Rational Design of Better Hydrogen Evolution Electrocatalysts for Water Splitting: A Review

Advanced Science, Год журнала: 2022, Номер 9(18)

Опубликована: Апрель 18, 2022

Abstract The excessive dependence on fossil fuels contributes to the majority of CO 2 emissions, influencing climate change. One promising alternative is green hydrogen, which can be produced through water electrolysis from renewable electricity. However, variety and complexity hydrogen evolution electrocatalysts currently studied increases difficulty in integration catalytic theory, catalyst design preparation, characterization methods. Herein, this review first highlights principles for reaction (HER) electrocatalysts, presenting thermodynamics, kinetics, related electronic structural descriptors HER. Second, reasonable design, mechanistic understanding, performance enhancement are deeply discussed based intrinsic extrinsic effects. Third, recent advancements electrocatalytic splitting technology further briefly. Finally, challenges perspectives development highly efficient proposed.

Язык: Английский

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Freestanding Metal–Organic Frameworks and Their Derivatives: An Emerging Platform for Electrochemical Energy Storage and Conversion

Chemical Reviews, Год журнала: 2022, Номер 122(11), С. 10087 - 10125

Опубликована: Апрель 21, 2022

Metal–organic frameworks (MOFs) have recently emerged as ideal electrode materials and precursors for electrochemical energy storage conversion (EESC) owing to their large specific surface areas, highly tunable porosities, abundant active sites, diversified choices of metal nodes organic linkers. Both MOF-based MOF-derived in powder form been widely investigated relation synthesis methods, structure morphology controls, performance advantages targeted applications. However, engage them applications, both binders additives would be required postprocessed electrodes, fundamentally eliminating some the sites thus degrading superior effects MOF-based/derived materials. The advancement freestanding electrodes provides a new promising platform EESC thanks apparent merits, including fast electron/charge transmission seamless contact between current collectors. Benefiting from synergistic effect structures materials, outstanding can achieved, stimulating increasing enthusiasm recent years. This review timely comprehensive overview on structural features fabrication techniques electrodes. Then, latest advances are summarized devices electrocatalysis. Finally, insights into currently faced challenges further perspectives these feasible solutions discussed, aiming at providing set guidance promote development scale-up production commercial

Язык: Английский

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Competitive Coordination‐Oriented Monodispersed Ruthenium Sites in Conductive MOF/LDH Hetero‐Nanotree Catalysts for Efficient Overall Water Splitting in Alkaline Media

Advanced Materials, Год журнала: 2022, Номер 34(12)

Опубликована: Янв. 11, 2022

Rational exploration of efficient, inexpensive, and robust electrocatalysts is critical for the efficient water splitting. Conjugated conductive metal-organic frameworks (cMOFs) with multicomponent layered double hydroxides (LDHs) to construct bifunctional heterostructure catalysts are considered as an but complicated strategy. Here, fabrication a cMOF/LDH hetero-nanotree array catalyst (CoNiRu-NT) coupled monodispersed ruthenium (Ru) sites via controllable grafted-growth strategy reported. Rich-amino hexaiminotriphenylene linkers coordinate LDH nanotrunk form cMOF nanobranches, providing numerous anchoring precisely confine stabilize RuN4 sites. Moreover, reduced Ru moieties facilitate H2 O adsorption dissociation, heterointerface between further modifies chemical electronic structures. Optimized CoNiRu-NT displays significant increase in electrochemical water-splitting properties alkaline media, affording low overpotentials 22 mV at 10 mA cm-2 255 20 hydrogen evolution reaction oxygen reaction, respectively. In actual system, drives overall splitting cell voltage 1.47 V reach . This performance comparable that pure noble-metal-based materials superior most reported MOF-based catalysts.

Язык: Английский

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Integration of Alloy Segregation and Surface CoO Hybridization in Carbon‐Encapsulated CoNiPt Alloy Catalyst for Superior Alkaline Hydrogen Evolution

Advanced Functional Materials, Год журнала: 2023, Номер 33(41)

Опубликована: Июль 28, 2023

Abstract Constructing an efficient alkaline hydrogen evolution reaction (HER) catalyst with low platinum (Pt) consumption is crucial for the cost reduction of energy devices, such as electrolyzers. Herein, nanoflower‐like carbon‐encapsulated CoNiPt alloy catalysts composition segregation are designed by pyrolyzing morphology‐controlled and Pt‐proportion‐tuned metal–organic frameworks (MOFs). The optimized containing 15% NFs (15%: Pt mass percentage, NFs: nanoflowers) exhibits outstanding HER performance a overpotential 25 mV at current density 10 mA cm −2 , far outperforming those commercial Pt/C (47 mV) most advanced catalysts. Such superior activity originates from integration Co‐O hybridization. hierarchical structure guarantees full exposure sites. Density functional theory calculations suggest that components not only promote water dissociation but also facilitate adsorption process, synergistically accelerating kinetics HER. In addition, volcanically distributed surface oxygen content, mainly in form Co 3d O 2p hybridization, which another reason enhanced activity. This work provides feasible insights into design cost‐effective coordinating kinetic sites adjusting appropriate content.

