ni sites which adsorption altered as NO‐terminal configuration facilitate CN cleavage *NH formation, thereby expedites pathway NO conversion. Findings highlight the importance tuning intermediate behavior high‐performance electrocatalysts, will be practical benefit range researchers manufacturers replacing conventional energy‐saving H

Language: Английский

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The self-reconstruction of Co-modified bimetallic hydroxysulfide nanosheet arrays for efficient hydrazine assisted water splitting

International Journal of Hydrogen Energy, Journal Year: 2023, Volume and Issue: 49, P. 489 - 497

Published: Aug. 23, 2023

Language: Английский

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