Graphene oxide for photonics, electronics and optoelectronics

Nature Reviews Chemistry, Год журнала: 2023, Номер 7(3), С. 162 - 183

Опубликована: Янв. 17, 2023

Язык: Английский

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Engineering Crystallinity and Oxygen Vacancies of Co(II) Oxide Nanosheets for High Performance and Robust Rechargeable Zn–Air Batteries

Advanced Functional Materials, Год журнала: 2021, Номер 31(20)

Опубликована: Март 10, 2021

Abstract Efficient oxygen reduction reaction (ORR) and evolution (OER) processes highly rely on the rational design synthesis of high‐performance electrocatalysts. Herein, comprehensive characterizations density functional theory (DFT) calculations are combined to verify important roles crystallinity vacancy levels Co(II) oxide (CoO) ORR OER activities. A facile controllable vacuum‐calcination strategy is utilized convert Co(OH) 2 into oxygen‐defective amorphous‐crystalline CoO (namely ODAC‐CoO) nanosheets. With carefully controlled levels, optimal ODAC‐CoO sample exhibits dramatically enhanced electrocatalytic activities compared with pure crystalline counterpart. The assembled liquid quasi‐solid‐state Zn–air batteries as cathode material achieve remarkable specific capacity, power density, excellent cycling stability, outperforming benchmark Pt/C + IrO catalysts. This study theoretically proposes experimentally demonstrates that simultaneous introduction amorphous structures vacancies could be an effective avenue towards OER.

Язык: Английский

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Cation‐Vacancy‐Enriched Nickel Phosphide for Efficient Electrosynthesis of Hydrogen Peroxides

Advanced Materials, Год журнала: 2022, Номер 34(16)

Опубликована: Фев. 22, 2022

Electrocatalytic hydrogen peroxide (H2 O2 ) synthesis via the two-electron oxygen reduction reaction (2e ORR) pathway is becoming increasingly important due to green production process. Here, cationic vacancies on nickel phosphide, as a proof-of-concept regulate catalyst's physicochemical properties, are introduced for efficient H2 electrosynthesis. The as-fabricated Ni (VNi )-enriched Ni2-x P-VNi electrocatalyst exhibits remarkable 2e ORR performance with molar fraction of >95% and Faradaic efficiencies >90% in all pH conditions under wide range applied potentials. Impressively, as-created VNi possesses superb long-term durability over 50 h, suppassing recently reported catalysts Operando X-ray absorption near-edge spectroscopy (XANES) synchrotron Fourier transform infrared (SR-FTIR) combining theoretical calculations reveal that excellent catalytic originates from -induced geometric electronic structural optimization, thus promoting adsorption favored "end-on" configuration. It believed demonstrated cation vacancy engineering an effective strategy toward creating active heterogeneous atomic precision.

Язык: Английский

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Freestanding Metal–Organic Frameworks and Their Derivatives: An Emerging Platform for Electrochemical Energy Storage and Conversion

Chemical Reviews, Год журнала: 2022, Номер 122(11), С. 10087 - 10125

Опубликована: Апрель 21, 2022

Metal–organic frameworks (MOFs) have recently emerged as ideal electrode materials and precursors for electrochemical energy storage conversion (EESC) owing to their large specific surface areas, highly tunable porosities, abundant active sites, diversified choices of metal nodes organic linkers. Both MOF-based MOF-derived in powder form been widely investigated relation synthesis methods, structure morphology controls, performance advantages targeted applications. However, engage them applications, both binders additives would be required postprocessed electrodes, fundamentally eliminating some the sites thus degrading superior effects MOF-based/derived materials. The advancement freestanding electrodes provides a new promising platform EESC thanks apparent merits, including fast electron/charge transmission seamless contact between current collectors. Benefiting from synergistic effect structures materials, outstanding can achieved, stimulating increasing enthusiasm recent years. This review timely comprehensive overview on structural features fabrication techniques electrodes. Then, latest advances are summarized devices electrocatalysis. Finally, insights into currently faced challenges further perspectives these feasible solutions discussed, aiming at providing set guidance promote development scale-up production commercial

Язык: Английский

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Design Engineering, Synthesis Protocols, and Energy Applications of MOF-Derived Electrocatalysts

Nano-Micro Letters, Год журнала: 2021, Номер 13(1)

Опубликована: Июнь 1, 2021

The core reactions for fuel cells, rechargeable metal-air batteries, and hydrogen production are the oxygen reduction reaction (ORR), evolution (OER), (HER), which heavily dependent on efficiency of electrocatalysts. Enormous attempts have previously been devoted in non-noble electrocatalysts born out metal-organic frameworks (MOFs) ORR, OER, HER applications, due to following advantageous reasons: (i) significant porosity eases electrolyte diffusion; (ii) supreme catalyst-electrolyte contact area enhances diffusion efficiency; (iii) electronic conductivity can be extensively increased owing unique construction block subunits MOFs-derived electrocatalysis. Herein, recent progress including synthesis protocols, design engineering, DFT calculations roles, energy applications is discussed reviewed. It concluded that elevated performances attributed an advantageously well-designed high-porosity structure, surface area, plentiful active centers. Furthermore, perspectives MOF-derived presented.

