Europium Oxide Evoked Multisite Synergism to Facilitate Water Dissociation for Alkaline Hydrogen Evolution

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: July 2, 2024

Abstract Exploring an efficient nonnoble metal catalyst for hydrogen evolution reaction (HER) is critical industrial alkaline water electrolysis. However, it remains a great challenge due to the additional energy required H─OH bond cleavage and lack of enough H 2 O adsorption sites most catalysts. Herein, integration oxophilic Eu 3 with NiCo alloy evoked multisite synergism facilitate dissociation HER proposed. The optimized ‐NiCo exhibits excellent activity low overpotential only 60 mV at 10 mA cm −2 good electrochemical stability, which superior that ‐free comparable benchmark Pt/C. key roles on enhanced performance are identified by in situ Raman spectroscopy theoretical calculations. It discovered strong oxophilicity facilitates breakage bonding while evoking electron redistribution /NiCo interface accelerating Volmer step HER. Furthermore, obtained as both anode cathode displays overall water‐splitting stability 1.0 M KOH solution. believed this study provides important inspiration design high‐performance electrocatalysts toward based rare‐earth materials.

Language: Английский

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Manipulating electron redistribution between iridium and Co₆Mo₆C bridging with a carbon layer leads to a significantly enhanced overall water splitting performance at industrial-level current density

Chemical Science, Journal Year: 2024, Volume and Issue: 15(30), P. 11890 - 11901

Published: Jan. 1, 2024

Ir nanoparticles on Co 6 Mo C nanofibers bridging with a carbon layer have been fabricated as efficient bifunctional electrocatalysts for water splitting, presenting ultrahigh electrocatalytic performance at ampere-level current density.

Language: Английский

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Ultrastable supported oxygen evolution electrocatalyst formed by ripening-induced embedding

Science, Journal Year: 2025, Volume and Issue: 387(6735), P. 791 - 796

Published: Jan. 2, 2025

The future deployment of terawatt-scale proton exchange membrane water electrolyzer (PEMWE) technology necessitates development an efficient oxygen evolution catalyst with low cost and long lifetime. Currently, the stability most active iridium (Ir) catalysts is impaired by dissolution, redeposition, detachment, agglomeration Ir species. Here we present a ripening-induced embedding strategy that securely embeds in cerium oxide support. Cryogenic electron tomography all-atom kinetic Monte Carlo simulations reveal synchronizing growth rate support nucleation Ir, regulated sonication, pivotal for successful synthesis. A PEMWE using this achieves cell voltage 1.72 volts at current density 3 amperes per square centimeter loading just 0.3 milligrams degradation 1.33 microvolts hour, as demonstrated 6000-hour accelerated aging test.

Language: Английский

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Ru-triggered domino effect constructs a local acid-like environment to achieve the ampere-level current density of a/c-Ru-FeP/IF electrode for alkaline HER

Applied Catalysis B Environment and Energy, Journal Year: 2025, Volume and Issue: unknown, P. 125030 - 125030

Published: Jan. 1, 2025

Language: Английский

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Revealing the Role of Ru‐O‐Ce Interface Coupling in CeO₂‐Ru Aerogel for Boosting Hydrogen Evolution Kinetics

Advanced Energy Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 10, 2025

Abstract Designing heterogeneous interface to enhance the kinetics for electrocatalysts is a highly efficient but challenging pathway toward hydrogen evolution reaction (HER) in water electrolysis. Herein, coupling of CeO 2 quantum dots onto porous Ru aerogel through interfacial Ru‐O‐Ce bridge proposed construct ‐Ru as superior HER electrocatalyst with ultra‐low overpotentials. In situ characterizations and theoretical calculations reveal electron distribution at boost bonding sites, faster adsorption dissociation sites kinetics. Furthermore, employed excellent cathodes both acidic alkaline electrolyzers ampere‐level current density stably operated over 500 hours. Thus, synergistic effect tunes catalytic mechanism reinforces activity, realizing generation

Language: Английский

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In‐situ Reconstruction of Catalyst in Electrocatalysis

Advanced Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 22, 2024

Abstract Reconstruction of catalysts is now well recognized as a common phenomenon in electrocatalysis. As the reconstructed structure may promote or hamper electrochemical performance, how to achieve designed active surface for highly enhanced catalytic activity through reconstruction needs be carefully investigated. In this review, genesis and effects various processes, such hydrogen evolution reaction (HER), oxygen (OER), carbon dioxide reduction (CO 2 RR), nitrate (NO 3 RR) are first described. Then, strategies optimizing reconstruction, valence states control, phase retention, engineering, poisoning prevention comprehensively discussed. Finally, general rules optimization summarized give perspectives future study. It believed that review shall provide deep insights into electrocatalytic mechanisms guide design pre‐catalysts with improved activity.

