Multisite Synergism‐Induced Electron Regulation of High‐Entropy Alloy Metallene for Boosting Alkaline Hydrogen Evolution Reaction

Advanced Functional Materials, Год журнала: 2023, Номер 33(42)

Опубликована: Июнь 14, 2023

Abstract Designing the high‐entropy alloys (HEAs) electrocatalysts with controllable nanostructures is of great significance for development efficient alkaline hydrogen evolution reaction (HER) electrocatalysts. In this study, an ultrathin HEA‐PdPtRhIrCu metallene abundant lattice distortions and defects prepared via a facile one‐step hydrothermal method. The synthesized exhibits superior HER performance in 1 m KOH solution, where required overpotential only 15 mV to reach current density −10 mA cm −2 while possessing low Tafel slope 37 dec −1 . Density functional theory calculations further prove that synergistic effect five elements can optimize electronic structure enhance activity catalysts. particular, strong coupling bonding arising from interaction between multi‐metal components facilitate electron transfer surface high electroactivity. Moreover, optimized Pt promotes optimal PtH binding at site, thus promoting performance.

Язык: Английский

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Energy-saving and product-oriented hydrogen peroxide electrosynthesis enabled by electrochemistry pairing and product engineering

Nature Communications, Год журнала: 2023, Номер 14(1)

Опубликована: Окт. 7, 2023

Hydrogen peroxide (H

Язык: Английский

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Controllable Electron Distribution Reconstruction of Spinel NiCo₂O₄ Boosting Glycerol Oxidation at Elevated Current Density

Advanced Functional Materials, Год журнала: 2023, Номер 34(3)

Опубликована: Окт. 5, 2023

Abstract Electrocatalytic glycerol oxidation reaction (GOR) is an effective way to convert biomass byproduct high value‐added chemicals, which; however, suffers from the low activity and conversion ratio of presently available catalysts. Herein, NiCo 2 O 4 /NF bimetallic oxide nanoarray controllably fabricated by Ni substituting for octahedral Co 3+ in 3 , which exhibits excellent GOR catalytic at elevated current densities ( E 300 = 1.42 V, 600 1.62 V) overall Faradaic efficiency 97.5% V (FE formic acid 89.9% FE glycolic 7.62%). The performance attributed structure evolution including rapid generation III ‐OOH active species, optimized intermediates adsorption, accelerated electron transfer owing introduction, are evidenced operando spectroscopy measurements density functional theory calculations, respectively. GOR/hydrogen coupled two‐electrode electrolytic cell voltage ≈299 mV lower than that water splitting 50 mA cm −2 . More importantly, compared conventional splitting, this electrolyzer stable over 200 h 1.75 reducing energy consumption 16.9% obtaining products anode concurrently.

Язык: Английский

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Plasmonic Near‐Infrared‐Response S‐Scheme ZnO/CuInS₂ Photocatalyst for H₂O₂ Production Coupled with Glycerin Oxidation

Advanced Materials, Год журнала: 2024, Номер 36(32)

Опубликована: Июнь 4, 2024

Abstract Solar fuel synthesis is intriguing because solar energy abundant and this method compensates for its intermittency. However, most photocatalysts can only absorb UV‐to‐visible light, while near‐infrared (NIR) light remains unexploited. Surprisingly, the charge transfer between ZnO CuInS 2 quantum dots (QDs) transform a NIR‐inactive into NIR‐active composite. This strong response attributed to increased concentration of free carriers in p‐type semiconductor at interface after migration , enhancing localized surface plasmon resonance (LSPR) effect NIR . As paradigm, ZnO/CuInS heterojunction used H O production coupled with glycerin oxidation demonstrates supreme performance, corroborating importance efficient transfer. Mechanistic studies through contact potential difference (CPD), Hall test, finite element (FEM) calculation allow direct correlation approach bypasses general issues, thereby stepping forward ambitious goal harnessing entire spectrum.

Язык: Английский

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Accelerating the generation of NiOOH by in-situ surface phosphating nickel sulfide for promoting the proton-coupled electron transfer kinetics of urea electrolysis

Chemical Engineering Journal, Год журнала: 2024, Номер 483, С. 149264 - 149264

Опубликована: Фев. 3, 2024

Язык: Английский

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