Self‐Supported Transition‐Metal‐Based Electrocatalysts for Hydrogen and Oxygen Evolution

Advanced Materials, Год журнала: 2019, Номер 32(3)

Опубликована: Апрель 1, 2019

Abstract Electrochemical water splitting is a promising technology for sustainable conversion, storage, and transport of hydrogen energy. Searching earth‐abundant hydrogen/oxygen evolution reaction (HER/OER) electrocatalysts with high activity durability to replace noble‐metal‐based catalysts plays paramount importance in the scalable application electrolysis. A freestanding electrode architecture highly attractive as compared conventional coated powdery form because enhanced kinetics stability. Herein, recent progress developing transition‐metal‐based HER/OER electrocatalytic materials reviewed selected examples chalcogenides, phosphides, carbides, nitrides, alloys, phosphates, oxides, hydroxides, oxyhydroxides. Focusing on self‐supported electrodes, latest advances their structural design, controllable synthesis, mechanistic understanding, strategies performance enhancement are presented. Remaining challenges future perspectives further development also discussed.

Язык: Английский

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Single-Atom Vacancy Defect to Trigger High-Efficiency Hydrogen Evolution of MoS₂

Journal of the American Chemical Society, Год журнала: 2020, Номер 142(9), С. 4298 - 4308

Опубликована: Янв. 30, 2020

Defect engineering is widely applied in transition metal dichalcogenides (TMDs) to achieve electrical, optical, magnetic, and catalytic regulation. Vacancies, regarded as a type of extremely delicate defect, are acknowledged be effective flexible general modulation. However, the influence vacancy states addition concentration on catalysis still remains vague. Thus, via high throughput calculations, optimized sulfur (S-vacancy) state terms both distribution initially figured out among series MoS2 models for hydrogen evolution reaction (HER). In order realize it, facile mild H2O2 chemical etching strategy implemented introduce homogeneously distributed single S-vacancies onto nanosheet surface. By systematic tuning duration, temperature, solution concentration, comprehensive modulation S-vacancy achieved. The optimal HER performance reaches Tafel slope 48 mV dec–1 an overpotential 131 at current density 10 mA cm–2, indicating superiority over agglomerate S-vacancies. This ascribed more surface electronic structure well boosted electrical transport properties. bridging gap, some extent, between precise design from theory practical experiments, proposed extends defect sophisticated level further unlock potential enhancement.

Язык: Английский

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Synergistic coupling of CoFe-LDH arrays with NiFe-LDH nanosheet for highly efficient overall water splitting in alkaline media

Applied Catalysis B Environment and Energy, Год журнала: 2019, Номер 253, С. 131 - 139

Опубликована: Апрель 18, 2019

Язык: Английский

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Engineering active sites on hierarchical transition bimetal oxides/sulfides heterostructure array enabling robust overall water splitting

Nature Communications, Год журнала: 2020, Номер 11(1)

Опубликована: Окт. 29, 2020

Rational design of the catalysts is impressive for sustainable energy conversion. However, there a grand challenge to engineer active sites at interface. Herein, hierarchical transition bimetal oxides/sulfides heterostructure arrays interacting two-dimensional MoOx/MoS2 nanosheets attached one-dimensional NiOx/Ni3S2 nanorods were fabricated by oxidation/hydrogenation-induced surface reconfiguration strategy. The NiMoOx/NiMoS array exhibits overpotentials 38 mV hydrogen evolution and 186 oxygen 10 mA cm-2, even surviving large current density 500 cm-2 with long-term stability. Due optimized adsorption energies accelerated water splitting kinetics theory calculations, assembled two-electrode cell delivers industrially relevant densities 1000 record low voltages 1.60 1.66 V excellent durability. This research provides promising avenue enhance electrocatalytic performance engineering interfacial toward large-scale splitting.

