Oxygen Vacancy and Core–Shell Heterojunction Engineering of Anemone‐Like CoP@CoOOH Bifunctional Electrocatalyst for Efficient Overall Water Splitting

Small, Год журнала: 2022, Номер 18(12)

Опубликована: Янв. 22, 2022

Constructing cost-efficient and robust bifunctional electrocatalysts for both neutral alkaline water splitting is highly desired, but still affords a great challenge, due to sluggish hydrogen/oxygen evolution reaction (HER/OER) kinetics. Herein, an in situ integration engineering strategy of oxygen-vacancy core-shell heterojunction fabricate anemone-like CoP@CoOOH with rich oxygen-vacancies supported on carbon paper (CoP@CoOOH/CP), described. Benefiting from the synergy CoP core oxygen-vacancy-rich CoOOH shell, as-obtained CoP@CoOOH/CP catalyst displays low overpotentials at 10 mA cm-2 HER (89.6 mV/81.7 mV) OER (318 mV/200 media, respectively. Notably, two-electrode electrolyzer, using as achieve , only needs low-cell voltages (1.65 V) (1.52 electrolyte. Besides, systematically experimental theoretical results reveal that efficiently accelerates catalytic kinetics strengthens structural stability, while decrease kinetic barrier activation energy, reduce energy rate-determining-step intermediates, thus intrinsically boosting performance. This work clearly demonstrates provide effective design highly-efficient non-precious, bi-functional pH-universal splitting.

Язык: Английский

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Platinum single-atom catalyst with self-adjustable valence state for large-current-density acidic water oxidation

eScience, Год журнала: 2021, Номер 2(1), С. 102 - 109

Опубликована: Дек. 28, 2021

The design of active acidic oxygen evolution reaction (OER) catalysts is paramount importance to achieve efficient large-current-density industrial hydrogen fuel production via water electrolysis. Herein, we develop a Pt-based catalyst with high electrochemical activity for the OER in conditions under large current. We this by modulating electronic structure Pt into high-valence, electron-accessible Pt1(2.4+δ)+ (δ ​= ​0–0.7) state during reaction. This single-site can effectively maintain current density 120 ​mA ​cm−2 more than 12 ​h 0.5 ​M ​H2SO4 at low overpotential 405 ​mV, and it shows mass ∼3350 A gmetal−1 10 232 ​mV overpotential. Using situ synchrotron radiation infrared X-ray absorption spectroscopies, directly observe an experiment that key (∗O)–Pt1–C2N2 intermediate produced potential-driven structural optimization square pyramidal Pt1–C2N2 moieties; highly favors dissociation H2O over sites prevents over-oxidation dissolution sites.

Язык: Английский

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A short review on generation of green fuel hydrogen through water splitting

International Journal of Hydrogen Energy, Год журнала: 2022, Номер 48(2), С. 523 - 541

Опубликована: Окт. 20, 2022

Язык: Английский

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

Energy & Environmental Science, Год журнала: 2023, Номер 16(3), С. 1100 - 1110

Опубликована: Янв. 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.

Язык: Английский

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Comprehensive overview of polyoxometalates for electrocatalytic hydrogen evolution reaction

Coordination Chemistry Reviews, Год журнала: 2023, Номер 482, С. 215058 - 215058

Опубликована: Фев. 22, 2023

Язык: Английский

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Valence Oscillation of Ru Active Sites for Efficient and Robust Acidic Water Oxidation

Advanced Materials, Год журнала: 2023, Номер 35(48)

Опубликована: Сен. 6, 2023

The continuous oxidation and leachability of active sites in Ru-based catalysts hinder practical application proton-exchange membrane water electrolyzers (PEMWE). Herein, robust inter-doped tungsten-ruthenium oxide heterostructures [(Ru-W)Ox ] fabricated by sequential rapid metal thermomigration processes are proposed to enhance the activity stability acidic oxygen evolution reaction (OER). introduction high-valent W species induces valence oscillation Ru during OER, facilitating cyclic transition states maintaining operation sites. preferential electronic gain heterostructure significantly stabilize RuOx on WOx substrates beyond Pourbaix limit bare RuO2 . Furthermore, asymmetric Ru-O-W units generated around interface adsorb intermediates synergistically, enhancing intrinsic OER activity. Consequently, (Ru-W)Ox not only demonstrate an overpotential 170 mV at 10 mA cm-2 excellent 300 h electrolytes but also exhibit potential for applications, as evidenced stable 0.5 A PEMWE.

Язык: Английский

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Hybridized bimetallic phosphides of Ni–Mo, Co–Mo, and Co–Ni in a single ultrathin-3D-nanosheets for efficient HER and OER in alkaline media

Composites Part B Engineering, Год журнала: 2022, Номер 239, С. 109992 - 109992

Опубликована: Май 20, 2022

Язык: Английский

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Alleviating the Work Function of Vein‐Like Co_XP by Cr Doping for Enhanced Seawater Electrolysis

Advanced Functional Materials, Год журнала: 2023, Номер 33(30)

Опубликована: Апрель 20, 2023

Abstract For mass production of hydrogen fuel by electrochemical water splitting, seawater is preferred because its abundant reserves on Earth. However, the current electrolysis technology seriously hindered low selectivity and poor stability oxygen evolution reaction (OER) at anode due to undesirable chloride electrochemistry severe corrosion in practical application. Herein, based “work function optimization” concept, vein‐like Cr‐doping Co x P rationally designed as a highly‐efficient OER electrocatalyst for direct electrolysis, achieving densities 20 100 mA cm –2 overpotentials 268 325 mV, respectively, together with high long‐term stability. Experimental data theoretical calculations reveal that regulation electronic structure induced Cr doping strongly alleviates work P, which not only accelerates electron transfer between catalyst surface absorbates but also lowers energy barriers dissociation rate‐determining step both (HER). Moreover, protects sites robust valence states maintain their performance during process, providing new avenue design non‐noble metal‐based catalysts generation from electrolysis.

Язык: Английский

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Self‐integration exactly constructing oxygen‐modified MoNi alloys for efficient hydrogen evolution

EcoEnergy, Год журнала: 2023, Номер 1(2), С. 425 - 436

Опубликована: Дек. 1, 2023

Abstract Introducing oxygen atoms into nickel‐based alloys is an effective strategy for constructing water dissociation sites hydrogen evolution reaction (HER). However, controlling content to realize the best match of and adsorption challenging. Herein, we exploit self‐integration process MoNi alloy in molten salts introduce atoms, which ultimately leads localized generation robust NiO x H y around alloys. Interestingly, Mo further doped (Mo‐NiO ) construct active center due high mobility ionic solutions. Owing covering space confinement salt, exactly decorated with Mo‐NiO nanosheets. Both physical characterization density functional theory calculation prove that electron transport, capability, are finely tuned benefited from O doping, thus greatly expediting HER kinetics. exhibits a much lower overpotential 33 mV at 10 cm −2 alkaline electrolyte, even superior Pt/C benchmark. Moreover, final requires low 57 acidic media. This enhancement ascribed successful assembly foam elicited by salt.

Язык: Английский

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Modulating Local Interfacial Bonding Environment of Heterostructures for Energy‐Saving Hydrogen Production at High Current Densities

Advanced Functional Materials, Год журнала: 2023, Номер 33(12)

Опубликована: Янв. 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.

Язык: Английский

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