Language: Английский

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Unlocking the potential of hematite photoanodes in acidic electrolytes: Boosting performance with ultra‐small IrO_x nanoparticles for efficient water splitting

EcoEnergy, Journal Year: 2024, Volume and Issue: 2(2), P. 322 - 335

Published: May 25, 2024

Abstract Photoelectrochemical (PEC) water splitting offers a promising route for harnessing solar energy to produce clean hydrogen fuel sustainably. A major hurdle has been boosting the performance of photoanode materials within acidic electrolytes—a critical aspect advancing PEC technology. In response this challenge, we report method augment efficacy hematite photoanodes under conditions by anchoring IrO x nanoparticles, replete with hydroxyl groups, onto their surface. remarkable and steady photocurrent density 1.71 mA cm −2 at 1.23 V versus RHE was achieved, marking significant leap in efficiency media. The introduction layer notably expanded electrochemically active surface area more sites, fostering improved charge separation transfer. It also served as an effective hole capture layer, drawing photogenerated holes from facilitate swift migration sites oxidation process. This advancement potential fully harness capabilities environments, thereby smoothing path toward sustainable production through splitting.

Language: Английский

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Stabilizing Oxidation State of Cu via Ce Doping into La₂CuO₄ for Enhanced Electroreduction of CO₂ to Multicarbon Products

Small Methods, Journal Year: 2025, Volume and Issue: unknown

Published: March 4, 2025

Stabilizing oxidation state of Cu (Cuδ+, δ > 0) sites is the key-enabling issue for electrocatalytic carbon dioxide (CO2) reduction reaction (eCO2RR) to multicarbon (C2+) products. The present study addresses this challenge by introducing cerium (Ce) doping into La2CuO4. Ce facilitates f-d orbital coupling between 4f and 3d orbitals, suppressing electron enrichment around atoms transferring electrons from orbitals via a Cu-O-Ce chain. These changes modulate electronic structure Cu, reduce distance neighboring atoms, optimize binding energy surface-adsorbed CO (*CO), lower barrier *CO dimerization. As result, La1.95Ce0.05CuO4 catalyst achieves Faradaic efficiency up 81% C2+ products maintains high stability over 50 h operation. This work highlights unique role in stabilizing Cuδ+ hence enhancing C-C coupling, providing pathway designing efficient catalysts eCO2RR.

Language: Английский

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Manganese as Electron Reservoir Stabilized RuMnO_x@RuO_x with Enhanced Activity and Robust Durability for Acidic Water Oxidation

ACS Catalysis, Journal Year: 2024, Volume and Issue: 14(17)

Published: Aug. 14, 2024

Designing highly active and durable electrocatalysts with low noble-metal mass-loading to boost the sluggish oxygen evolution reaction is crucial for hydrogen production. Herein, a Ru-enriched surface oxygen-defective [email protected] catalyst developed enhanced activity robust stability through MnOx serving as an electron reservoir. This ultralow of 91.2 μgRu cm−2 delivers 1645 A gRu−[email protected] V versus RHE long-term operational exceeding 240 h high number (6.22 × 104) in 0.5 M H2SO4. Characterizations theoretical calculations reveal that sacrificial spaced Mn dissolution makes adjacent serve reservoir replenish electrons on Ru sites suppress overoxidation extending stability. The crystalline−amorphous heterointerfaces, abundant vacancies, stable Ru−O−Mn motifs simultaneously facilitate superior activity. weaker adsorption between oxo-intermediates lowers energy barrier from O* *OOH following adsorbate mechanism (AEM) pathway. work provides promising perspective designing cost-effective OER proton exchange membrane water electrolysis.

Language: Английский

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Promoting Oxygen Evolution Electrocatalysis by Coordination Engineering in Cobalt Phosphate

Small, Journal Year: 2024, Volume and Issue: unknown

Published: May 21, 2024

Abstract Understanding the structure‐activity correlation is an important prerequisite for rational design of high‐efficiency electrocatalysts at atomic level. However, effect coordination environment on electrocatalytic oxygen evolution reaction (OER) remains enigmatic. In this work, regulation proton transfer involved in water oxidation by engineering based Co 3 (PO 4 ) 2 and CoHPO reported. The HPO 2− anion has intermediate p K a value between Co(II)‐H O Co(III)‐H to be served as appealing proton‐coupled electron (PCET) induction group. From theoretical calculations, pH‐dependent OER properties, deuterium kinetic isotope effects, operando electrochemical impedance spectroscopy (EIS) Raman studies, catalyst beneficially reduces energy barrier hopping modulates formation high‐valent species, thereby enhancing activity. This work demonstrates promising strategy that involves tuning local optimize PCET steps activities applications. addition, designed system offers motif understand structure‐efficiency relationship from those amino‐acid residue with buffer ability natural photosynthesis.

Language: Английский

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