Язык: Английский

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Rational Design of Nanoarray Architectures for Electrocatalytic Water Splitting

Advanced Functional Materials, Год журнала: 2019, Номер 29(20)

Опубликована: Янв. 21, 2019

Abstract Electrochemical water splitting is recognized as a practical strategy for impelling the transformation of sustainable energy sources such solar from electricity to clean hydrogen fuel. To actualize large‐scale production, it paramount develop low‐cost, earth‐abundant, efficient, and stable electrocatalysts. Among those electrocatalysts, alternative architectural arrays grown on conductive substrates have been proven be highly efficient toward due large surface area, abundant active sites, synergistic effects between electrocatalysts substrates. Herein, advancement nanoarray architectures in electrocatalytic applications reviewed. The categories different nanoarrays reliable versatile synthetic approaches are summarized. A unique emphasis highlighted promising strategies enhance activities stability by component manipulation, heterostructure regulation, vacancy engineering. intrinsic mechanism analysis electronic structure optimization, intermediates' adsorption facilitation, coordination environments' amelioration also discussed with regard theoretical simulation situ identification. Finally, challenges opportunities valuable directions pathways outstanding performance provided conversion field, facilitating development systems.

Язык: Английский

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Recent advance and prospectives of electrocatalysts based on transition metal selenides for efficient water splitting

Nano Energy, Год журнала: 2020, Номер 78, С. 105234 - 105234

Опубликована: Авг. 5, 2020

Язык: Английский

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Copper–Nickel Nitride Nanosheets as Efficient Bifunctional Catalysts for Hydrazine‐Assisted Electrolytic Hydrogen Production

Advanced Energy Materials, Год журнала: 2019, Номер 9(21)

Опубликована: Апрель 10, 2019

Abstract Electrocatalytic water splitting is one of the sustainable and promising strategies to generate hydrogen fuel but still remains a great challenge because sluggish anodic oxygen evolution reaction (OER). A very effective approach dramatically decrease input cell voltage electrolysis replace OER with hydrazine oxidation (HzOR) due its lower thermodynamic potential. Therefore, developing low‐cost efficient HzOR catalysts, coupled cathodic (HER), tremendously important for energy‐saving electrolytic production. Herein, new‐type copper–nickel nitride (Cu 1 Ni 2 ‐N) rich Cu 4 N/Ni 3 N interface rationally constructed on carbon fiber cloth. The 3D electrode exhibits extraordinary HER performance an overpotential 71.4 mV at 10 mA cm −2 in 1.0 m KOH, simultaneously delivering ultralow potential 0.5 KOH/0.5 electrolyte. Moreover, utilizing synthesized ‐N as both cathode anode display 0.24 V excellent stability over 75 h. present work develops copper–nickel‐based bifunctional electrocatalyst through hydrazine‐assistance

Язык: Английский

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A High‐Efficiency CoSe Electrocatalyst with Hierarchical Porous Polyhedron Nanoarchitecture for Accelerating Polysulfides Conversion in Li–S Batteries

Advanced Materials, Год журнала: 2020, Номер 32(32)

Опубликована: Июнь 28, 2020

Lithium-sulfur (Li-S) batteries are recognized as promising candidates for next-generation electrochemical energy storage systems owing to their high density and cost-effective raw materials. However, the sluggish multielectron sulfur redox reactions root cause of most issues Li-S batteries. Herein, a high-efficiency CoSe electrocatalyst with hierarchical porous nanopolyhedron architecture (CS@HPP) derived from metal-organic framework is presented host The CS@HPP crystal quality abundant reaction active sites can catalytically accelerate capture/diffusion polysulfides precipitation/decomposition Li2 S. Thus, cathode exhibits an excellent capacity 1634.9 mAh g-1 , rate performance, long cycle life low decay 0.04% per over 1200 cycles. nanopolyhedrons further fabricated on carbon cloth (CC@CS@HPP) unfold electrocatalytic activity by its electrical conductivity large surface area. A freestanding CC@CS@HPP loading 8.1 mg cm-2 delivers areal under lean electrolyte. This work will enlighten rational design structure-catalysis engineering transition-metal-based nanomaterials diverse applications.

Язык: Английский

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A review on NiFe-based electrocatalysts for efficient alkaline oxygen evolution reaction

Journal of Power Sources, Год журнала: 2019, Номер 448, С. 227375 - 227375

Опубликована: Ноя. 13, 2019

Язык: Английский

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Interfacial engineering of the NiSe2/FeSe2 p-p heterojunction for promoting oxygen evolution reaction and electrocatalytic urea oxidation

Applied Catalysis B Environment and Energy, Год журнала: 2021, Номер 299, С. 120638 - 120638

Опубликована: Авг. 19, 2021

Язык: Английский

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