Oxygen Evolution/Reduction Reaction Catalysts: From In Situ Monitoring and Reaction Mechanisms to Rational Design

Chemical Reviews, Journal Year: 2023, Volume and Issue: 123(9), P. 6257 - 6358

Published: March 21, 2023

The oxygen evolution reaction (OER) and reduction (ORR) are core steps of various energy conversion storage systems. However, their sluggish kinetics, i.e., the demanding multielectron transfer processes, still render OER/ORR catalysts less efficient for practical applications. Moreover, complexity catalyst–electrolyte interface makes a comprehensive understanding intrinsic mechanisms challenging. Fortunately, recent advances in situ/operando characterization techniques have facilitated kinetic monitoring under conditions. Here we provide selected highlights mechanistic studies with main emphasis placed on heterogeneous systems (primarily discussing first-row transition metals which operate basic conditions), followed by brief outlook molecular catalysts. Key sections this review focused determination true active species, identification sites, reactive intermediates. For in-depth insights into above factors, short overview metrics accurate characterizations is provided. A combination obtained time-resolved information reliable activity data will then guide rational design new Strategies such as optimizing restructuring process well overcoming adsorption-energy scaling relations be discussed. Finally, pending current challenges prospects toward development homogeneous presented.

Language: Английский

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Nanostructured metal phosphides: from controllable synthesis to sustainable catalysis

Chemical Society Reviews, Journal Year: 2021, Volume and Issue: 50(13), P. 7539 - 7586

Published: Jan. 1, 2021

Metal phosphides (MPs) with unique and desirable physicochemical properties provide promising potential in implementable sustainable catalytic fields including electrocatalysis, photocatalysis, mild thermocatalysis, interdisciplinary hybrid systems.

Language: Английский

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Interface engineering of oxygen-vacancy-rich CoP/CeO2 heterostructure boosts oxygen evolution reaction

Chemical Engineering Journal, Journal Year: 2020, Volume and Issue: 395, P. 125160 - 125160

Published: April 22, 2020

Language: Английский

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Constructing a Hetero-interface Composed of Oxygen Vacancy-Enriched Co₃O₄ and Crystalline–Amorphous NiFe-LDH for Oxygen Evolution Reaction

ACS Catalysis, Journal Year: 2021, Volume and Issue: 11(23), P. 14338 - 14351

Published: Nov. 12, 2021

The development of high-performance electrocatalysts is a highly efficient strategy to optimize the sluggish kinetic property oxygen evolution reaction (OER). Herein, we synthesize kind nickel foam (NF)-supported electrocatalyst composed one-dimensional Co3O4 nanowire as core and two-dimensional NiFe-LDH nanosheet shell (denoted NiFe-60/Co3O4@NF). Fluorine introduced into precursor Co(OH)F Co3O4, which results in improved thermal stability significantly increased regularly distributed vacancies, while electrochemically deposited nanosheets possess crystalline/amorphous hybrid structure. As result, hetero-interface mainly constituting Ni species from contributes interaction between Co Fe facilitates electron transfer. Simultaneously, vacancies coordinatively unsaturated amorphous area also determined, finally completing backtracking. Benefiting these factors, only low overpotentials 221 257 mV are required deliver current densities 100 500 mA cm–2, respectively, with quite small Tafel slope 34.6 dec–1 during OER for well-designed NiFe-60/Co3O4@NF electrocatalyst.

Language: Английский

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Dual‐Phasic Carbon with Co Single Atoms and Nanoparticles as a Bifunctional Oxygen Electrocatalyst for Rechargeable Zn–Air Batteries

Advanced Functional Materials, Journal Year: 2021, Volume and Issue: 31(42)

Published: July 20, 2021

Abstract The great interest in rechargeable Zn–air batteries (ZABs) arouses extensive research on low‐cost, high‐active, and durable bifunctional electrocatalysts to boost the sluggish oxygen reduction reaction (ORR) evolution (OER). It remains a challenge simultaneously host high‐active independent ORR OER sites single catalyst. Herein dual‐phasic carbon nanoarchitecture consisting of single‐atom phase for nanosized is proposed. Specifically, Co atoms supported nanotubes (single‐atom phase) encapsulated zeolitic‐imidazole‐framework‐derived polyhedron (nanosized are integrated together via nanotube bridges. obtained catalyst shows small overpotential difference 0.74 V between potential at 10 mA cm −2 half‐wave potential. ZAB based demonstrates large power density 172 mW . Furthermore, it charge‐discharge gap 0.51 5 outstanding discharge‐charge cycling durability. This study provides feasible design concept achieve multifunctional catalysts promotes development ZABs.

