Heterogeneous‐Interface‐Enhanced Adsorption of Organic and Hydroxyl for Biomass Electrooxidation

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(42)

Published: Aug. 29, 2022

Electrocatalytic oxidation of 5-hydroxymethylfurfural (HMF) provides an efficient way to obtain high-value-added biomass-derived chemicals. Compared with other transition metal oxides, CuO exhibits poor oxygen evolution reaction performance, leading high Faraday efficiency for HMF oxidation. However, the weak adsorption and activation ability OH- species restricts its further development. Herein, CuO-PdO heterogeneous interface is successfully constructed, resulting in advanced onset-potential (HMFOR), a higher current density than CuO. The results open-circuit potential, situ infrared spectroscopy, theoretical calculations indicate that introduction PdO enhances capacity organic molecule. Meanwhile, promotes species, as demonstrated by zeta potential electrochemical measurements. This work elucidates enhancement mechanism interfaces constructive guidance designing multicomponent electrocatalysts electrocatalytic reactions.

Language: Английский

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Rapid complete reconfiguration induced actual active species for industrial hydrogen evolution reaction

Nature Communications, Journal Year: 2022, Volume and Issue: 13(1)

Published: Oct. 2, 2022

Rational regulation of electrochemical reconfiguration and exploration activity origin are important foundations for realizing the optimization electrocatalyst activity, but rather challenging. Herein, we potentially develop a rapid complete strategy heterostructures CoC2O4 coated by MXene nanosheets (CoC2O4@MXene) during hydrogen evolution reaction (HER) process. The self-assembled CoC2O4@MXene nanotubular structure has high electronic accessibility abundant electrolyte diffusion channels, which favor reconfiguration. Such creates new actual catalytic active species Co(OH)2 transformed from CoC2O4, is coupled with to facilitate charge transfer decrease free energy Volmer step toward fast HER kinetics. reconfigured components require low overpotentials 28 216 mV at 10 1000 mA cm-2 in alkaline conditions decent stability natural seawater. This work gives insights understanding formation opens up way high-performance electrocatalysts.

Language: Английский

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Methanol upgrading coupled with hydrogen product at large current density promoted by strong interfacial interactions

Energy & Environmental Science, Journal Year: 2023, Volume and Issue: 16(3), P. 1100 - 1110

Published: Jan. 1, 2023

The ultrafast solution combustion synthesis of heterogeneous interface is developed to boost anodic organic upgrading reaction, which exhibits remarkable current density and faradaic efficiency benefiting from the strong electronic interaction.

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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Electronic Modulation of Metal–Organic Frameworks by Interfacial Bridging for Efficient pH‐Universal Hydrogen Evolution

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 33(1)

Published: Oct. 26, 2022

Abstract Designing well‐defined interfacial chemical bond bridges is an effective strategy to optimize the catalytic activity of metal–organic frameworks (MOFs), but it remains challenging. Herein, a facile in situ growth reported for synthesis tightly connected 2D/2D heterostructures by coupling MXene with CoBDC nanosheets. The multifunctional nanosheets high conductivity and ideal hydrophilicity as bridging carriers can ensure structural stability sufficient exposure active sites. Moreover, Co–O–Ti formed at interface effectively triggers charge transfer modulates electronic structure Co‐active site, which enhances reaction kinetics. As result, optimized CoBDC/MXene exhibits superior hydrogen evolution (HER) low overpotentials 29, 41, 76 mV 10 mA cm −2 alkaline, acidic, neutral electrolytes, respectively, comparable commercial Pt/C. Theoretical calculation demonstrates that bridging‐induced electron redistribution optimizes free energy water dissociation adsorption, resulting improved evolution. This study not only provides novel electrocatalyst efficient HER all pH conditions also opens up new avenue designing highly systems.

Language: Английский

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Ultrafast Combustion Synthesis of Robust and Efficient Electrocatalysts for High-Current-Density Water Oxidation

ACS Nano, Journal Year: 2023, Volume and Issue: 17(2), P. 1701 - 1712

Published: Jan. 9, 2023

The scalable production of inexpensive, efficient, and robust catalysts for oxygen evolution reaction (OER) that can deliver high current densities at low potentials is critical the industrial implementation water splitting technology. Herein, a series metal oxides coupled with Fe

Language: Английский

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Tuning Co‐Catalytic Sites in Hierarchical Porous N‐Doped Carbon for High‐Performance Rechargeable and Flexible Zn‐Air Battery

Advanced Energy Materials, Journal Year: 2022, Volume and Issue: 13(1)

Published: Nov. 6, 2022

Abstract The strategy of heteroatom doping and metal active sites can synergistically promote oxygen electrocatalysis. Especially, the combination theoretical simulations with experimental results provides new opportunities to understand electrocatalytic mechanism. Herein, 3D carbon nanosheets aggregate highly branched nanotubes cobalt (CoCNTs/PNAs) is prepared via facile self‐assembly‐pyrolysis strategy. CoCNTs/PNAs electrocatalysts exhibit superior bifunctional activities reduction ( E 1/2 = 0.925 V) evolution j 10 1.54 reactions, surpassing those Pt/C‐RuO 2 catalysts. calculations reveal that electronic interaction nitrogen‐doped matrix plays a critical role in boosting performance. Additionally, rechargeable Zn‐Air battery (ZAB) assembled aqueous electrolyte exhibits largest power density 371.6 mW cm −2 outstanding cycling durability (over 2000 h). Furthermore, all‐solid‐state cable‐type ZAB delivers high flexibility good stability energy efficiency (76.5%). This work will open avenue adjust metal‐carbon support for functional electrocatalysis hierarchical porous structure design.

Language: Английский

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Manipulating electron redistribution induced by asymmetric coordination for electrocatalytic water oxidation at a high current density

Science Bulletin, Journal Year: 2023, Volume and Issue: 68(13), P. 1389 - 1398

Published: June 3, 2023

Language: Английский

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Interfacial engineering of heterostructured carbon-supported molybdenum cobalt sulfides for efficient overall water splitting

Tungsten, Journal Year: 2023, Volume and Issue: 5(4), P. 589 - 597

Published: March 20, 2023

Language: Английский

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Recent developments of MXene-based catalysts for hydrogen production by water splitting

Green Chemistry, Journal Year: 2023, Volume and Issue: 25(5), P. 1749 - 1789

Published: Jan. 1, 2023

In the application of electrolytic water splitting, MXenes can achieve performance optimization by doping, surface functional group regulation, construction defect/vacancy, 3D/porous structure, or compounding with other materials.

Language: Английский

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