Waste-Derived Catalysts for Water Electrolysis: Circular Economy-Driven Sustainable Green Hydrogen Energy

Nano-Micro Letters, Год журнала: 2022, Номер 15(1)

Опубликована: Дек. 1, 2022

The sustainable production of green hydrogen via water electrolysis necessitates cost-effective electrocatalysts. By following the circular economy principle, utilization waste-derived catalysts significantly promotes development energy. Currently, diverse have exhibited excellent catalytic performance toward evolution reaction (HER), oxygen (OER), and overall (OWE). Herein, we systematically examine recent achievements in electrocatalysts for electrolysis. general principles design efficient are discussed, followed by illustration current strategies transforming wastes into Then, applications (i.e., carbon-based catalysts, transitional metal-based heterostructure catalysts) HER, OER, OWE reviewed successively. An emphasis is put on correlating catalysts' structure-performance relationship. Also, challenges research directions this booming field finally highlighted. This review would provide useful insights design, synthesis, electrocatalysts, thus accelerate economy-driven energy scheme.

Язык: Английский

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Coupling Adsorbed Evolution and Lattice Oxygen Mechanism in Fe‐Co(OH)₂/Fe₂O₃ Heterostructure for Enhanced Electrochemical Water Oxidation

Advanced Functional Materials, Год журнала: 2023, Номер 33(45)

Опубликована: Сен. 1, 2023

Abstract Oxygen evolution reaction (OER) remains a bottleneck for electrocatalytic water‐splitting to generate hydrogen. However, the traditional adsorbed mechanism (AEM) possesses sluggish kinetics due scaling relationship, while lattice oxygen (LOM) triggers an unstable structure escaping of oxygen. Herein, proof‐of‐concept Fe‐Co(OH) 2 /Fe O 3 heterostructure is put forward, where following AEM can complete rapidly deprotonation process Fe LOM trigger O─O coupling step. Combining theoretical and experimental investigation confirmed that redistributed space‐charge junction optimize synergistically oxygen, facilitate synchronously OER activity stability. As result, shows excellent performance with low overpotential only 219 249 mV reach current density 10 100 mA cm −2 . Specifically, electrocatalyst maintains long‐term stability h at large This work paves avenue break through limit conventional mechanism.

Язык: Английский

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Unlocking the Transition of Electrochemical Water Oxidation Mechanism Induced by Heteroatom Doping

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(40)

Опубликована: Авг. 15, 2023

Abstract Heteroatom doping has emerged as a highly effective strategy to enhance the activity of metal‐based electrocatalysts toward oxygen evolution reaction (OER). It is widely accepted that does not switch OER mechanism from adsorbate (AEM) lattice‐oxygen‐mediated (LOM), and enhanced attributed optimized binding energies intermediates. However, this seems inconsistent with fact overpotential doped (<300 mV) considerably smaller than limit AEM (>370 mV). To determine origin inconsistency, we select phosphorus (P)‐doped nickel‐iron mixed oxides model observe enhances covalency metal‐oxygen bonds drive pathway transition LOM, thereby breaking adsorption linear relation between *OH *OOH in AEM. Consequently, obtained P‐doped display small 237 mV at 10 mA cm −2 . Beyond P, similar also observed on sulfur doping. These findings offer new insights into substantially originating heteroatom

Язык: Английский

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Recent Advances on Transition‐Metal‐Based Layered Double Hydroxides Nanosheets for Electrocatalytic Energy Conversion

Advanced Science, Год журнала: 2023, Номер 10(13)

Опубликована: Март 3, 2023

Abstract Transition‐metal‐based layered double hydroxides (TM‐LDHs) nanosheets are promising electrocatalysts in the renewable electrochemical energy conversion system, which regarded as alternatives to noble metal‐based materials. In this review, recent advances on effective and facile strategies rationally design TM‐LDHs electrocatalysts, such increasing number of active sties, improving utilization sites (atomic‐scale catalysts), modulating electron configurations, controlling lattice facets, summarized compared. Then, these fabricated for oxygen evolution reaction, hydrogen urea oxidation nitrogen reduction small molecule oxidations, biomass derivatives upgrading is articulated through systematically discussing corresponding fundamental principles reaction mechanism. Finally, existing challenges density catalytically future prospects nanosheets‐based each application also commented.

Язык: Английский

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Recent developments of iridium-based catalysts for the oxygen evolution reaction in acidic water electrolysis

Journal of Materials Chemistry A, Год журнала: 2022, Номер 10(25), С. 13170 - 13189

Опубликована: Янв. 1, 2022

Advanced optimization strategies for Ir-based oxygen evolution catalysts include morphological regulation, heteroatomic doping, crystal phase control, and support introduction.

Язык: Английский

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