Language: Английский

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Gd-induced electronic structure engineering of a NiFe-layered double hydroxide for efficient oxygen evolution

Journal of Materials Chemistry A, Journal Year: 2021, Volume and Issue: 9(5), P. 2999 - 3006

Published: Jan. 1, 2021

A novel rare earth hybrid electrocatalyst, consisting of a gadolinium-doped hierarchal NiFe-layered double hydroxide, is developed for improving the OER activity.

Language: Английский

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Interfacial electronic modulation by Fe2O3/NiFe-LDHs heterostructures for efficient oxygen evolution at high current density

Applied Catalysis B Environment and Energy, Journal Year: 2022, Volume and Issue: 306, P. 121097 - 121097

Published: Jan. 13, 2022

Language: Английский

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Oxygen Vacancy–Rich In‐Doped CoO/CoP Heterostructure as an Effective Air Cathode for Rechargeable Zn–Air Batteries

Small, Journal Year: 2019, Volume and Issue: 15(46)

Published: Sept. 27, 2019

Abstract An efficient and low‐cost electrocatalyst for reversible oxygen electrocatalysis is crucial improving the performance of rechargeable metal−air batteries. Herein, a novel vacancy–rich 2D porous In‐doped CoO/CoP heterostructure (In‐CoO/CoP FNS) designed developed by facile free radicals–induced strategy as an effective bifunctional Zn–air The electron spin resonance X‐ray absorption near edge spectroscopy provide clear evidence that abundant vacancies are formed in interface In‐CoO/CoP FNS. Owing to vacancies, heterostructure, multiple components, FNS exhibits excellent reduction reaction activity with positive half‐wave potential 0.81 V superior evolution low overpotential 365 mV at 10 mA cm −2 . Moreover, home‐made battery air cathode delivers large power density 139.4 mW , high energy 938 Wh kg Zn −1 can be steadily cycled over 130 h demonstrating great application metal–air

Language: Английский

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Gadolinium‐Induced Valence Structure Engineering for Enhanced Oxygen Electrocatalysis

Advanced Energy Materials, Journal Year: 2020, Volume and Issue: 10(10)

Published: Feb. 6, 2020

Abstract Rare earth doped materials with unique electronic ground state configurations are considered emerging alternatives to conventional Pt/C for the oxygen reduction reaction (ORR). Herein, gadolinium (Gd)‐induced valence structure engineering is, first, time investigated enhanced electrocatalysis. The Gd 2 O 3 –Co heterostructure loaded on N‐doped graphene (Gd –Co/NG) is constructed as target catalyst via a facile sol–gel assisted strategy. This synthetic strategy allows nanoparticles distribute uniformly an N‐graphene surface and form intimate /Co interface sites. Upon introduction of , ORR activity –Co/NG significantly increased compared Co/NG, where half‐wave potential (E 1/2 ) 100 mV more positive than that Co/NG even close commercial Pt/C. density functional theory calculation spectroscopic analysis demonstrate that, owing intrinsic charge redistribution at engineered /Co, coupled can break OOH*–OH* scaling relation result in good balance OOH* OH* binding surface. For practical application, rechargeable Zn–air battery employing air–cathode achieves large power excellent charge–discharge cycle stability.

Language: Английский

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Plasma‐induced Mo‐doped Co₃O₄ with enriched oxygen vacancies for electrocatalytic oxygen evolution in water splitting

Carbon Energy, Journal Year: 2022, Volume and Issue: 5(3)

Published: Oct. 27, 2022

Abstract Heteroatomic substitution and vacancy engineering of spinel oxides can theoretically optimize the oxygen evolution reaction (OER) through charge redistribution d ‐band center modification but still remain a great challenge in both preparation catalytic mechanism. Herein, we proposed novel efficient Ar‐plasma (P)‐assisted strategy to construct heteroatom Mo‐substituted vacancies enriched hierarchical Co 3 O 4 porous nanoneedle arrays situ grown on carbon cloth (denoted P‐Mo‐Co @CC) improve OER performance. technology efficiently generate sites at surface hydroxide, which induces anchoring Mo anion salts electrostatic interaction, finally facilitating atoms formation surface. The @CC affords low overpotential only 276 mV 10 mA cm −2 for OER, is 58 superior that Mo‐free surpasses commercial RuO 2 catalyst. robust stability satisfactory selectivity (nearly 100% Faradic efficiency) are also demonstrated. Theoretical studies demonstrate with variable valance states regulates atomic ratio 3+ /Co 2+ increases number vacancies, thereby inducing tuning , adsorption energy intermediates (e.g., *OOH) during OER. Furthermore, two‐electrode OER//HER electrolyzer equipped as anode displays operation potential 1.54 V deliver current density exhibits good reversibility anticurrent fluctuation ability under simulated real supply conditions, demonstrating water electrolysis.

Language: Английский

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