Manipulating the Water Dissociation Electrocatalytic Sites of Bimetallic Nickel‐Based Alloys for Highly Efficient Alkaline Hydrogen Evolution

Angewandte Chemie International Edition, Год журнала: 2022, Номер 61(30)

Опубликована: Апрель 20, 2022

Transition-metal alloys are currently drawing increasing attention as promising electrocatalysts for the alkaline hydrogen evolution reaction (HER). However, traditional density-functional-theory-derived d-band theory fails to describe adsorption energy (ΔGH ) on hollow sites. Herein, by studying ΔGH a series of Ni-M (M=Ti, V, Cr, Mn, Fe, Co, Cu, Zn, Mo, W) bimetallic alloys, an improved center was provided and potential NiCu electrocatalyst with near-optimal discovered. Moreover, oxygen atoms were introduced into (O-NiM) balance adsorption/desorption hydroxyl species. The tailored electrocatalytic sites water dissociation can synergistically accelerate multi-step HER. prepared O-NiCu shows optimum HER activity low overpotential 23 mV at 10 mA cm-2 . This work not only broadens applicability theory, but also provides crucial understanding designing efficient electrocatalysts.

Язык: Английский

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Design Engineering, Synthesis Protocols, and Energy Applications of MOF-Derived Electrocatalysts

Nano-Micro Letters, Год журнала: 2021, Номер 13(1)

Опубликована: Июнь 1, 2021

The core reactions for fuel cells, rechargeable metal-air batteries, and hydrogen production are the oxygen reduction reaction (ORR), evolution (OER), (HER), which heavily dependent on efficiency of electrocatalysts. Enormous attempts have previously been devoted in non-noble electrocatalysts born out metal-organic frameworks (MOFs) ORR, OER, HER applications, due to following advantageous reasons: (i) significant porosity eases electrolyte diffusion; (ii) supreme catalyst-electrolyte contact area enhances diffusion efficiency; (iii) electronic conductivity can be extensively increased owing unique construction block subunits MOFs-derived electrocatalysis. Herein, recent progress including synthesis protocols, design engineering, DFT calculations roles, energy applications is discussed reviewed. It concluded that elevated performances attributed an advantageously well-designed high-porosity structure, surface area, plentiful active centers. Furthermore, perspectives MOF-derived presented.

Язык: Английский

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Coupling Glucose‐Assisted Cu(I)/Cu(II) Redox with Electrochemical Hydrogen Production

Advanced Materials, Год журнала: 2021, Номер 33(48)

Опубликована: Сен. 24, 2021

Abstract Water electrolysis is a sustainable technology for hydrogen production since this process can utilize the intermittent electricity generated by renewable energy such as solar, wind, and hydro. However, large‐scale application of restricted high consumption due to large potential gap ( > 1.23 V) between anodic oxygen evolution reaction cathodic (HER). Herein, novel efficient system developed coupling glucose‐assisted Cu(I)/Cu(II) redox with HER. The onset electrooxidation Cu(I) Cu(II) low 0.7 V RHE (vs reversible electrode). In situ Raman spectroscopy, ex X‐ray photoelectron density functional theory calculation demonstrates that glucose in electrolyte reduce into instantaneously via thermocatalysis process, thus completing cycle redox. assembled electrolyzer only requires voltage input 0.92 achieve current 100 mA cm −2 . Consequently, per cubic H 2 produced 2.2 kWh, half value conventional water (4.5 kWh). This work provides promising strategy low‐cost, high‐purity

Язык: Английский

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Water electrolysis for hydrogen production: from hybrid systems to self-powered/catalyzed devices

Energy & Environmental Science, Год журнала: 2023, Номер 17(1), С. 49 - 113

Опубликована: Ноя. 7, 2023

This perspective highlights recent advancements in innovative strategies to provide valuable insights into the potential for energy-saving hydrogen production through water electrolysis.

Язык: Английский

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Microenvironment Engineering of Single/Dual‐Atom Catalysts for Electrocatalytic Application

Advanced Materials, Год журнала: 2023, Номер 35(31)

Опубликована: Фев. 23, 2023

Single/dual-metal atoms supported on carbon matrix can be modulated by coordination structure and neighboring active sites. Precisely designing the geometric electronic uncovering structure-property relationships of single/dual-metal confront with grand challenges. Herein, this review summarizes latest progress in microenvironment engineering single/dual-atom sites via a comprehensive comparison single-atom catalyst (SACs) dual-atom catalysts (DACs) term design principles, modulation strategy, theoretical understanding structure-performance correlations. Subsequently, recent advances several typical electrocatalysis process are discussed to get general reaction mechanisms finely-tuned SACs DACs. Finally, full-scaled summaries challenges prospects given for This will provide new inspiration development atomically dispersed electrocatalytic application.