Язык: Английский

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2D MOFs and their derivatives for electrocatalytic applications: Recent advances and new challenges

Coordination Chemistry Reviews, Год журнала: 2022, Номер 472, С. 214777 - 214777

Опубликована: Авг. 19, 2022

Язык: Английский

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Competitive Coordination‐Oriented Monodispersed Ruthenium Sites in Conductive MOF/LDH Hetero‐Nanotree Catalysts for Efficient Overall Water Splitting in Alkaline Media

Advanced Materials, Год журнала: 2022, Номер 34(12)

Опубликована: Янв. 11, 2022

Rational exploration of efficient, inexpensive, and robust electrocatalysts is critical for the efficient water splitting. Conjugated conductive metal-organic frameworks (cMOFs) with multicomponent layered double hydroxides (LDHs) to construct bifunctional heterostructure catalysts are considered as an but complicated strategy. Here, fabrication a cMOF/LDH hetero-nanotree array catalyst (CoNiRu-NT) coupled monodispersed ruthenium (Ru) sites via controllable grafted-growth strategy reported. Rich-amino hexaiminotriphenylene linkers coordinate LDH nanotrunk form cMOF nanobranches, providing numerous anchoring precisely confine stabilize RuN4 sites. Moreover, reduced Ru moieties facilitate H2 O adsorption dissociation, heterointerface between further modifies chemical electronic structures. Optimized CoNiRu-NT displays significant increase in electrochemical water-splitting properties alkaline media, affording low overpotentials 22 mV at 10 mA cm-2 255 20 hydrogen evolution reaction oxygen reaction, respectively. In actual system, drives overall splitting cell voltage 1.47 V reach . This performance comparable that pure noble-metal-based materials superior most reported MOF-based catalysts.

Язык: Английский

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Rational design of multifunctional electrocatalyst: An approach towards efficient overall water splitting and rechargeable flexible solid-state zinc–air battery

Applied Catalysis B Environment and Energy, Год журнала: 2021, Номер 300, С. 120752 - 120752

Опубликована: Сен. 28, 2021

Язык: Английский

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Molybdenum Dioxide Nanoparticles Anchored on Nitrogen‐Doped Carbon Nanotubes as Oxidative Desulfurization Catalysts: Role of Electron Transfer in Activity and Reusability

Advanced Functional Materials, Год журнала: 2021, Номер 31(22)

Опубликована: Март 21, 2021

Abstract Electron transfer between metal‐oxides and supports considerably affects the oxidative desulfurization (ODS) performance of catalysts, while this is far from being well understood. Herein, molybdenum dioxide with oxygen vacancies (V O ‐MoO 2 ) catalysts derived Mo‐based metal‐organic frameworks are anchored on electron‐rich nitrogen‐doped carbon nanotubes (NC) to obtain excellent ODS activity reusability. Results show that either dibenzothiophene (DBT) or 4,6‐dimethyldibenzothiophene (4,6‐DMDBT) removed 100% composite catalyst @NC) within 40 min reaction when cumene hydroperoxide chosen as an oxidant. After five cycles reaction, DBT 4,6‐DMDBT removal still exceeded 99.5 95.0%, respectively. density functional theory calculations characterizations confirm strong electron‐donating effect NC V can promote dispersion reduce bond energy MoO bond, leading exposure active sites enrichment ). Furthermore, interfacial electrostatic interaction caused by electron leaching catalyst. This study provides a versatile strategy constructing electronic metal‐oxide support via anchoring for design high‐performance catalysts.

Язык: Английский

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Current Progress in 2D Metal–Organic Frameworks for Electrocatalysis

Small Structures, Год журнала: 2022, Номер 4(6)

Опубликована: Сен. 16, 2022

The 2D nanosheets of metal–organic frameworks (MOFs) have recently emerged as a promising material that makes them valuable in widespread electrocatalytic fields due to their atomic‐level thickness, abundant active sites, and large surface area. Efficient electrocatalysts for hydrogen evolution reaction (HER), oxygen (OER), overall water splitting are highly desired with low overpotentials promote the industrial applications energy conversion devices. MOF nanostructures provide long‐term stability high electrical conductivity enhance catalyst activity durability. This review briefly summarizes synthesis HER/OER/water splitting. More attention is focused on synthetic strategies derivatives. catalytic performance superior properties these materials highlighted. outperformance originates from rational design, myriad thickness. current future challenges this field scientific perspectives overcome It suggested construction can develop state‐of‐the‐art electrocatalyst environmental division.

Язык: Английский

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