Water electrolysis for hydrogen production: from hybrid systems to self-powered/catalyzed devices

Energy & Environmental Science, Journal Year: 2023, Volume and Issue: 17(1), P. 49 - 113

Published: Nov. 7, 2023

This perspective highlights recent advancements in innovative strategies to provide valuable insights into the potential for energy-saving hydrogen production through water electrolysis.

Language: Английский

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Defect Engineered Metal–Organic Framework with Accelerated Structural Transformation for Efficient Oxygen Evolution Reaction

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(43)

Published: Sept. 6, 2023

Metal-organic frameworks (MOFs) have been increasingly applied in oxygen evolution reaction (OER), and the surface of MOFs usually undergoes structural transformation to form metal oxyhydroxides serve as catalytically active sites. However, controllable regulation reconstruction process remains a great challenge. Here we report defect engineering strategy facilitate during OER with enhanced activity. Defective (denoted NiFc'x Fc1-x ) abundant unsaturated sites are constructed by mixing ligands 1,1'-ferrocene dicarboxylic acid (Fc') defective ferrocene carboxylic (Fc). series more prone be transformed compared non-defective (NiFc'). Moreover, as-formed derived from contain vacancies. NiFc'Fc grown on nickel foam exhibits excellent catalytic activity an overpotential 213 mV at current density 100 mA cm-2 , superior that undefective NiFc'. Experimental results theoretical calculations suggest vacancies adsorption oxygen-containing intermediates centers, thus significantly improving

Language: Английский

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Nanoreactors Encapsulating Built‐in Electric Field as a “Bridge” for Li–S Batteries: Directional Migration and Rapid Conversion of Polysulfides

Advanced Energy Materials, Journal Year: 2023, Volume and Issue: 14(9)

Published: Dec. 27, 2023

Abstract Lithium–sulfur batteries (Li–S) are recognized as the next generation of secondary due to their satisfactory theoretical specific capacity and energy density. However, a series problems such disordered migration behavior, sluggish redox kinetics, serious shuttle effect lithium polysulfides (LiPSs) greatly limit commercial application. Herein, nanoreactors encapsulate heterostructure guarantee sulfur conversion in hosts where consists FeP with moderate adsorption ability, excellent catalytic active low work function, Fe 3 O 4 strong ability high function. This rational configuration controls direction interface built‐in electric field (BIEF) between catalyst adsorbent, realizing successive “trapping‐directional migration‐conversion” reaction mechanism species. Thanks BIEF bridge connect trapping site site, /FeP@C─S cathode delivers an ultrahigh initial 1402 mAh g −1 at 0.1 C remains more than 450 5 after 350 cycles. Even loading 5.20 mg cm −2 , it displayed 970 . provided effective strategy design high‐performance electrocatalysts for Li–S batteries.

Language: Английский

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Regulating Hydrogen/Oxygen Species Adsorption via Built‐in Electric Field ‐Driven Electron Transfer Behavior at the Heterointerface for Efficient Water Splitting

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(16)

Published: Feb. 29, 2024

Abstract Alkaline water electrolysis (AWE) plays a crucial role in the realization of hydrogen economy. The design and development efficient stable bifunctional catalysts for both evolution reaction (HER) oxygen (OER) are pivotal to achieving high‐efficiency AWE. Herein, WC 1‐x /Mo 2 C nanoparticle‐embedded carbon nanofiber (WC C@CNF) with abundant interfaces is successfully designed synthesized. Benefiting from electron transfer behavior Mo , electrocatalysts C@CNF exhibit superior HER OER performance. Furthermore, when employed as anode cathode membrane electrode assembly devices, catalyst exhibits enhanced catalytic activity remarkable stability 100 hours at high current density 200 mA cm −2 towards overall splitting. experimental characterizations theoretical simulation reveal that modulation d‐band center C@CNF, achieved through asymmetric charge distribution resulting built‐in electric field induced by work function, enables optimization adsorption strength hydrogen/oxygen intermediates, thereby promoting kinetics This provides promising strategies designing highly active energy conversion fields.

