Photocatalytic upgrading of 5-hydroxymethylfurfural – aerobic or anaerobic?

Green Chemistry, Journal Year: 2024, Volume and Issue: 26(6), P. 2949 - 2966

Published: Jan. 1, 2024

Aerobic photocatalysis generates ROS to oxidise HMF into DFF and FDCA with co-production of H 2 O that potentially induce over-oxidation. Anaerobic enables ambient oxidation simultaneous HER, or hydrogenation BHMF.

Language: Английский

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Ir-O-Mn embedded in porous nanosheets enhances charge transfer in low-iridium PEM electrolyzers

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: Jan. 2, 2025

Using metal oxides to disperse iridium (Ir) in the anode layer proves effective for lowering Ir loading proton exchange membrane water electrolyzers (PEMWE). However, reported low-Ir-based catalysts still suffer from unsatisfying electrolytic efficiency and durability under practical industrial working conditions, mainly due insufficient catalytic activity mass transport catalyst layer. Herein we report a class of porous heterogeneous nanosheet with abundant Ir-O-Mn bonds, achieving notable 4 A mgIr−1 oxygen evolution reaction at an overpotential 300 mV, which is 150.6 times higher than that commercial IrO2. bonds are unraveled serve as efficient charge-transfer channels between in-situ electrochemically-formed IrOx clusters MnOx matrix, fostering generation stabilization highly active Ir3+ species. Notably, Ir/MnOx-based PEMWE demonstrates comparable performance 10-fold lower (0.2 mgIr cm−2), taking low cell voltage 1.63 V deliver 1 cm−2 over h, positions it among elite Ir-based PEMWEs. Building proton-exchange electrolyzer remains important but challenging. Here, authors Ir/MnOx rich generate stabilize species, enhancing both stability.

Language: Английский

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Surface Reconstruction Facilitated by Fluorine Migration and Bimetallic Center in NiCo Bimetallic Fluoride Toward Oxygen Evolution Reaction

Advanced Science, Journal Year: 2023, Volume and Issue: 11(6)

Published: Dec. 3, 2023

Abstract Oxygen evolution reaction (OER) is a critical anodic of electrochemical water splitting, developing high‐efficiency electrocatalyst essential. Transition metal‐based catalysts are much more cost‐effective if comparable activities can be achieved. Among them, fluorides rarely reported due to their low aqueous stability coordination and electric conductivity. Herein, NiCo bimetallic fluoride with good crystallinity designed constructed, significantly enhanced catalytic activity conductivity observed. The inevitable oxidation transition metal ions at high potential the dissociation F − attributed coordination. theoretical researches predicte that should have strong tendency reconstruction. Therefore, based on observations behavior, high‐resolution transmission electron microscopy, X‐ray photoelectron spectroscopy, bode plots, it further demonstrated surface reconstruction occurred during process, meanwhile significant increase electrochemically active area, which created by migration, also directly Additionally, DFT calculation results show electronic structure modulated centers, this helps optimizing adsorption energy oxygen‐containing species improves OER activity.

Language: Английский

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Structure-activity relationship study of high entropy oxides catalysts for oxygen evolution reaction

Chemical Engineering Journal, Journal Year: 2023, Volume and Issue: 481, P. 148428 - 148428

Published: Dec. 29, 2023

Language: Английский

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Directed Mass and Electron Transfer Promoted by Hierarchical Porous Co–P–O Leads to Enhancement of the Overall Water Splitting Efficiency

ACS Catalysis, Journal Year: 2023, Volume and Issue: 13(22), P. 14802 - 14812

Published: Nov. 2, 2023

Optimization of the efficiencies both macroscale mass transport and microscale electron transfer is highly desired for achieving high-performance electrocatalysts but still remains a great challenge. Herein, facile topological conversion method developed to synthesize novel O-incorporated CoP derivative (denoted as Co–P–O) with directed effects, which benefits from its hierarchical porous structure internal atomic n-p homojunction, respectively. As result, Co–P–O achieves optimal hydrogen evolution reaction (HER) oxygen (OER) performance low overpotentials (113 256 mV at 10 mA cm–2, respectively) enhanced durability in water splitting. Density functional theory calculations further reveal that degree polarization/rearrangement overall surface charge delocalization effects d electrons are enhanced, leading adsorption H2O/OH– desorption generated gases enhancing HER OER activities.

Language: Английский

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Constructing unsaturated coordination Co−M (M = P, S, Se, Te) bonds modified metallic Co for efficient alkaline hydrogen evolution

Applied Catalysis B Environment and Energy, Journal Year: 2024, Volume and Issue: 350, P. 123912 - 123912

Published: April 24, 2024

Language: Английский

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Pumping Electrons from Oxygen-Bridged Cobalt for Low-Charging-Voltage Zn-Air Batteries

Nano Letters, Journal Year: 2024, Volume and Issue: 24(43), P. 13653 - 13661

Published: Oct. 21, 2024

Reducing the charging voltage is a prerequisite for improving chargeability and energy efficiency of Zn-air batteries (ZABs). Herein, Fe

Language: Английский

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A universal method to fabricate high-valence transition metal-based HER electrocatalysts and direct Raman spectroscopic evidence for interfacial water regulation

Journal of Colloid and Interface Science, Journal Year: 2024, Volume and Issue: 660, P. 157 - 165

Published: Jan. 14, 2024

Language: Английский

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Nickel Hydroxide‐Based Electrocatalysts for Promising Electrochemical Oxidation Reactions: Beyond Water Oxidation

Small, Journal Year: 2024, Volume and Issue: 20(33)

Published: March 20, 2024

Transition metal hydroxides have attracted significant research interest for their energy storage and conversion technique applications. In particular, nickel hydroxide (Ni(OH)

Language: Английский

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Boosting Oxygen Evolution Reaction Performance on NiFe-Based Catalysts Through d-Orbital Hybridization

Nano-Micro Letters, Journal Year: 2024, Volume and Issue: 17(1)

Published: Sept. 26, 2024

Abstract Anion-exchange membrane water electrolyzers (AEMWEs) for green hydrogen production have received intensive attention due to their feasibility of using earth-abundant NiFe-based catalysts. By introducing a third metal into catalysts construct asymmetrical M-NiFe units, the d -orbital and electronic structures can be adjusted, which is an important strategy achieve sufficient oxygen evolution reaction (OER) performance in AEMWEs. Herein, ternary NiFeM (M: La, Mo) featured with distinct units varying -orbitals are reported this work. Experimental theoretical calculation results reveal that doping La leads optimized hybridization between orbital 2 p oxygen, resulting enhanced adsorption strength intermediates, reduced rate-determining step energy barrier, responsible OER performance. More critically, obtained NiFeLa catalyst only requires 1.58 V reach 1 A cm −2 anion exchange electrolyzer demonstrates excellent long-term stability up 600 h.

Language: Английский

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