Advanced Atomically Dispersed Metal–Nitrogen–Carbon Catalysts Toward Cathodic Oxygen Reduction in PEM Fuel Cells

Advanced Energy Materials, Год журнала: 2021, Номер 11(37)

Опубликована: Авг. 26, 2021

Abstract Proton exchange membrane fuel cells (PEMFCs) are a highly efficient hydrogen energy conversion technology, which shows great potential in mitigating carbon emissions and the crisis. Currently, to accelerate kinetics of oxygen reduction reaction (ORR) required for PEMFCs, extensive utilization expensive rare platinum‐based catalysts at cathodic side, impeding their large‐scale commercialization. In response this issue, atomically dispersed metal–nitrogen–carbon (M–N–C) with cost‐effectiveness, encouraging activity, unique advantages (e.g., homogeneous activity sites, high atom efficiency, intrinsic activity) have been widely investigated. Considerable progress domain has witnessed past decade. Herein, comprehensive summary recent development M–N–C ORR under acidic conditions application electrode assembly (MEA) PEM cells, presented. The mechanisms, composition, operating principles PEMFCs introduced. Thereafter, towards improved MEA performance is summarized detail, improvement strategies stability systematically analyzed. Finally, remaining challenges significant research directions design high‐performance discussed.

Язык: Английский

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High‐Valence Oxides for High Performance Oxygen Evolution Electrocatalysis

Advanced Science, Год журнала: 2023, Номер 10(22)

Опубликована: Май 30, 2023

Valence tuning of transition metal oxides is an effective approach to design high-performance catalysts, particularly for the oxygen evolution reaction (OER) that underpins solar/electric water splitting and metal-air batteries. Recently, high-valence (HVOs) are reported show superior OER performance, in association with fundamental dynamics charge transfer intermediates. Particularly considered adsorbate mechanism (AEM) lattice oxygen-mediated (LOM). High-valence states enhance performance mainly by optimizing e

Язык: Английский

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Metal–Organic Frameworks Constructed from Iron‐Series Elements for Supercapacitors

Small Structures, Год журнала: 2021, Номер 3(5)

Опубликована: Окт. 9, 2021

Iron‐series (Fe, Co, and Ni) containing metal–organic frameworks (MOFs) have gained great concern in supercapacitors (SCs) because of their tailorable architectures, multiple redox‐active sites, intriguing properties. Given the importance porosities MOFs for charge transmission, an essential assessment designs, preparation methods, engineering technologies is strongly required to further explore optimize SCs. Through empowering conductive backbones centers, iron‐series MOF‐based electrodes made outstanding achievements recently. This review aims summarize these core reports on MOFs. Correspondingly, design strategy, reason compositing, strategy introducing heteroatoms, current divergences structural alteration mechanisms are discussed. Potential bottleneck issues coping strategies also perspectively discussed guide future optimization.

Язык: Английский

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2D Metal–Organic Frameworks as Competent Electrocatalysts for Water Splitting

Small, Год журнала: 2023, Номер 19(15)

Опубликована: Янв. 5, 2023

Hydrogen, a clean and flexible energy carrier, can be efficiently produced by electrocatalytic water splitting. To accelerate the sluggish hydrogen evolution reaction oxygen kinetics in splitting process, highly active electrocatalysts are essential for lowering barriers, thereby improving efficiency of overall Combining distinctive advantages metal-organic frameworks (MOFs) with physicochemical properties 2D materials such as large surface area, tunable structure, accessible sites, enhanced conductivity, MOFs have attracted intensive attention field electrocatalysis. Different strategies, conductivities MOFs, reducing thicknesses MOF nanosheets, integrating conductive particles or substrates, developed to promote catalytic performances pristine MOFs. This review summarizes recent advances MOF-based electrolysis. In particular, their intrinsic detailly analyzed reveal important roles inherent centers, other situ generated phases from responsible reactions. Finally, challenges development prospects future applications discussed.

