In Situ Reconstructed Ru Clusters on LaRuSi₃ with Enhanced Electrocatalytic Activity for Alkaline Hydrogen Evolution

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(44)

Published: May 21, 2024

Abstract The surface reconstruction of electrochemically activated catalysts is an effective way to improve performance. However, there currently a dearth study on the silicide for hydrogen evolution reactions (HER). Here, new HER electrocatalyst, LaRuSi 3 , synthesized and triggered it produce Ru clusters its surface. Experimental data theoretical simulations reveal that optimize charge distribution which promotes adsorption water by sites improves Si sites. conductivity electrochemical active are also enhanced. catalyst has overpotential 45 mV attain current density 10 mA cm −2 in alkaline media, exceeds majority other Ru‐based compounds. This work contributes exploration more efficient novel silicides electrocatalysts broadens application techniques.

Language: Английский

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A Durable and High‐Voltage Mn–Graphite Dual‐Ion Battery Using Mn‐Based Hybrid Electrolytes

Small, Journal Year: 2024, Volume and Issue: 20(28)

Published: Jan. 29, 2024

Abstract Rechargeable Mn–metal batteries (MMBs) can attract considerable attention because Mn has the intrinsic merits including high energy density (976 mAh g −1 ), air stability, and low toxicity. However, application of in rechargeable is limited by lack proper cathodes for reversible 2+ intercalation/de‐intercalation, thus leading to working voltage (<1.8 V) poor cycling stability (≤200 cycles). Herein, a high‐voltage durable MMB with graphite as cathode successfully constructed using LiPF 6 ‐Mn(TFSI) 2 hybrid electrolyte, which shows discharge 2.34 V long‐term up 1000 cycles. Mn(TFSI) reduce plating/stripping overpotential ions, while efficiently improve conductivity electrolyte. Electrochemical in‐situ characterization implies dual‐anions intercalation/de‐intercalation at reaction anode. Theoretical calculations unveil top site energetically favorable anions intercalation TFSI − migration barrier. This work paves an avenue designing high‐performance MMBs towards electricity storage.

Language: Английский

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A Solid‐Solution with Asymmetric Ni‐O‐Cr Sites for Boosting Protonation toward Anodic Oxidation

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: 14(38)

Published: July 14, 2024

Abstract Replacing the slow protonation process of oxygen evolution reaction (OER) with fast alcohol electro‐oxidation can decrease driving potentials, thus improving overall efficiency electrochemical devices. However, formation effective catalytic sites for oxidation remains challenging in accelerating to inhibit metal leaching and improve catalyst stability. Herein, asymmetric Ni‐O‐Cr are constructed by alloying Cr into NiO matrix optimize coordination environments, showing significantly enhanced stability during electro‐oxidation. The maintain constant valence states Ni oxidation, efficiently suppressing dissolution even at high potentials. In situ characterizations combined theoretical calculations indicate that adsorption activation OH* molecules compared pure NiO, increasing anodic kinetics. results also smaller gap 3 d ‐O 2 p strengthens charge transfer, leading This work gives insights boosting using sites‐enriched solid‐solution electrocatalysts.

Language: Английский

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Accelerating electrosynthesis of ammonia from nitrates using coupled NiO/Cu nanocomposites

Chemical Communications, Journal Year: 2024, Volume and Issue: 60(16), P. 2184 - 2187

Published: Jan. 1, 2024

The synergy between Ni and Cu centers helps to avoid the accumulation of nitrite intermediates, thus boosting electroreduction nitrate ammonia.

Language: Английский

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Catalytic Mechanism of Nanocrystalline and Amorphous Matrix in Fe‐Based Microwires for Advanced Oxidation

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

Published: Feb. 24, 2025

Abstract The sustainable management of water resources is a critical global challenge, with advanced oxidation processes emerging as promising solution for addressing environmental pollution. However, the clear trade‐off between catalytic activity and stability in existing catalysts hinders their broader application. In this study, nanocrystalline/amorphous (N/A) microwire catalyst developed, featuring design that regulates nanocrystal size while preserving pure amorphous matrix. Unlike brittle annealed N/A microwires subjected to structural relaxation, as‐cast demonstrate outstanding performance oxidation. They can completely degrade pollutants within 60 s maintain up 40 reuse cycles. Theoretical calculations material characterizations reveal exceptional properties arise from combined effects residual stresses stored matrix synergistic effect nanocrystals phases. Moreover, optimally sized nanocrystalline phase optimizes atomic arrangement induces an structure low coordination number, providing abundant active sites. This also enhances adsorption characteristics persulfate accelerates electron transfer. These findings offer novel framework developing efficient stable wastewater treatment.

