Surface carbon layer controllable Ni3Fe particles confined in hierarchical N-doped carbon framework boosting oxygen evolution reaction

Advanced Powder Materials, Год журнала: 2021, Номер 1(2), С. 100020 - 100020

Опубликована: Дек. 10, 2021

Developing high-efficiency and low-cost catalysts towards oxygen evolution reaction (OER) is extremely important for overall water splitting rechargeable metal−air batteries. Herein we propose a promising organometallic coordination polymer (OCP) induced strategy to construct hierarchical N-doped carbon framework with NiFe nanoparticles encapsulated inside (Nx[email protected]–C) as highly active stable OER catalyst. The synthesis of OCP precursor depends on the unique molecular structure iminodiacetonitrile (IDAN), which can coordinate metal ions form Ni2Fe(CN)6 prussian blue analogs (PBA) structure. Unlike previous PBA-induced methods, thickness layer covering surface core be well controlled during pyrolysis through adjusting amount IDAN, builds wonderful bridge investigating relationship between catalytic performance. Both experimental characterizations theoretical studies validate that suitable layers leads optimal activity stability. By optimizing composition, optimized Ni3[email protected]–C exhibits low overpotentials (260 ​mV at 10 ​mA ​cm−2; 320 50 ​cm−2), improved kinetics (79 dec−1), robust long-term stability, exceeds those benchmark RuO2.

Язык: Английский

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Synergetic Metal Defect and Surface Chemical Reconstruction into NiCo₂S₄/ZnS Heterojunction to Achieve Outstanding Oxygen Evolution Performance

Angewandte Chemie International Edition, Год журнала: 2021, Номер 60(35), С. 19435 - 19441

Опубликована: Июнь 21, 2021

Abstract Defect and interface engineering are recognized as effective strategies to regulate electronic structure improve activity of metal sulfide. However, the practical application sulfide is restricted by their low conductivity rapid decline in derived from large volume fluctuation during electrocatalysis process. More importantly, determination exact active site complicated due inevitable electrochemical reconstruction. Herein, ZnS nanoparticles with Zn defect anchored onto surface NiCo 2 S 4 nanosheet construct /ZnS hybrids, which exhibit outstanding oxygen evolution performance an ultralow overpotential 140 mV. The anchoring defective inhibit expansion cycling Density‐functional theory reveals that build‐in interfacial potential can facilitate thermodynamic formation *O *OOH, thus intrinsic activity.

Язык: Английский

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N‐Doped Carbon Nanotubes Derived from Graphene Oxide with Embedment of FeCo Nanoparticles as Bifunctional Air Electrode for Rechargeable Liquid and Flexible All‐Solid‐State Zinc–Air Batteries

Advanced Science, Год журнала: 2021, Номер 8(10)

Опубликована: Март 16, 2021

This work reports a novel approach for the synthesis of FeCo alloy nanoparticles (NPs) embedded in N,P-codoped carbon coated nitrogen-doped nanotubes (NPC/FeCo@NCNTs). Specifically, NCNT is achieved by calcination graphene oxide-coated polystyrene spheres with Fe

Язык: Английский

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Advanced Oxygen Electrocatalyst for Air-Breathing Electrode in Zn-Air Batteries

ACS Applied Materials & Interfaces, Год журнала: 2021, Номер 13(34), С. 40172 - 40199

Опубликована: Авг. 23, 2021

The electrochemical reduction of oxygen to water and the evolution from are two important electrode reactions extensively studied for development energy conversion storage technologies based on electrocatalysis. an inexpensive, highly active, durable nonprecious-metal-based electrocatalyst is indispensable emerging technologies, including anion exchange membrane fuel cells, metal-air batteries (MABs), electrolyzers, etc. activity largely decides overall performance these devices. Although catalytic activities Pt Ru/Ir-based catalysts toward reaction (ORR) (OER) known, high cost lack durability limit their extensive use practical applications. This review article highlights electrocatalytic non-Pt non-Ru/Ir electrocatalysts transition-metal-based random alloys, intermetallics, metal-coordinated nitrogen-doped carbon (M–N–C), transition metal phosphides, nitrides, etc., air-breathing aqueous primary secondary zinc-air (ZABs). Rational surface chemical engineering required achieve desired activity. increases number active sites, whereas enhances intrinsic catalyst. encapsulation or integration catalyst with undoped heteroatom-doped nanostructures affords enhanced In many cases, synergistic effect between matrix plays role in controlling ORR evaluated terms onset potential, electrons transferred, limiting current density, durability. bifunctional ZAB performance, other hand, measured potential gap OER, ΔE = Ej10OER – E1/2ORR, specific capacity, peak power open circuit voltage, voltaic efficiency, charge–discharge cycling stability. nonprecious electrocatalyst-based ZABs very promising they deliver round-trip efficiency. site electrocatalysis challenges associated support briefly addressed. Despite considerable progress made recent years, several issues yet be addressed commercial rechargeable

