Recent Advances in Non‐Noble Bifunctional Oxygen Electrocatalysts toward Large‐Scale Production

Advanced Functional Materials, Journal Year: 2020, Volume and Issue: 30(27)

Published: April 27, 2020

Abstract The oxygen reduction reaction (ORR) and evolution (OER) are crucial reactions in energy conversion storage systems including fuel cells, metal–air batteries, electrolyzers. Developing low‐cost, high‐efficiency, durable non‐noble bifunctional electrocatalysts is the key to commercialization of these devices. Here, based on an in‐depth understanding ORR/OER mechanisms, recent advances development for reviewed. In particular, rational design enhancing activity stability scalable synthesis toward large‐scale production highlighted. Prospects future challenges field electrocatalysis presented.

Language: Английский

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Electronic Modulation of Non‐van der Waals 2D Electrocatalysts for Efficient Energy Conversion

Advanced Materials, Journal Year: 2021, Volume and Issue: 33(26)

Published: May 25, 2021

Abstract The exploration of efficient electrocatalysts for energy conversion is important green development. Owing to their high surface areas and unusual electronic structure, 2D have attracted increasing interest. Among them, non‐van der Waals (non‐vdW) materials with numerous chemical bonds in all three dimensions novel properties beyond those vdW been studied increasingly over the past decades. Herein, progress non‐vdW critically reviewed, a special emphasis on structure modulation. Strategies heteroatom doping, vacancy engineering, pore creation, alloying, heterostructure engineering are analyzed tuning structures achieving intrinsically enhanced electrocatalytic performances. Lastly, roadmap future development provided from material, mechanism, performance viewpoints.

Language: Английский

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Recent Progress of Vacancy Engineering for Electrochemical Energy Conversion Related Applications

Advanced Functional Materials, Journal Year: 2020, Volume and Issue: 31(9)

Published: Dec. 6, 2020

Abstract Efficient electrocatalysts are key requirements for the development of ecofriendly electrochemical energy‐related technologies and devices. It is widely recognized that introduction vacancies becoming an important valid strategy to promote electrocatalytic performances designed nanomaterials. In this review, significance (i.e., cationic vacancies, anionic mixed vacancies) on improvement via three main functionalities, including tuning electronic structure, regulating active sites, improving electrical conductivity, systematically discussed. Recent achievements in vacancy engineering various hotspot processes comprehensively summarized, with focus oxygen reduction reaction (ORR), evolution (OER), hydrogen (HER), nitrogen (NRR), CO 2 (CO RR), their further applications overall water‐splitting zinc–air battery The recent other also summarized. Finally, challenges prospects regulate different reactions

Language: Английский

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High valence metals engineering strategies of Fe/Co/Ni-based catalysts for boosted OER electrocatalysis

Journal of Energy Chemistry, Journal Year: 2022, Volume and Issue: 76, P. 195 - 213

Published: Sept. 16, 2022

Language: Английский

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Topotactically Transformed Polygonal Mesopores on Ternary Layered Double Hydroxides Exposing Under‐Coordinated Metal Centers for Accelerated Water Dissociation

Advanced Materials, Journal Year: 2020, Volume and Issue: 32(52)

Published: Nov. 13, 2020

Abstract Layered double hydroxides (LDHs) have been recognized as potent electrocatalysts for oxygen evolution reaction (OER), but are lacking in hydrogen (HER) activities due to the sluggish kinetics of water dissociation alkaline medium. Herein, aiming simultaneously bolster HER and OER kinetics, a metal–organic framework (MOF) mediated topotactic transformation tactic is deployed fabricate holey ternary CoFeNi LDHs on nickel foam, exposing polygonal mesopores with atomistic edge steps lattice defects. The optimized catalyst requires only an external voltage 1.49 V afford splitting current density 10 mA cm −2 apart from superb electrolytic stability, far surpassing benchmark Pt/C||RuO 2 couple. More importantly, mechanistic investigations utilizing advanced spectroscopies conjunction function theory (DFT) understandings unravel while synergetic effect among under‐coordinated metal centers lowers energy barrier dissociation, Fe‐doping enables further modulating d‐band states (DOS) Co Ni favor intermediates binding, thereby promoting intrinsic activity. Operando Raman studies reveal negligible structural change during process, whereas active sites can quickly turn into oxyhydroxides presence defects centers.

