Exceptional catalytic activity of oxygen evolution reaction via two-dimensional graphene multilayer confined metal-organic frameworks

Nature Communications, Journal Year: 2022, Volume and Issue: 13(1)

Published: Oct. 18, 2022

Oxygen evolution reaction (OER) plays a key role in many renewable energy technologies such as water splitting and metal-air batteries. Metal-organic frameworks (MOFs) are appealing to design efficient OER electrocatalysts, however, their intrinsic poor conductivity strongly hinders the activity. Here, we show strategy boost activity of poor-conductive MOFs by confining them between graphene multilayers. The resultant NiFe-MOF//G gives record-low overpotential 106 mV reach 10 mA cm-2 retains over 150 h, which is significant contrast 399 pristine NiFe-MOF. We use X-ray absorption spectroscopy (XAS) computations demonstrate that nanoconfinement from multilayers not only forms highly reactive NiO6-FeO5 distorted octahedral species MOF structure but also lowers limiting potential for oxidation reaction. applicable other different structures largely enhance electrocatalytic activities.

Language: Английский

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Lattice‐Strain Engineering for Heterogenous Electrocatalytic Oxygen Evolution Reaction

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(39)

Published: Jan. 14, 2023

Abstract The energy efficiency of metal–air batteries and water‐splitting techniques is severely constrained by multiple electronic transfers in the heterogenous oxygen evolution reaction (OER), high overpotential induced sluggish kinetics has become an uppermost scientific challenge. Numerous attempts are devoted to enabling activity, selectivity, stability via tailoring surface physicochemical properties nanocatalysts. Lattice‐strain engineering as a cutting‐edge method for tuning geometric configuration metal sites plays pivotal role regulating interaction catalytic surfaces with adsorbate molecules. By defining d‐band center descriptor structure–activity relationship, individual contribution strain effects within state‐of‐the‐art electrocatalysts can be systematically elucidated OER optimization mechanism. In this review, fundamentals advancements strain‐catalysts showcased innovative trigger strategies enumerated, particular emphasis on feedback mechanism between precise regulation lattice‐strain optimal activity. Subsequently, modulation various attributes categorized impediments encountered practicalization strained effect discussed, ending outlook future research directions burgeoning field.

Language: Английский

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Emerging Trends of Carbon‐Based Quantum Dots: Nanoarchitectonics and Applications

Small, Journal Year: 2023, Volume and Issue: 19(17)

Published: Jan. 24, 2023

Carbon-based quantum dots (QDs) have emerged as a fascinating class of advanced materials with unique combination optoelectronic, biocompatible, and catalytic characteristics, apt for plethora applications ranging from electronic to photoelectrochemical devices. Recent research works established carbon-based QDs those frontline through improvements in design, processing, device stability. This review broadly presents the recent progress synthesis QDs, including carbon graphene graphitic nitride their heterostructures, well salient applications. The methods are first introduced, followed by an extensive discussion dependence performance on intrinsic properties nanostructures aiming present general strategies designing optimal performance. Furthermore, diverse presented, emphasis relationship between band alignment, charge transfer, improvement. Among discussed this review, much focus is given photo electrocatalytic, energy storage conversion, bioapplications, which pose grand challenge rational designs. Finally, summary existing challenges future directions elaborated.

Language: Английский

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An anionic regulation mechanism for the structural reconstruction of sulfide electrocatalysts under oxygen evolution conditions

Energy & Environmental Science, Journal Year: 2022, Volume and Issue: 15(8), P. 3257 - 3264

Published: Jan. 1, 2022

Hetero-anionic oxysulfides, possessing an optimized electronic structure and excellent intrinsic activity, are identified as the actual stable active site of sulfide pre-electrocatalysts for oxygen evolution.

Language: Английский

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CoMo carbide/nitride from bimetallic MOF precursors for enhanced OER performance

International Journal of Hydrogen Energy, Journal Year: 2021, Volume and Issue: 46(43), P. 22268 - 22276

Published: May 8, 2021

Language: Английский

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