Язык: Английский

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Electronic modulation optimizes OH* intermediate adsorption on Co-Nx-C sites via coupling CoNi alloy in hollow carbon nanopolyhedron toward efficient reversible oxygen electrocatalysis

Applied Catalysis B Environment and Energy, Год журнала: 2021, Номер 304, С. 121006 - 121006

Опубликована: Дек. 10, 2021

Язык: Английский

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Designing superior bifunctional electrocatalyst with high-purity pyrrole-type CoN4 and adjacent metallic cobalt sites for rechargeable Zn-air batteries

Energy storage materials, Год журнала: 2022, Номер 46, С. 553 - 562

Опубликована: Янв. 22, 2022

Язык: Английский

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FeCo Nanoparticles Encapsulated in N‐Doped Carbon Nanotubes Coupled with Layered Double (Co, Fe) Hydroxide as an Efficient Bifunctional Catalyst for Rechargeable Zinc–Air Batteries

Small, Год журнала: 2021, Номер 17(44)

Опубликована: Сен. 22, 2021

Low-cost bifunctional nonprecious metal catalysts toward oxygen reduction reaction (ORR) and evolution (OER) are critical for the commercialization of rechargeable zinc-air batteries (ZABs). However, preparation highly active durable is still challenging. Herein, an efficient catalyst reported consisting FeCo nanoparticles embedded in N-doped carbon nanotubes (FeCo NPs-N-CNTs) by situ catalytic strategy. Due to encapsulation porous structure nanotubes, shows high activity ORR excellent durability. Furthermore, enhance OER activity, CoFe-layer double hydroxide (CoFe-LDH) coupled with NPs-N-CNTs approach. As air electrode ZABs, cell CoFe-LDH@FeCo exhibits open-circuit potential (OCP) 1.51 V, power density 116 mW cm-2 , remarkable durability up 100 h, demonstrating its great promise practical application ZABs.

Язык: Английский

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Decorating Single‐Atomic Mn Sites with FeMn Clusters to Boost Oxygen Reduction Reaction

Angewandte Chemie International Edition, Год журнала: 2022, Номер 62(3)

Опубликована: Ноя. 19, 2022

The regulation of electron distribution single-atomic metal sites by atomic clusters is an effective strategy to boost their intrinsic activity oxygen reduction reaction (ORR). Herein we report the construction Mn decorated with innovative combination post-adsorption and secondary pyrolysis. X-ray absorption spectroscopy confirms formation via Mn-N4 coordination bonding FeMn (FeMnac /Mn-N4 C), which has been demonstrated theoretically be conducive adsorption molecular O2 break O-O bond during ORR process. Benefiting from structural features above, FeMnac C catalyst exhibits excellent half-wave potential 0.79 V in 0.5 M H2 SO4 0.90 0.1 KOH as well preeminent Zn-air battery performance. Such synthetic may open up a route construct highly active catalysts tunable structures for diverse applications.

Язык: Английский

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Modulating the Electronic Structure of FeCo Nanoparticles in N‐Doped Mesoporous Carbon for Efficient Oxygen Reduction Reaction

Advanced Science, Год журнала: 2022, Номер 9(15)

Опубликована: Март 24, 2022

The development of highly efficient and stable oxygen reduction electrocatalysts revealing their underlying catalytic mechanism are crucial in expanding the applications metal-air batteries. Herein, an excellent FeCo alloy nanoparticles (NPs)-decorated N-doped mesoporous carbon electrocatalyst (FeCo/NC) for reaction, prepared through pyrolysis a dual metal containing metal-organic framework composite scaffold is reported. Benefiting from exposed bimetal active sites carefully designed structure, Fe0.25 Co0.75 /NC-800 catalyst exhibits promising electrocatalytic activity superior durability, better than those state-of-the-art catalysts. Suggested by both X-ray absorption fine structures density functional theoretical calculation, outstanding performance originated synergistic effects bimetallic loading NC catalysts, where electronic modulation Co nearby Fe species leads to optimized binding strength reaction intermediates. This work demonstrates class nonprecious metals provides valuable insights into investigating structure-performance relationship transition metal-based

Язык: Английский

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Adding Fe/dicyandiamide to Co-MOF to greatly improve its ORR/OER bifunctional electrocatalytic activity

Applied Catalysis B Environment and Energy, Год журнала: 2023, Номер 341, С. 123346 - 123346

Опубликована: Сен. 27, 2023

Язык: Английский

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