Language: Английский

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Lattice Strain‐Modulated Trifunctional CoMoO₄ Polymorph‐Based Electrodes for Asymmetric Supercapacitors and Self‐Powered Water Splitting

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

Published: Jan. 13, 2025

Abstract Developing efficient, multifunctional electrodes for energy storage and conversion devices is crucial. Herein, lattice strains are reported in the β‐phase polymorph of CoMoO 4 within @Co 3 O heterostructure via phosphorus doping (P‐CoMoO ) used as a high‐performance trifunctional electrode supercapacitors (SCs), hydrogen evolution reaction (HER), oxygen (OER) alkaline electrolytes. A tensile strain +2.42% on P‐CoMoO results superior electrochemical performance compared to . The optimized achieves high density 118 Wh kg −1 an asymmetric supercapacitor low overpotentials 189 mV HER 365 OER at current 500 mA cm −2 This overall water splitting voltage 1.71 V same making it effective bifunctional 1 m KOH freshwater electrolyte. Theoretical analysis shows that excellent can be attributed interfacial interactions between Co , which lead strong OH − adsorption barriers intermediates. Practical application demonstrated by using ‐based ASCs self‐generate (H 2 ||P‐CoMoO seawater electrolyzer, showcasing its potential future technologies.

Language: Английский

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Perovskite-based transparent pn junction in CuI/SrTiO3 toward enhanced photoelectric response via interfacial homogeneous perovskite LaCoO3 transition layer

Applied Physics Letters, Journal Year: 2025, Volume and Issue: 126(9)

Published: March 1, 2025

A transparent pn junction comprising CuI/LaCoO3 QDs/SrTiO3 was synthesized using the solgel-hydrothermal-freeze drying-sputtering in situ iodization method. The achieves transmittance of ∼85%, photoelectric enhancement ∼2.2 × 103-fold to intrinsic CuI/SrTiO3, and good stability 5 months. It can be primarily attributed LaCoO3 QDs. In addition appropriate Fermi level high QY, QDs with carrier inducing–injecting–driving ameliorate dynamics for PCE-transparency balance, meanwhile increasing hole by Cu vacancy. Furthermore, CuI, LaCoO3, SrTiO3 maintain structural potential devices.

Language: Английский

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Exploring the properties, types, and performance of atomic site catalysts in electrochemical hydrogen evolution reactions

Chemical Society Reviews, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

This review investigates atomic site catalysts (ASCs) for electrochemical hydrogen evolution reaction (HER), discussing their properties, types, performance, significance, activity, selectivity, stability, challenges, and future research directions.

Language: Английский

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Fe–Co-Based Metal–Organic Frameworks as Peroxidase Mimics for Sensitive Colorimetric Detection and Efficient Degradation of Aflatoxin B₁

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(9), P. 11809 - 11820

Published: Feb. 22, 2024

Building multifunctional platforms for integrating the detection and control of hazards has great significance in food safety environment protection. Herein, bimetallic Fe–Co-based metal–organic frameworks (Fe–Co-MOFs) peroxidase mimics are prepared applied to develop a bifunctional platform synergetic sensitive controllable degradation aflatoxin B1 (AFB1). On one hand, Fe–Co-MOFs with excellent peroxidase-like activity combined target-induced catalyzed hairpin assembly (CHA) construct colorimetric aptasensor AFB1. Specifically, binding aptamer AFB1 releases prelocked Trigger initiate CHA cycle between H2-modified H1-tethered magnetic nanoparticles form complexes. After separation, signal supernatant presence TMB H2O2 is inversely proportional target contents. Under optimal conditions, this biosensor enables analysis limit 6.44 pg/mL, high selectivity satisfactory recovery real samples obtained. other remarkable Fenton-like catalytic performance organic contaminants further used detoxification after detection. The almost completely removed within 120 min. Overall, introduction improves sensing sensitivity; efficient postcolorimetric-detection reduces secondary contamination risk experimental operators. This strategy expected provide ideas designing integrate various hazards.

Language: Английский

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Ru₂P/Ir₂P Heterostructure Promotes Hydrogen Spillover for Efficient Alkaline Hydrogen Evolution Reaction

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: 14(29)

Published: May 25, 2024

Abstract Efficient and durable electrocatalysts toward alkaline hydrogen evolution reaction (HER) are of great significance for the widespread application anion‐exchange membrane water electrolyzer (AEMWE). Numerous single‐phase catalysts, such as Ru 2 P, have been explored efficient HER catalysts; however, many failed to overcome inherent sluggish kinetics two separate steps involved in HER: dissociation production. In this study, density functional theory calculations conducted identify promising combinations Ir P materials that promote fast cascade H production via kinetically favorable spillover from surface adjacent P. An unprecedented construction cluster‐decorated hollow nanotubes ( c ‐RP/IP HNTs), which feature a cooperative heterostructural synergy developed. This configuration shows greater performance than commercial Pt/C, achieving an overpotential 23.2 mV at 10 mA cm − maintaining long‐term stability 55 h half‐cell tests. Furthermore, practical AEMWE test, incorporating HNTs, demonstrated remarkable single‐cell 12.23 A −2 2.0 V operated stably under 1.0 over 250 h. surpasses state‐of‐the‐art proton‐exchange WE.

Language: Английский

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