Non-iridium-based electrocatalyst for durable acidic oxygen evolution reaction in proton exchange membrane water electrolysis

Nature Materials, Год журнала: 2022, Номер 22(1), С. 100 - 108

Опубликована: Окт. 20, 2022

Язык: Английский

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Oxygen Evolution Reaction in Alkaline Environment: Material Challenges and Solutions

Advanced Functional Materials, Год журнала: 2022, Номер 32(21)

Опубликована: Март 13, 2022

Abstract The oxygen evolution reaction (OER) generally exists in electrochemistry‐enabled applications that are coupled with cathodic reactions like hydrogen evolution, carbon dioxide reduction, ammonia synthesis, and electrocatalytic hydrogenation. OER heavily impacts the overall energy efficiency of these devices because sluggish kinetics result a huge overpotential, thus, large amount efficient catalysts needed. benchmark iridium ruthenium (Ir/Ru)‐based materials (mostly used acid media) are, however, significantly limited by their scarcity. Non‐precious metal‐based (NPMCs) have emerged as most promising alternatives; they tend to degrade quickly under harsh operating conditions typical devices. Another challenge is unsatisfying performance when integrated real‐world Herein, active sites for three mainstream types NPMCs including non‐precious transition metal oxides/(oxy)hydroxides, metal‐free materials, hybrid composites reviewed. In addition, possible degradation mechanisms mitigation strategies discussed detail. This review also provides insights into gaps between R&D practical

Язык: Английский

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Stability and deactivation of OER electrocatalysts: A review

Journal of Energy Chemistry, Год журнала: 2022, Номер 69, С. 301 - 329

Опубликована: Янв. 29, 2022

Язык: Английский

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

Chemical Reviews, Год журнала: 2023, Номер 123(9), С. 6257 - 6358

Опубликована: Март 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.

Язык: Английский

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Electrochemical Water Splitting: Bridging the Gaps Between Fundamental Research and Industrial Applications

Energy & environment materials, Год журнала: 2022, Номер 6(5)

Опубликована: Май 28, 2022

Electrochemical water splitting represents one of the most promising technologies to produce green hydrogen, which can help realize goal achieving carbon neutrality. While substantial efforts on a laboratory scale have been made for understanding fundamental catalysis and developing high‐performance electrocatalysts two half‐reactions involved in electrocatalysis, much less attention has paid doing relevant research larger scale. For example, few such researches done an industrial Herein, we review very recent endeavors bridge gaps between applications electrolysis. We begin by introducing fundamentals electrochemical then present comparisons testing protocol, figure merit, catalyst interest, manufacturing cost industry‐based water‐electrolysis research. Special is tracking surface reconstruction process identifying real catalytic species under different conditions, highlight significant distinctions corresponding mechanisms. Advances designs industry‐relevant electrolysis are also summarized, reveal progress moving practical forward accelerating synergies material science engineering. Perspectives challenges electrocatalyst design strategies proposed finally further lab‐scale large‐scale electrocatalysis applications.

Язык: Английский

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Anion-exchange membrane water electrolyzers and fuel cells

Chemical Society Reviews, Год журнала: 2022, Номер 51(23), С. 9620 - 9693

Опубликована: Янв. 1, 2022

The key components, working management, and operating techniques of anion-exchange membrane water electrolyzers fuel cells are reviewed for the first time.

Язык: Английский

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Synergistic effect of multiple vacancies to induce lattice oxygen redox in NiFe-layered double hydroxide OER catalysts

Applied Catalysis B Environment and Energy, Год журнала: 2022, Номер 323, С. 122091 - 122091

Опубликована: Ноя. 3, 2022

Язык: Английский

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Unraveling oxygen vacancy site mechanism of Rh-doped RuO2 catalyst for long-lasting acidic water oxidation

Nature Communications, Год журнала: 2023, Номер 14(1)

Опубликована: Март 14, 2023

Exploring durable electrocatalysts with high activity for oxygen evolution reaction (OER) in acidic media is of paramount importance H2 production via polymer electrolyte membrane electrolyzers, yet it remains urgently challenging. Herein, we report a synergistic strategy Rh doping and surface vacancies to precisely regulate unconventional OER path the Ru-O-Rh active sites Rh-RuO2, simultaneously boosting intrinsic stability. The stabilized low-valent catalyst exhibits remarkable performance, an overpotential 161 mV at 10 mA cm-2 retention 99.2% exceeding 700 h 50 cm-2. Quasi situ/operando characterizations demonstrate recurrence reversible species under working potentials enhanced durability. It theoretically revealed that Rh-RuO2 passes through more optimal lattice mediated mechanism-oxygen vacancy site mechanism induced by interaction defects rate-determining step *O formation, breaking barrier limitation (*OOH) traditional adsorption mechanism.

Язык: Английский

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Coordination Symmetry Breaking of Single‐Atom Catalysts for Robust and Efficient Nitrate Electroreduction to Ammonia

Advanced Materials, Год журнала: 2022, Номер 34(36)

Опубликована: Июль 16, 2022

Nitrate electrocatalytic reduction (NO3 RR) for ammonia production is a promising strategy to close the N-cycle from nitration contamination, as well an alternative Haber-Bosch process with less energy consumption and carbon dioxide release. However, current long-term stability of NO3 RR catalysts usually tens hours, far requirements industrialization. Here, symmetry-broken Cusingle-atom are designed, catalytic activity retained after operation more than 2000 h, while average rate 27.84 mg h-1 cm-2 at industrial level density 366 mA achieved, obtaining good balance between stability. Coordination symmetry breaking achieved by embedding one Cu atom in graphene nanosheets two N O atoms cis-configuration, effectively lowering coordination symmetry, rendering active site polar, accumulating NO3- near electrocatalyst surface. Additionally, cis-coordination splits 3d orbitals, which generates orbital-symmetry-matched π-complex key intermediate *ONH reduces barrier, compared σ-complex generated other catalysts. These results reveal critical role single-atom catalysts, prompting design coordination-symmetry-broken electrocatalysts toward possible

Язык: Английский

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Construction of Zn-doped RuO2 nanowires for efficient and stable water oxidation in acidic media

Nature Communications, Год журнала: 2023, Номер 14(1)

Опубликована: Май 2, 2023

Abstract Oxygen evolution reaction catalysts capable of working efficiently in acidic media are highly demanded for the commercialization proton exchange membrane water electrolysis. Herein, we report a Zn-doped RuO 2 nanowire array electrocatalyst with outstanding catalytic performance oxygen under conditions. Overpotentials as low 173, 304, and 373 mV achieved at 10, 500, 1000 mA cm −2 , respectively, robust stability reaching to h 10 . Experimental theoretical investigations establish clear synergistic effect Zn dopants vacancies on regulating binding configurations oxygenated adsorbates active centers, which then enables an alternative Ru−Zn dual-site oxide path reaction. Due change pathways, energy barrier rate-determining step is reduced, over-oxidation Ru sites alleviated. As result, activity significantly enhanced.

Язык: Английский

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