Language: Английский

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Spontaneously separated intermetallic Co3Mo from nanoporous copper as versatile electrocatalysts for highly efficient water splitting

Nature Communications, Journal Year: 2020, Volume and Issue: 11(1)

Published: June 10, 2020

Abstract Developing robust nonprecious electrocatalysts towards hydrogen/oxygen evolution reactions is crucial for widespread use of electrochemical water splitting in hydrogen production. Here, we report that intermetallic Co 3 Mo spontaneously separated from hierarchical nanoporous copper skeleton shows genuine potential as highly efficient alkaline virtue in-situ hydroxylation and electro-oxidation, respectively. The hydroxylated has an optimal hydrogen-binding energy to facilitate adsorption/desorption intermediates molecules. Associated with high electron/ion transport bicontinuous skeleton, supported electrodes exhibit impressive reaction catalysis, negligible onset overpotential low Tafel slope (~40 mV dec −1 ) 1 M KOH, realizing current density −400 mA cm −2 at 96 mV. When coupled its electro-oxidized derivative mediates efficiently oxygen reaction, their electrolyzer operates a superior overall water-splitting output, outperforming the one assembled noble-metal-based catalysts.

Language: Английский

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Tuning the electronic structure of the earth-abundant electrocatalysts for oxygen evolution reaction (OER) to achieve efficient alkaline water splitting – A review

Journal of Energy Chemistry, Journal Year: 2020, Volume and Issue: 56, P. 299 - 342

Published: Aug. 11, 2020

Language: Английский

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Corrosion Engineering on Iron Foam toward Efficiently Electrocatalytic Overall Water Splitting Powered by Sustainable Energy

Advanced Functional Materials, Journal Year: 2021, Volume and Issue: 31(17)

Published: Feb. 24, 2021

Abstract Exploiting highly effective and low‐cost electrocatalysts for the hydrogen evolution reaction (HER) is a pressing challenge development of sustainable energy. In this work, facile industrially compatible one‐pot corrosion strategy rapid synthesis amorphous RuO 2 ‐decorated FeOOH nanosheets on iron foam (FFNaRu) within 1 h reported. Corrosion common inevitable phenomenon that occurs metal surfaces without electricity input, high temperature, tedious synthetic procedures. The FFNaRu electrode superhydrophilic aerophobic, which guarantees intimate contact with electrolyte accelerates instantaneous escape produced gas bubbles during electrocatalytic process. Moreover, strong electronic interactions between promote process via dramatically improving electrochemical interfacial properties. Thus, electrocatalyst presents excellent catalytic activity towards HER (30 mV at 10 mA cm –2 ) overall water‐splitting (230 in M KOH. could be simply powered by intermittent sunlight, wind, thermal energies motivated Stirling engine. Density functional theory calculations confirm coupling effects are also responsible promoting performance.

Language: Английский

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Fe-doping induced morphological changes, oxygen vacancies and Ce³⁺–Ce³⁺ pairs in CeO₂ for promoting electrocatalytic nitrogen fixation

Journal of Materials Chemistry A, Journal Year: 2020, Volume and Issue: 8(12), P. 5865 - 5873

Published: Jan. 1, 2020

Fe-doping induced synergetic effects, including the morphological change of crystalline CeO₂ to partial-amorphous nanosheets, enriched O-vacancies and active Ce³⁺–Ce³⁺ pairs, were all responsible for significantly enhanced NRR activity Fe-CeO₂.

Language: Английский

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

Advanced Materials, Journal Year: 2021, Volume and Issue: 33(48)

Published: Sept. 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

Language: Английский

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