Construction of iron oxyhydroxide/nickel sulfate hydroxide hybrid electrocatalyst for efficient oxygen evolution

Rare Metals, Journal Year: 2024, Volume and Issue: unknown

Published: July 12, 2024

Language: Английский

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Surface Anticorrosion Engineering by Polyphosphate Oxyanions for Durable Seawater Oxidation

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

Published: Aug. 29, 2024

Abstract Electrolysis of seawater represents great potentials for sustainable hydrogen production. However, both competitive Cl − adsorption and catalysts corrosion caused by chlorine oxidation reaction (ClOR) are major challenges in electrolysis. Inspired the concept hard soft acids bases (HSAB), polyphosphate oxyanions (P 3 O 10 5− ) on Ni(OH) 2 surface is coordinated to obtain harder acid Ni sites, which could 160 times stability enhancement compared pure oxygen evolution (OER) alkaline at 800 mA cm −2 . Also, turnover frequency value ‐P 50 that , implying higher intrinsic OER activity Theoretical experimental investigations show P facilitate transition 3+ >3+ thus preferring base OH rather than This enhance selectivity inhibit undesirable ClOR. Furthermore, molecular dynamics simulations indicate concentration near electrode be reduced nearly half due electrostatic repulsion oxyanions. When assembled into an electrolyzer splitting, it operate 2.2 V with large current up 1.4 A 240 h.

Language: Английский

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In Situ Electrochemical Rapid Induction of Highly Active γ‐NiOOH Species for Industrial Anion Exchange Membrane Water Electrolyzer

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

Published: April 12, 2024

Limited by the strong oxidation environment and sluggish reconstruction process in oxygen evolution reaction (OER), designing rapid self-reconstruction with high activity stability electrocatalysts is crucial to promoting anion exchange membrane (AEM) water electrolyzer. Herein, trace Fe/S-modified Ni oxyhydroxide (Fe/S-NiOOH/NF) nanowires are constructed via a simple situ electrochemical strategy based on precipitation-dissolution equilibrium. In characterization techniques reveal that successful introduction of Fe S leads lattice disorder boosts favorable hydroxyl capture, accelerating formation highly active γ-NiOOH. The Density Functional Theory (DFT) calculations have also verified incorporation optimizes electrons redistribution d-band center, decreasing energy barrier rate-determining step (

Language: Английский

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Inducing Intermolecular Oxygen Coupling by Introducing S and FeOOH on Co(OH)₂ Nanoneedle Arrays for Industrial Water Oxidation

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

Published: July 28, 2024

Abstract The design of electrocatalysts for oxygen evolution reaction (OER) remains a limitation industrial hydrogen production by electrolysis water. Excellent and stable OER catalysts can be developed activating lattice changing the path. Herein, S FeOOH on Co(OH) 2 nanoneedle arrays are introduced to construct heterostructure (S‐FeOOH/Co(OH) /NF) as proof concept. Theoretical calculations experimental suggest that Co‐O‐Fe motif formed at heterogeneous interface with introduction FeOOH, inducing electron transfer from Co Fe, enhancing Co─O covalency reducing intramolecular charge energy, thereby stimulating direct coupling. Doping in further accelerates transfer, improves activity, prevents dissolution FeOOH. Consequently, overpotential S‐FeOOH/Co(OH) /NF is only 199 mV 10 mA cm −2 , coupled Pt/C electrode up 1 A under 1.79 V remain over 120 h an anion exchange membrane water electrolyzer (AEMWE). This work proposes strategy efficient promotes commercialization AEMWE.

Language: Английский

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Trace F-doped Co3O4 nanoneedles for enhanced acidic water oxidation activity via promoting OH coverage

Green Chemistry, Journal Year: 2024, Volume and Issue: 26(18), P. 9782 - 9790

Published: Jan. 1, 2024

F doping promotes the enrichment of OH on surface Co 3 O 4 , reduces energy barrier rate-limiting step, and thus accelerates reaction efficiency.

Language: Английский

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