Bifunctional Electrocatalysts for Overall and Hybrid Water Splitting

Chemical Reviews, Journal Year: 2024, Volume and Issue: 124(7), P. 3694 - 3812

Published: March 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

Language: Английский

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3D Co₃O₄‐RuO₂ Hollow Spheres with Abundant Interfaces as Advanced Trifunctional Electrocatalyst for Water‐Splitting and Flexible Zn–Air Battery

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 32(38)

Published: July 12, 2022

Abstract Exploiting efficient and stable electrocatalysts with trifunctional catalytic activity toward hydrogen evolution reaction (HER), oxygen (OER), reduction (ORR) act has a crucial role sustainable energy development. Therefore, this study fabricates Co 3 O 4 ‐RuO 2 hollow spheres using facile eco‐friendly solvothermal low temperature oxidation procedure followed by ice water treatment (IW‐Co ‐HS). The specific nanostructure could provide sufficient active sites channels in the electrocatalytic procedure. Then, IW‐Co ‐HS presents small overpotentials HER (40 mV@ 10 mA cm −2 ) OER (250 ), high half‐wave potential for ORR (E 1/2 @ 0.79 V). Remarkably, also superior performances water‐splitting flexible rechargeable Zn–air batteries. Furthermore, electrolysis can be driven energy, including solar, wind, thermal assembled battery. This provides valid path to synthesize multifunctional on energy‐related devices.

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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Amorphous Ni(Ⅲ)-based sulfides as bifunctional water and urea oxidation anode electrocatalysts for hydrogen generation from urea-containing water

Applied Catalysis B Environment and Energy, Journal Year: 2022, Volume and Issue: 312, P. 121389 - 121389

Published: April 15, 2022

Language: Английский

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Modulating Local Interfacial Bonding Environment of Heterostructures for Energy‐Saving Hydrogen Production at High Current Densities

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(12)

Published: Jan. 8, 2023

Abstract Coupling urea oxidation reaction (UOR) with hydrogen evolution (HER) is an effective energy‐saving technique for generation. However, exploring efficient bifunctional electrocatalysts under high current density still challenging. Herein, hierarchical Fe doped cobalt selenide coupled FeCo layered double hydroxide (Fe‐Co 0.85 Se/FeCo LDH) array as a self‐supported superior heterojunction electrode rationally designed both UOR and HER. The unique heterostructure facilitates electron transfer interface interactions through local interfacial Co‐Se/O‐Fe bonding environment modulation, improving kinetics intrinsic activity. As result, the heterostructured electrocatalyst exhibits ultralow potentials of −0.274 1.48 V to reach 500 mA cm −2 catalyzing HER UOR, respectively. Particularly, full electrolysis system driven by Fe‐Co LDH delivers 300 at relatively low potential 1.57 V, which 150 mV lower than conventional water electrolysis. combination in situ characterization theoretical analysis reveal that active sites adjustable electronic are induced heterojunction, facilitating decomposition stabilization intermediates UOR. This work inspires modulation optimize advanced H 2 production.

Language: Английский

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Surface reconstruction and charge distribution enabling Ni/W5N4 Mott-Schottky heterojunction bifunctional electrocatalyst for efficient urea-assisted water electrolysis at a large current density

Applied Catalysis B Environment and Energy, Journal Year: 2022, Volume and Issue: 323, P. 122168 - 122168

Published: Nov. 11, 2022

Language: Английский

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High-Entropy Oxide Derived from Metal–Organic Framework as a Bifunctional Electrocatalyst for Efficient Urea Oxidation and Oxygen Evolution Reactions

ACS Applied Materials & Interfaces, Journal Year: 2022, Volume and Issue: 14(34), P. 38727 - 38738

Published: Aug. 16, 2022

High-entropy oxides (HEOs) offer unique features through a combination of incompatible metal cations to single crystalline lattice. Owing their special characteristics such as abundant cation compositions, high entropy stabilization, chemical and thermal stability, lattice distortion effect, they have drawn ever-increasing attention for various applications. However, very few studies been reported catalytic application, developing HEOs with large surface areas efficient application is still in infancy. Herein, we design nanostructured HEO (FeNiCoCrCu)3O4 using metal-organic frameworks (MOFs) sacrificial templates achieve area, density exposed active sites, more oxygen vacancies. Single-crystalline phase area 206 m2 g-1 are produced further applied bifunctional electrocatalysts the urea oxidation reaction (UOR) evolution (OER). Benefiting from enhanced vacancies optimized exhibited excellent electrocatalytic activity toward UOR low potential 1.35 V at current 10 mA cm-2 showed long-term stability 36 h operation, making significant performance over previously HEOs. Moreover, demonstrated an OER overpotential 270 mV Tafel slope 49 dec-1. The ascribed starting MOF precursor favorable high-entropy effect.

Language: Английский

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Hydrogen and value-added products yield from hybrid water electrolysis: A critical review on recent developments

Renewable and Sustainable Energy Reviews, Journal Year: 2023, Volume and Issue: 177, P. 113227 - 113227

Published: March 4, 2023

Language: Английский

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Revealing the Reactant Mediation Role of Low‐Valence Mo for Accelerated Urea‐Assisted Water Splitting

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 33(8)

Published: Dec. 9, 2022

Abstract Construction of bifunctional catalysts with balanced adsorption toward multiple reactants and intermediates is crucial for efficient urea‐assisted water splitting. Nickel Sulfide (NiS) considered as a promising choice both urea oxidation reaction (UOR) hydrogen evolution (HER), whereas the highly occupied d orbital Ni sites results in too weak reactant to achieve satisfactory bifunctionality. Herein, considering adsorption‐energy scaling limitations, another Mo 4+ site empty introduced into NiS crumpled nanoflowers mediator accelerated electrolysis. Based on situ characterizations theoretical calculations, dual‐center catalytic mechanism proposed that govern adsorption, subsequently cooperate nearby promote dissociation, intermediate formation, product desorption. The flower‐like nanostructure also provides abundant active rapid mass transfer. Consequently, Mo‐NiS exhibits excellent UOR/HER bifunctionality an anion‐exchange membrane (AEM) flow electrolyzer. Compared pure‐water electrolysis system, electrolyzer saves 15% energy produce hydrogen. Besides, this obtains ampere‐level current density 1 A cm −2 at cell voltage 2.0 V, about 2.56 times higher than assembly RuO 2 ||Pt/C, robust durability.

Language: Английский

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Machine Learning-Assisted Low-Dimensional Electrocatalysts Design for Hydrogen Evolution Reaction

Nano-Micro Letters, Journal Year: 2023, Volume and Issue: 15(1)

Published: Oct. 13, 2023

Abstract Efficient electrocatalysts are crucial for hydrogen generation from electrolyzing water. Nevertheless, the conventional "trial and error" method producing advanced is not only cost-ineffective but also time-consuming labor-intensive. Fortunately, advancement of machine learning brings new opportunities discovery design. By analyzing experimental theoretical data, can effectively predict their evolution reaction (HER) performance. This review summarizes recent developments in low-dimensional electrocatalysts, including zero-dimension nanoparticles nanoclusters, one-dimensional nanotubes nanowires, two-dimensional nanosheets, as well other electrocatalysts. In particular, effects descriptors algorithms on screening investigating HER performance highlighted. Finally, future directions perspectives electrocatalysis discussed, emphasizing potential to accelerate electrocatalyst discovery, optimize performance, provide insights into electrocatalytic mechanisms. Overall, this work offers an in-depth understanding current state its research.

Language: Английский

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