Language: Английский

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Manipulating Electron Redistribution in Ni₂P for Enhanced Alkaline Seawater Electrolysis

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(1)

Published: Sept. 23, 2023

Abstract Developing bifunctional electrocatalyst for seawater splitting remains a persistent challenge. Herein, an approach is proposed through density functional theory (DFT) preanalysis to manipulate electron redistribution in Ni 2 P addressed by cation doping and vacancy engineering. The needle‐like Fe‐doped with (Fe‐Ni Pv) successfully synthesized on nickel foam, exhibiting superior hydrogen evolution reaction (HER) oxygen (OER) catalytic activity electrolysis alkaline condition. As result, Fe‐Ni Pv achieves the industrially required current densities of 1.0 3.0 A cm −2 at low voltages 1.68 1.73 V, respectively, 60 °C 6.0 m KOH circumstances. theoretical calculation experimental results collectively reveal reasons enhancement catalyst activity. Specifically, Fe vacancies can accelerate reconstruction OER active species optimize adsorption free energy (Δ G H* ) HER. In addition, sites are identified, where greatly improve electrical conductivity dominant centers, meanwhile atoms as centers study provides deep insight into exploration nickel‐based phosphide catalysts identification their real centers.

Language: Английский

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Modulating Metal‐Nitrogen Coupling in Anti‐Perovskite Nitride via Cation Doping for Efficient Reduction of Nitrate to Ammonia

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(38)

Published: Aug. 1, 2023

The complexes of metal center and nitrogen ligands are the most representative systems for catalyzing hydrogenation reactions in small molecule conversion. Developing heterogeneous catalysts with similar active metal-nitrogen functional centers, nevertheless, still remains challenging. In this work, we demonstrate that coupling anti-perovskite Co4 N can be effective modulated by Cu doping to form Co3 CuN, leading strongly promoted process during electrochemical reduction nitrate (NO3- RR) ammonia. combination advanced spectroscopic techniques density theory calculations reveal dopants strengthen Co-N bond upshifted d-band towards Fermi level, promoting adsorption NO3- *H facilitating transition from *NO2 /*NO H/*NOH. Consequently, CuN delivers noticeably better RR activity than pristine N, optimal Faradaic efficiency 97 % ammonia yield 455.3 mmol h-1 cm-2 at -0.3 V vs. RHE. This work provides an strategy developing high-performance catalyst synthesis.

Language: Английский

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Inverse doping IrOx/Ti with weakened Ir-O interaction toward stable and efficient acidic oxygen evolution

Chem, Journal Year: 2023, Volume and Issue: 9(10), P. 2931 - 2942

Published: July 5, 2023

Language: Английский

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Work Function‐Guided Electrocatalyst Design

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(29)

Published: April 29, 2024

Abstract The development of high‐performance electrocatalysts for energy conversion reactions is crucial advancing global sustainability. design catalysts based on their electronic properties (e.g., work function) has gained significant attention recently. Although numerous reviews electrocatalysis have been provided, no such reports function‐guided electrocatalyst are available. Herein, a comprehensive summary the latest advancements in diverse electrochemical applications provided. This includes function‐based catalytic activity descriptors, and both monolithic heterostructural catalysts. measurement function first discussed descriptors various fully analyzed. Subsequently, function‐regulated material‐electrolyte interfacial electron transfer (IET) employed catalyst design, methods regulating optimizing performance discussed. In addition, key strategies tuning function‐governed material‐material IET examined. Finally, perspectives determination, put forward to guide future research. paves way rational efficient sustainable applications.

Language: Английский

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Metal‐Organic Framework‐Based Electrocatalysts for Acidic Water Splitting

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(34)

Published: March 13, 2024

Abstract The proton exchange membrane water electrolysis system has long been considered a promising technique for the generation of hydrogen owing to its high electrolytic efficiency, reliability, and quick response renewable energy sources. At present, noble metals their oxides (e.g., Pt, IrO 2 , RuO ) are widely used as active electrocatalysts accelerating conversion efficiency process, especially in acidic media. Nevertheless, scarcity instability seriously impede large‐scale application practice. In past years, metal‐organic frameworks (MOFs) have proven be an ideal platform designing efficient cost‐effective electrodes due unique physicochemical properties. this review, fundamental catalytic mechanisms evolution reaction (HER) oxygen (OER) media discussed first. Then, design strategies advanced characterizations MOF‐based water‐splitting catalysts summarized. Finally, recent research advances HER OER electrolytes, along with current challenges future opportunities, provided.

Language: Английский

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Activating lattice oxygen by a defect-engineered Fe₂O₃–CeO₂ nano-heterojunction for efficient electrochemical water oxidation

Energy & Environmental Science, Journal Year: 2024, Volume and Issue: 17(14), P. 5260 - 5272

Published: Jan. 1, 2024

Self-supporting Fe 2 O 3 –CeO nano-heterojunction electrodes with rich oxygen vacancies present high catalytic performance for evolution reaction, where defect-engineering promotes the interfacial interaction and activates lattice oxygens.

Language: Английский

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