Язык: Английский

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Recent advances in interface engineering strategy for highly‐efficient electrocatalytic water splitting

InfoMat, Год журнала: 2022, Номер 5(1)

Опубликована: Окт. 13, 2022

Abstract The hydrogen energy generated by the electrocatalytic water splitting reaction has been established as a renewable and clean carrier with ultra‐high density, which can well make up for shortcomings of conventional sources, such geographical limitations, climatic dependence, wastage. Notably, introduction electrocatalysts enhance efficiency process to generate hydrogen. Particularly, heterostructure constructed coupling multiple components (or phases) have emerged most promising option due well‐known electronic synergistic effects. existing reviews on interface engineering electrocatalyst design mostly focus relationship between heterostructures specific reactions. However, comprehensive overview integration model building, directional synthesis, mechanism rarely reported. To this end, in review, development catalysts is systematically introduced from perspective classification, growth regulation performance based interfacial microenvironment (bonding, configuration, lattice strain, etc.), thereby offering useful insights construction models. Besides, combined current applications strategies, challenges future are discussed relevant solutions proposed. Overall, review serve theoretical reference mechanism, further promote production technologies low consumption high yield. image

Язык: Английский

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Metal-organic-framework-based materials as platforms for energy applications

Chem, Год журнала: 2023, Номер 10(1), С. 86 - 133

Опубликована: Окт. 10, 2023

Язык: Английский

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Ir Nanoparticles Anchored on Metal‐Organic Frameworks for Efficient Overall Water Splitting under pH‐Universal Conditions

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(17)

Опубликована: Март 2, 2023

The construction of high-activity and low-cost electrocatalysts is critical for efficient hydrogen production by water electrolysis. Herein, we developed an advanced electrocatalyst anchoring well-dispersed Ir nanoparticles on nickel metal-organic framework (MOF) Ni-NDC (NDC: 2,6-naphthalenedicarboxylic) nanosheets. Benefiting from the strong synergy between MOF through interfacial Ni-O-Ir bonds, synthesized Ir@Ni-NDC showed exceptional electrocatalytic performance evolution reaction (HER), oxygen (OER) overall splitting in a wide pH range, superior to commercial benchmarks most reported electrocatalysts. Theoretical calculations revealed that charge redistribution bridge induced optimization H2 O, OH* H* adsorption, thus leading accelerated electrochemical kinetics HER OER. This work provides new clue exploit bifunctional pH-universal splitting.

Язык: Английский

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Design of modified MOFs electrocatalysts for water splitting: High current density operation and long-term stability

Applied Catalysis B Environment and Energy, Год журнала: 2023, Номер 336, С. 122891 - 122891

Опубликована: Май 18, 2023

Язык: Английский

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Electronic Modulation of Metal–Organic Frameworks by Interfacial Bridging for Efficient pH‐Universal Hydrogen Evolution

Advanced Functional Materials, Год журнала: 2022, Номер 33(1)

Опубликована: Окт. 26, 2022

Abstract Designing well‐defined interfacial chemical bond bridges is an effective strategy to optimize the catalytic activity of metal–organic frameworks (MOFs), but it remains challenging. Herein, a facile in situ growth reported for synthesis tightly connected 2D/2D heterostructures by coupling MXene with CoBDC nanosheets. The multifunctional nanosheets high conductivity and ideal hydrophilicity as bridging carriers can ensure structural stability sufficient exposure active sites. Moreover, Co–O–Ti formed at interface effectively triggers charge transfer modulates electronic structure Co‐active site, which enhances reaction kinetics. As result, optimized CoBDC/MXene exhibits superior hydrogen evolution (HER) low overpotentials 29, 41, 76 mV 10 mA cm −2 alkaline, acidic, neutral electrolytes, respectively, comparable commercial Pt/C. Theoretical calculation demonstrates that bridging‐induced electron redistribution optimizes free energy water dissociation adsorption, resulting improved evolution. This study not only provides novel electrocatalyst efficient HER all pH conditions also opens up new avenue designing highly systems.

Язык: Английский

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2D MOF‐assisted Pyrolysis‐displacement‐alloying Synthesis of High‐entropy Alloy Nanoparticles Library for Efficient Electrocatalytic Hydrogen Oxidation

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(33)

Опубликована: Июнь 30, 2023

Multimetallic alloy nanoparticles (NPs) have received considerable attention in various applications due to their compositional variability and exceptional properties. However, the complexity of both general synthesis structure-activity relationships remain long-standing challenges this field. Herein, we report a versatile 2D MOF-assisted pyrolysis-displacement-alloying route successfully synthesize series binary, ternary even high-entropy NPs that are uniformly dispersed on porous nitrogen-doped carbon nanosheets (PNC NSs). As proof utility, obtained Co0.2 Ru0.7 Pt0.1 /PNC NSs exhibits apparent hydrogen oxidation activity durability with record-high mass specific kinetic current 1.84 A mg-1 at overpotential 50 mV, which is approximately 11.5 times higher than Pt benchmark. Both experimental theoretical studies reveal addition engenders phase transition CoRu alloys from hexagonal close-packed (hcp) face-centered cubic (fcc) structure. The elevated reactivity resulted can be attributed optimized adsorption intermediate decreased reaction barrier for water formation. This study opens new avenue development highly efficient compositions functions.

Язык: Английский

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