Bifunctional Electrocatalysts for Overall and Hybrid Water Splitting

Chemical Reviews, Год журнала: 2024, Номер 124(7), С. 3694 - 3812

Опубликована: Март 22, 2024

Electrocatalytic water splitting driven by renewable electricity has been recognized as a promising approach for green hydrogen production. Different from conventional strategies in developing electrocatalysts the two half-reactions of (e.g., and oxygen evolution reactions, HER OER) separately, there growing interest designing bifunctional electrocatalysts, which are able to catalyze both OER. In addition, considering high overpotentials required OER while limited value produced oxygen, is another rapidly exploring alternative oxidation reactions replace hybrid toward energy-efficient generation. This Review begins with an introduction on fundamental aspects splitting, followed thorough discussion various physicochemical characterization techniques that frequently employed probing active sites, emphasis reconstruction during redox electrolysis. The design, synthesis, performance diverse based noble metals, nonprecious metal-free nanocarbons, overall acidic alkaline electrolytes, thoroughly summarized compared. Next, their application also presented, wherein anodic include sacrificing agents oxidation, pollutants oxidative degradation, organics upgrading. Finally, concise statement current challenges future opportunities presented hope guiding endeavors quest sustainable

Язык: Английский

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Atomically dispersed materials: Ideal catalysts in atomic era

Nano Research, Год журнала: 2023, Номер 17(1), С. 18 - 38

Опубликована: Май 25, 2023

Язык: Английский

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Valence Oscillation of Ru Active Sites for Efficient and Robust Acidic Water Oxidation

Advanced Materials, Год журнала: 2023, Номер 35(48)

Опубликована: Сен. 6, 2023

The continuous oxidation and leachability of active sites in Ru-based catalysts hinder practical application proton-exchange membrane water electrolyzers (PEMWE). Herein, robust inter-doped tungsten-ruthenium oxide heterostructures [(Ru-W)Ox ] fabricated by sequential rapid metal thermomigration processes are proposed to enhance the activity stability acidic oxygen evolution reaction (OER). introduction high-valent W species induces valence oscillation Ru during OER, facilitating cyclic transition states maintaining operation sites. preferential electronic gain heterostructure significantly stabilize RuOx on WOx substrates beyond Pourbaix limit bare RuO2 . Furthermore, asymmetric Ru-O-W units generated around interface adsorb intermediates synergistically, enhancing intrinsic OER activity. Consequently, (Ru-W)Ox not only demonstrate an overpotential 170 mV at 10 mA cm-2 excellent 300 h electrolytes but also exhibit potential for applications, as evidenced stable 0.5 A PEMWE.

Язык: Английский

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Advanced electrocatalysts with unusual active sites for electrochemical water splitting

InfoMat, Год журнала: 2023, Номер 6(1)

Опубликована: Ноя. 27, 2023

Abstract Electrochemical water splitting represents a promising technology for green hydrogen production. To design advanced electrocatalysts, it is crucial to identify their active sites and interpret the relationship between structures performance. Materials extensively studied as electrocatalysts include noble‐metal‐based (e.g., Ru, Ir, Pt) non‐noble‐metal‐based 3d transition metals) compounds. Recently, advancements in characterization techniques theoretical calculations have revealed novel unusual sites. The present review highlights latest achievements discovery identification of various unconventional electrochemical splitting, with focus on state‐of‐the‐art strategies determining true establishing structure–activity relationships. Furthermore, we discuss remaining challenges future perspectives development next‐generation By presenting fresh perspective reaction involved this aims provide valuable guidance study industrial applications. image

Язык: Английский

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Lanthanide-regulating Ru-O covalency optimizes acidic oxygen evolution electrocatalysis

Nature Communications, Год журнала: 2024, Номер 15(1)

Опубликована: Июнь 11, 2024

Abstract Precisely modulating the Ru-O covalency in RuO x for enhanced stability proton exchange membrane water electrolysis is highly desired. However, transition metals with d -valence electrons, which were doped into or alloyed , are inherently susceptible to influence of coordination environment, making it challenging modulate a precise and continuous manner. Here, we first deduce that introduction lanthanide gradually changing electronic configurations can continuously owing shielding effect 5 s /5 p orbitals. Theoretical calculations confirm durability Ln-RuO following volcanic trend as function covalency. Among various Er-RuO identified optimal catalyst possesses 35.5 times higher than 2 . Particularly, -based device requires only 1.837 V reach 3 A cm −2 shows long-term at 500 mA 100 h degradation rate mere 37 μV −1

Язык: Английский

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RuO₂–CeO₂ Lattice Matching Strategy Enables Robust Water Oxidation Electrocatalysis in Acidic Media via Two Distinct Oxygen Evolution Mechanisms

ACS Catalysis, Год журнала: 2024, Номер 14(5), С. 3298 - 3307

Опубликована: Фев. 15, 2024

The discovery of acid-stable and highly active electrocatalysts for the oxygen evolution reaction (OER) is crucial in quest high-performance water-splitting technologies. Herein, a heterostructured RuO2–CeO2 electrocatalyst was constructed by using lattice-matching strategy. interfacial Ru–O–Ce bridge structure provided channel electron transfer between Ru Ce, creating lattice stress that distorts local RuO2. resulting catalyst exhibited attractive stability with negligible decay after 1000 h OER 0.5 M H2SO4, along high activity an overpotential only 180 mV at 10 mA cm–2. In situ attenuated total reflectance surface-enhanced infrared absorption spectroscopy (ATR-SEIRAS), differential electrochemical mass spectrometry (DEMS), density functional theory (DFT) calculations were used to reveal interface noninterface RuO2 sites enabled oxide path mechanism (OPM) enhanced adsorbate (AEM-plus), respectively, during OER. simultaneous independent pathways accessible matching guides improved design acidic media.

