Hybrid 2D Dual‐Metal–Organic Frameworks for Enhanced Water Oxidation Catalysis

Advanced Functional Materials, Год журнала: 2018, Номер 28(26)

Опубликована: Апрель 30, 2018

Abstract Metal–organic frameworks (MOFs) and MOF‐derived nanostructures are recently emerging as promising catalysts for electrocatalysis applications. Herein, 2D MOFs nanosheets decorated with Fe‐MOF nanoparticles synthesized evaluated the water oxidation catalysis in alkaline medium. A dramatic enhancement of catalytic activity is demonstrated by introduction electrochemically inert onto active nanosheets. In case Ni‐MOF (Ni‐MOF@Fe‐MOF), overpotential 265 mV to reach a current density 10 mA cm −2 1 m KOH, which lowered ≈100 after hybridization due nanosheet morphology synergistic effect between Ni centers Fe species. Similar performance improvement also successfully NiCo‐MOF More importantly, real species hybrid Ni‐MOF@Fe‐MOF catalyst unraveled. It found that, NiO nanograins (≈5 nm) formed situ during oxygen evolution reaction (OER) process act OER well building blocks porous catalysts. These findings provide new insights into understanding MOF‐based catalysis, shed light on designing highly efficient electrocatalysis.

Язык: Английский

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Enhancing Electrocatalytic Water Splitting by Strain Engineering

Advanced Materials, Год журнала: 2019, Номер 31(17)

Опубликована: Фев. 18, 2019

Electrochemical water splitting driven by sustainable energy such as solar, wind, and tide is attracting ever-increasing attention for production of clean hydrogen fuel from water. Leveraging these advances requires efficient earth-abundant electrocatalysts to accelerate the kinetically sluggish oxygen evolution reactions (HER OER). A large number advanced water-splitting have been developed through recent understanding electrochemical nature engineering approaches. Specifically, strain offers a novel route promote electrocatalytic HER/OER performances splitting. Herein, theoretical experimental progress on applying enhance heterogeneous both HER OER are reviewed future opportunities discussed. brief introduction fundamentals reactions, rationalization utilizing mechanical tune an electrocatalyst given, followed discussion strain-promoted OER, with special emphasis given combined approaches determining optimal straining effect electrolysis, along creating characterizing in nanocatalysts, particularly emerging 2D nanomaterials. Finally, vision community based electrolysis proposed.

Язык: Английский

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Overall electrochemical splitting of water at the heterogeneous interface of nickel and iron oxide

Nature Communications, Год журнала: 2019, Номер 10(1)

Опубликована: Дек. 6, 2019

Abstract Efficient generation of hydrogen from water-splitting is an underpinning chemistry to realize the economy. Low cost, transition metals such as nickel and iron-based oxides/hydroxides have been regarded promising catalysts for oxygen evolution reaction in alkaline media with overpotentials low ~200 mV achieve 10 mA cm −2 , however, they are generally unsuitable reaction. Herein, we show a Janus nanoparticle catalyst nickel–iron oxide interface multi-site functionality highly efficient comparable performance benchmark platinum on carbon catalyst. Density functional theory calculations reveal that catalytic activity induced by strong electronic coupling effect between iron at interface. Remarkably, also exhibits extraordinary activity, enabling active stable bi-functional whole cell with, best our knowledge, highest energy efficiency (83.7%) reported date.

Язык: Английский

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Design Strategies toward Advanced MOF‐Derived Electrocatalysts for Energy‐Conversion Reactions

Advanced Energy Materials, Год журнала: 2017, Номер 7(23)

Опубликована: Июнь 9, 2017

Abstract The key challenge to developing renewable and clean energy technologies lies in the rational design synthesis of efficient earth‐abundant catalysts for a wide variety electrochemical reactions. This review presents materials strategies constructing improved electrocatalysts based on MOF precursors/templates, with special emphasis component manipulation, morphology control, structure engineering. Guided by these strategies, recently developed MOF‐derived have exhibited remarkable activity, selectivity, stability various energy‐conversion processes, manifesting great potential replacing precious‐metal‐based next‐generation devices. Existing challenges opportunities regarding are also discussed. It is anticipated that extending current wider range precursors energy‐related electrocatalytic reactions, significant advances toward achieving highly can be made.

Язык: Английский

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Strategies for enhancing the photocurrent, photovoltage, and stability of photoelectrodes for photoelectrochemical water splitting

Chemical Society Reviews, Год журнала: 2019, Номер 48(19), С. 4979 - 5015

Опубликована: Янв. 1, 2019

To accelerate the deployment of hydrogen produced by renewable solar energy, several technologies have been competitively developed, including photoelectrochemical (PEC), photocatalytic, and photovoltaic-electrolysis routes. In this review, we place PEC in context with these competing highlight key advantages systems. After defining unique performance metrics water splitting system, recently developed strategies for enhancing each metric, such as photocurrent density, photovoltage, fill factor, stability are surveyed conjunction relevant theoretical aspects. addition, various advanced characterization methods discussed, situ techniques, allowing us to understand not only basic properties materials but also diverse photophysical phenomena underlying system. Based on insights gained from provide a resource researchers field well those who want join field, offer an outlook how thin film-based studies could lead commercially viable

Язык: Английский

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