Язык: Английский

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In‐MOF‐Derived Hierarchically Hollow Carbon Nanostraws for Advanced Zinc‐Iodine Batteries

Advanced Science, Год журнала: 2022, Номер 9(33)

Опубликована: Окт. 1, 2022

Hollow carbon materials are regarded as crucial support in catalysis and electrochemical energy storage on account of their unique porous structure electrical properties. Herein, an indium-based organic framework InOF-1 can be thermally carbonized under inert argon to form indium particles through the redox reaction between nanosized oxide matrix. In particular, a type hollow nanostraw (HCNS) is situ obtained by combining fusion removal within decarboxylation process. The as-synthesized HCNS, which possesses more charge active sites, short quick electron, ion transport pathways, has become excellent carrier for electrochemically species such iodine with its internal cavity interconnected tube wall. Furthermore, assembled zinc-iodine batteries (ZIBs) provide high capacity 234.1 mAh g-1 at 1 A , ensures that adsorption dissolution electrolyte reach rapid equilibrium. rate cycle performance HCNS-based ZIBs greatly improved, thereby exhibiting retention rate. It shows better exchange than typical unidirectional nanotubes, making HCNS ideal cathode material new generation high-performance batteries.

Язык: Английский

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Bimetal‐Organic Framework Nanoboxes Enable Accelerated Redox Kinetics and Polysulfide Trapping for Lithium‐Sulfur Batteries

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(31)

Опубликована: Июнь 7, 2023

Abstract Lithium‐sulfur (Li−S) batteries are considered as promising candidates for next‐generation energy storage systems in view of the high theoretical density and low cost sulfur resources. The suppression polysulfide diffusion promotion redox kinetics main challenges Li−S batteries. Herein, we design prepare a novel type ZnCo‐based bimetallic metal–organic framework nanoboxes (ZnCo‐MOF NBs) to serve functional host hollow architecture ZnCo‐MOF NBs can ensure fast charge transfer, improved utilization, effective confinement lithium polysulfides (LiPSs). atomically dispersed Co−O 4 sites firmly capture LiPSs electrocatalytically accelerate their conversion kinetics. Benefiting from multiple structural advantages, ZnCo‐MOF/S cathode shows reversible capacity, impressive rate capability, prolonged cycling performance 300 cycles.

Язык: Английский

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Exploring new frontiers in supercapacitor electrodes through MOF advancements

Journal of Energy Storage, Год журнала: 2023, Номер 76, С. 109822 - 109822

Опубликована: Ноя. 29, 2023

Supercapacitors (SCs) are considered remarkable energy storage technology because of their prolonged cycling longevity and power density (Pd). However, the constrained (Ed) SCs presents a notable barrier to widespread adoption. Therefore, it is crucial prioritize developing exploring novel electrode materials improve electrochemical performance within usage. The use metal-organic frameworks (MOFs) in has been subject thorough investigation by researchers, primarily due noteworthy attributes, including but not limited high porosity, customizable pore structure, substantial specific surface area (SSA). main objective this review provide compressive overview latest developments realm pure MOFs associated composites, encompassing both MOF composites derivatives. Particular emphasis placed on utilization context applications. Furthermore, we provided individual viewpoints concerning current challenges prospective these framework application.

Язык: Английский

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Bioadhesive and electroactive hydrogels for flexible bioelectronics and supercapacitors enabled by a redox-active core–shell PEDOT@PZIF-71 system

Materials Horizons, Год журнала: 2023, Номер 10(6), С. 2169 - 2180

Опубликована: Янв. 1, 2023

Stretchable and conductive hydrogels are rapidly emerging as new generation candidates for wearable devices. However, the poor electroactivity bioadhesiveness of traditional has limited their applications. Herein, a mussel-inspired strategy is proposed to prepare specific core-shell redox-active system, consisting polydopamine (PDA) modified zeolitic imidazolate framework 71 (ZIF-71) core, poly 3,4-ethylenedioxythiopene (PEDOT) shell. Owing abundant catechol groups, PEDOT can be assembled on surface ZIF-71 create system. The nanoparticles could act nanofiller develop polyacrylamide (PAM) hydrogel with energy-storage properties. PEDOT@PZIF-71 system provides environment in matrix endows stretchability adhesiveness. applied functional electrode both bioelectronics supercapacitors. Moreover, this exhibits favorable biocompatibility implanted vivo biosignal measurement without causing inflammation. This promising design hydrogel-based electronic

Язык: Английский

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Double-phase engineering of cobalt sulfide/oxyhydroxide on metal-organic frameworks derived iron carbide-integrated porous carbon nanofibers for asymmetric supercapacitors

Advanced Composites and Hybrid Materials, Год журнала: 2023, Номер 6(5)

Опубликована: Сен. 30, 2023

Язык: Английский

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Harnessing the potential of MOF-derived metal oxide composites to optimize energy efficiency in batteries and supercapacitors

Journal of Energy Storage, Год журнала: 2024, Номер 87, С. 111447 - 111447

Опубликована: Март 26, 2024

Язык: Английский

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