Язык: Английский

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Ru/Ir‐Based Electrocatalysts for Oxygen Evolution Reaction in Acidic Conditions: From Mechanisms, Optimizations to Challenges

Advanced Science, Год журнала: 2024, Номер 11(21)

Опубликована: Март 19, 2024

Abstract The generation of green hydrogen by water splitting is identified as a key strategic energy technology, and proton exchange membrane electrolysis (PEMWE) one the desirable technologies for converting renewable sources into hydrogen. However, harsh anode environment PEMWE oxygen evolution reaction (OER) involving four‐electron transfer result in large overpotential, which limits overall efficiency production, thus efficient electrocatalysts are needed to overcome high overpotential slow kinetic process. In recent years, noble metal‐based (e.g., Ru/Ir‐based metal/oxide electrocatalysts) have received much attention due their unique catalytic properties, already become dominant acidic OER process applied commercial devices. these still face thorny problem conflicting performance cost. this review, first, metal briefly classified according forms existence, mechanisms outlined. Then, focus on summarizing improvement strategies with respect activity stability over years. Finally, challenges development prospects discussed.

Язык: Английский

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Next-Generation Green Hydrogen: Progress and Perspective from Electricity, Catalyst to Electrolyte in Electrocatalytic Water Splitting

Nano-Micro Letters, Год журнала: 2024, Номер 16(1)

Опубликована: Июль 5, 2024

Green hydrogen from electrolysis of water has attracted widespread attention as a renewable power source. Among several production methods, it become the most promising technology. However, there is no large-scale system currently that can compete with conventional fossil fuel production. Renewable energy electrocatalytic splitting an ideal technology environmental cleanliness protection and good purity, which meet requirements future development. This review summarizes introduces current status by three aspects: electricity, catalyst electrolyte. In particular, present situation latest progress key sources power, catalytic materials electrolyzers for are introduced. Finally, problems generation electrolytic directions next-generation green in discussed outlooked. It expected this will have important impact on field water.

Язык: Английский

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Unraveling Quantum Mysteries: Probing the Interplay of CdS Quantum Dots and g-C₃N₄ Nanosheets for Enhanced Photo/Electrocatalytic Hydrogen Evolution

The Journal of Physical Chemistry C, Год журнала: 2023, Номер 128(1), С. 85 - 94

Опубликована: Дек. 27, 2023

A series of CdS quantum dots (QDs) at low temperature were grown on the nanosheets (NSs) g-C3N4 through an in situ successive ionic layer adsorption and reaction process. The visible light active band gap ultrathin NSs has attracted more attention due to its essential bandgap for water splitting reaction. However, a single catalyst with limited number sites does not exhibit significant photo/electrocatalytic activity hydrogen production. In current strategies, development photogenerated charge transfer-driven type-II QDs/g-C3N4 heterostructure demonstrates enhanced evolution amount 14.8 mmol gcat–1 H2 gas AQY 27.6% as result decreased transfer resistance significantly increased electrochemical surface area. Additionally, as-prepared shown overpotentials 182 382 mV (HER) oxygen (OER) reactions reach density 10 mA cm–2, respectively. addition, bifunctional electrocatalyst exhibits 4- 6-fold higher mass material OER HER compared g-C3N4, considerable faradaic efficiency under potentiostatic system, Moreover, remarkable was well explained photoluminescence quenching effect Mott–Schottky analysis.

Язык: Английский

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Iron Oxyhydroxide: Structure and Applications in Electrocatalytic Oxygen Evolution Reaction

Advanced Functional Materials, Год журнала: 2023, Номер 33(25)

Опубликована: Март 10, 2023

Abstract Oxygen evolution reaction (OER) is the anodic half‐reaction for crucial energy devices, such as water electrolysis, metal–air battery, and electrochemical CO 2 reduction. Fe‐based materials are recognized one of most promising electrocatalysts OER because its extremely low price high activity. In particular, iron oxyhydroxide (FeOOH) not only highly active toward OER, but also widely accepted true species plenty converted into FeOOH during test. Herein, recent advances FeOOH‐based nano‐structure application in reviewed. The relationship between structure catalytic performance, followed by introduction current strategies enhancing activity (i.e., crystalline phase engineering, element doping, construction hybrid materials) mainly focused. Finally, a summary perspective about remaining challenges future opportunities this area further design provided.

Язык: Английский

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