Synergistic engineering of heterostructure and oxygen vacancy in cobalt hydroxide/aluminum oxyhydroxide as bifunctional electrocatalysts for urea-assisted hydrogen production

Journal of Colloid and Interface Science, Journal Year: 2024, Volume and Issue: 677, P. 1069 - 1079

Published: Aug. 8, 2024

Language: Английский

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Plasma‐Constructed Co₂P–Ni₂P Heterointerface for Electro‑Upcycling of Polyethylene Terephthalate Plastic to Co‐Produce Hydrogen and Formate

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

Published: Sept. 9, 2024

Abstract Integrating electrochemical upcycling of polyethylene‐terephthalate (PET) and the hydrogen evolution reaction (HER) is an energy‐saving approach for electrolytic (H 2 ) production, along with coproduction formate. Herein, a novel rapid strategy cold plasma phosphating employed to synthesize Co P–Ni P heterointerface decorated on carbon cloth (Co P‐Ni P/CC) catalyze H generation reform PET. Notably, obtained P/CC exhibits eminent ethylene glycol oxidation (EGOR) HER activities, effectuating low potentials merely 1.300 −0.112 V versus RHE at 100 mA cm −2 EGOR HER, respectively, also attaining ultralow cell bias 10 EG assisted‐water splitting. DFT characterization results validate that as‐formed built‐in electric fields in can accelerate electrons transfer deepen structural self‐reconstruction, thereby boosting effectively water dissociation (EG) dehydrogenation. Impressively, coupling PET‐derived EG‐to‐formate flow‐cell electrolyzer assembled pair achieves intriguing formate Faradaic efficiency 90.6% extraordinary stable operation over 70 h . The work exemplifies facile effective synthesizing metal phosphides electrocatalysts performance toward splitting recycling

Language: Английский

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Heterostructure Engineering of Biphase‐Coupled Ternary Transition Metal Phosphoselenide by Topological Transformation Enabling High Performance for Supercapacitors

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

Published: Oct. 29, 2024

Abstract The exploration of promising electrode materials with structural stability and rapid interfacial reaction kinetics is highly desirable for supercapacitors toward large‐scale applications. Herein, the synthesis biphase‐coupled CoPSe/NiP 0.24 Se 1.76 multiple in‐plane heterointerfaces using in situ topological transformation approach presented. As a novel ternary metal phosphoselenide (TMPSe) supercapacitor cathode that fabricated by synchronous phosphoselenization strategy, it realizes superior lifespan cycling compared to conventional transition selenides. depleted anti‐bonding e g * orbitals ions (Co/Ni) , as proved preliminary theoretical calculations, strengthens chemical bonding between Co/Ni coordinating atoms, thereby enhancing stability. Simultaneously, multi‐heterostructures can not only alleviate volume change during charge–discharge process but also expose more active sites, promoting adsorption OH − ions, which conducive redox consequently, delivers remarkable reversible capacity excellent long‐term cycle 97.7% initial capacitance retention over 16 000 cycles. Moreover, asymmetric this demonstrate outstanding rate capability high energy density. This strategy constructing great potential application high‐performance material.

Language: Английский

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Efficient Electrocatalytic Oxidation of Glycerol to Formate Coupled with Nitrate Reduction over Cu‐doped NiCo Alloy Supported on Nickel Foam

Angewandte Chemie, Journal Year: 2024, Volume and Issue: 136(46)

Published: Aug. 12, 2024

Abstract Electrooxidation of biomass‐derived glycerol which is regarded as a main byproduct industrial biodiesel production, an innovative strategy to produce value‐added chemicals, but currently showcases slow kinetics, limited Faraday efficiency, and unclear catalytic mechanism. Herein, we report high‐efficiency electrooxidation into formate via Cu doped NiCo alloy catalyst supported on nickel foam (Cu−NiCo/NF) in coupled system paired with nitrate reduction. The designed Cu−NiCo/NF delivers only 1.23 V vs . RHE at 10 mA cm −2 , record efficiency 93.8 %. superior performance ascribed the rapid generation Ni III −OOH Co species favorable coupling surface *O reactive intermediates. Using bifunctional catalyst, synchronously produces NH 3 formate, showing 290 mV lower than hydrogen evolution reaction, together excellent long‐term stability for up 144 h. This work lays out new guidelines reliable strategies from design electrochemical refinery.

Language: Английский

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Dense Crystalline‐Amorphous Nano‐Interfaces Derived from Local Reconstruction for Alkaline Hydrogen Evolution

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

Published: Dec. 13, 2024

Abstract The crystalline‐amorphous ( c‐a ) interface can provide abundant accessible active sites and high intrinsic activity for hydrogen evolution reaction (HER); however, conventional methods only produce sparse between hetero‐phases. Here, a novel soluble dopant‐induced local self‐reconstruction strategy to yield dense nano‐interfaces is presented, as demonstrated by Mo doped‐NiP pre‐catalyst. During the cathodic polarization in alkaline electrolyte, dopant initially dissolves, generating nano‐voids within NiP nanosheets; subsequently forms situ ultrafine amorphous MoO 3 nanoparticles, ranging from 2 4 nm size, embedded crystalline nanosheets. Compared with surface reconstruction that generates interface, proposed “dopant‐dissolution‐redeposition”, occurred inner regions around dopants, nano‐interface. Theoretical calculations reveal efficiently modulate electronic structure of interfacial lower HER overpotential. Benefiting nano‐interface, amorphous/crystalline /Mo‐NiP exhibits outstanding performance, achieving current density 10 mA cm −2 at ultra‐low overpotentials 26 mV long‐term stability 1 M KOH. This work provides basis tuning composition‐structure‐property relationships materials both interior.

Language: Английский

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