Язык: Английский

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Rhodium nanocrystals on porous graphdiyne for electrocatalytic hydrogen evolution from saline water

Nature Communications, Год журнала: 2022, Номер 13(1)

Опубликована: Сен. 5, 2022

The realization of the efficient hydrogen conversion with large current densities at low overpotentials represents development trend this field. Here we report atomic active sites tailoring through a facile synthetic method to yield well-defined Rhodium nanocrystals in aqueous solution using formic acid as reducing agent and graphdiyne stabilizing support. High-resolution high-angle annular dark-field scanning-transmission electron microscopy images show high-density steps on faces hexahedral Rh nanocrystals. Experimental results reveal formation stable sp-C~Rh bonds can stabilize further improve charge transfer ability system. density functional theory calculation solidly demonstrate exposed high stepped surfaces various metal affect electronic structure catalyst reduce overpotential resulting large-current production from saline water. This exciting result demonstrates unmatched electrocatalytic performance highly water electrolysis.

Язык: Английский

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

Angewandte Chemie International Edition, Год журнала: 2022, Номер 61(45)

Опубликована: Авг. 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.

Язык: Английский

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Perspective of hydrogen energy and recent progress in electrocatalytic water splitting

Chinese Journal of Chemical Engineering, Год журнала: 2022, Номер 43, С. 282 - 296

Опубликована: Фев. 26, 2022

Язык: Английский

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Earth‐Abundant Metal‐Based Electrocatalysts Promoted Anodic Reaction in Hybrid Water Electrolysis for Efficient Hydrogen Production: Recent Progress and Perspectives

Advanced Energy Materials, Год журнала: 2022, Номер 12(25)

Опубликована: Май 20, 2022

Abstract Exploring advanced technologies to efficiently produce green hydrogen energy is imperative alleviate the crisis and environmental pollution. Conventional overall water electrolysis (OWE) has been regarded as a promising approach for effective H 2 production, however, it largely restricted by sluggish kinetics of anodic oxygen evolution reaction (OER). Coupling kinetically favorable reactions, such biomass‐derived compound oxidation pollutant degradation, with (HER) in hybrid (HWE), can not only solve biomass recycling emission problems but also save cost clean generation. Hence, various earth‐abundant electrocatalysts have developed catalyze those yet some tedious preparation unsatisfactory performance still exist. Given gap between research practical applications, this review summarizes recent progress diverse alternative reactions over last five years together their application HWE systems. An in‐depth understanding different mechanisms assessments toward discussed further enhance efficiency. The advantages, differences, critical issues systems are thoroughly well, providing new avenue low‐voltage production from renewable resources waste products.

Язык: Английский

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Electronic Structure Modulation of Nanoporous Cobalt Phosphide by Carbon Doping for Alkaline Hydrogen Evolution Reaction

Advanced Functional Materials, Год журнала: 2021, Номер 31(48)

Опубликована: Сен. 1, 2021

Abstract Seawater electrolysis under alkaline conditions presents an attractive alternative to traditional freshwater for mass sustainable high‐purity hydrogen production. However, the lack of active and robust electrocatalysts severely impedes industrial application this technology. Herein, carbon‐doped nanoporous cobalt phosphide (C‐Co 2 P) prepared by electrochemical dealloying is reported as electrocatalyst evolution reaction (HER). The C‐Co P achieves overpotential 30 mV at a current density 10 mA cm −2 in 1 m KOH, along with impressive catalytic activity stability large densities artificial seawater electrolyte containing mixed chlorides NaCl, MgCl , CaCl . Experimental analysis functional theory calculations reveal that C atom strong electronegativity small atomic radius can tailor electronic structure Co P, leading weakened Co–H bonding toward promoted HER kinetics. Moreover, doping introduces two‐stepped H delivery pathway forming C–H ad intermediate, thus reducing energy barrier water dissociation. This study offers new vision development large‐scale

Язык: Английский

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