Iron phthalocyanine with coordination induced electronic localization to boost oxygen reduction reaction

Nature Communications, Journal Year: 2020, Volume and Issue: 11(1)

Published: Aug. 20, 2020

Abstract Iron phthalocyanine (FePc) is a promising non-precious catalyst for the oxygen reduction reaction (ORR). Unfortunately, FePc with plane-symmetric FeN 4 site usually exhibits an unsatisfactory ORR activity due to its poor O 2 adsorption and activation. Here, we report axial Fe–O coordination induced electronic localization strategy improve adsorption, activation thus performance. Theoretical calculations indicate that evokes among direction of O–FeN sites enhance To realize this speculation, coordinated oxidized carbon. Synchrotron X-ray absorption Mössbauer spectra validate between The obtained fast kinetics ultralow Tafel slope 27.5 mV dec −1 remarkable half-wave potential 0.90 V. This work offers new regulate catalytic better

Language: Английский

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Atomically Dispersed Fe–Co Dual Metal Sites as Bifunctional Oxygen Electrocatalysts for Rechargeable and Flexible Zn–Air Batteries

ACS Catalysis, Journal Year: 2022, Volume and Issue: 12(2), P. 1216 - 1227

Published: Jan. 5, 2022

Single-metal site catalysts have exhibited highly efficient electrocatalytic properties due to their unique coordination environments and adjustable local structures for reactant adsorption electron transfer. They been widely studied many electrochemical reactions, including oxygen reduction reaction (ORR) evolution (OER). However, it remains a significant challenge realize high-efficiency bifunctional catalysis (ORR/OER) with single-metal-type active sites. Herein, we report atomically dispersed Fe–Co dual metal sites (FeCo–NC) derived from Fe Co co-doped zeolitic imidazolate frameworks (ZIF-8s), aiming build up multiple ORR/OER catalysts. The FeCo–NC catalyst shows excellent catalytic activity in alkaline media the ORR (E1/2 = 0.877 V) OER (Ej=10 1.579 V). Moreover, its outstanding stability during is comparable noble-metal (Pt/C RuO2). atomic dispersion state, structure, charge density difference of were characterized determined using advanced physical characterization functional theory (DFT) calculations. FeCo–N6 moieties are likely main simultaneously improved performance relative traditional single We further incorporated into an air electrode fabricating rechargeable flexible Zn–air batteries, generating superior power (372 mW cm–2) long-cycle (over 190 h) stability. This work would provide method design synthesize multi-metal electrocatalysis.

Language: Английский

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Designing Atomic Active Centers for Hydrogen Evolution Electrocatalysts

Angewandte Chemie International Edition, Journal Year: 2020, Volume and Issue: 59(47), P. 20794 - 20812

Published: Jan. 8, 2020

The evolution of hydrogen from water using renewable electrical energy is a topic current interest. Pt/C exhibits the highest catalytic activity for H2 reaction (HER), but scarce supplies and high cost limit its large-scale application. Atomic active centers in single-atom catalysts, alloys, catalysts with two atom sorts exhibit maximum atomic efficiency, unique structure, exceptional HER. Interactions between well-defined sites supports are known to affect electron transfer dramatically accelerate reaction. This Review first highlights methods studying Then, different coordination configurations described. Active one metal atom, atoms as well nonmetal analyzed at scale. Finally, future research perspectives proposed.

Language: Английский

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Bifunctional electrocatalysts for Zn–air batteries: recent developments and future perspectives

Journal of Materials Chemistry A, Journal Year: 2020, Volume and Issue: 8(13), P. 6144 - 6182

Published: Jan. 1, 2020

The latest developments of bifunctional oxygen electrocatalysts for Zn–air batteries (ZABs) are comprehensively summarized and evaluated, laying special emphasis on the challenges, outlooks directions future research ZAB industry.

Language: Английский

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Single Atom Catalysts for Fuel Cells and Rechargeable Batteries: Principles, Advances, and Opportunities

ACS Nano, Journal Year: 2021, Volume and Issue: 15(1), P. 210 - 239

Published: Jan. 6, 2021

Owing to the energy crisis and environmental pollution, developing efficient robust electrochemical storage (or conversion) systems is urgently needed but still very challenging. Next-generation conversion devices, mainly including fuel cells, metal-air batteries, metal-sulfur metal-ion have been viewed as promising candidates for future large-scale applications. All these are operated through one type of chemical mechanism, which currently limited by poor reaction kinetics. Single atom catalysts (SACs) perform maximum efficiency well-defined active sites. They employed electrode components enhance redox kinetics adjust interactions at interface, boosting device performance. In this Review, we briefly summarize related background knowledge, motivation working principle toward next-generation Zn-air Al-air Li-air Li-CO2 Li-S Na-S batteries. While pointing out remaining challenges in each system, clarify importance SACs solve development bottlenecks. Then, further explore current progress various systems. Finally, opportunities perspectives devices discussed.

Language: Английский

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Atomically Dispersed Fe–Heteroatom (N, S) Bridge Sites Anchored on Carbon Nanosheets for Promoting Oxygen Reduction Reaction

ACS Energy Letters, Journal Year: 2021, Volume and Issue: 6(2), P. 379 - 386

Published: Jan. 6, 2021

Single Fe atom dispersed carbon nanostructures show promising oxygen reduction reaction (ORR) activities for renewable energy applications. Nevertheless, the microenvironment of single atoms needs to be further engineered optimize catalytic performance, which is challenging. In this work, we develop a NaCl-template pyrolysis method fabricate catalysts with atomically Fe–heteroatom (N, S) bridge sites anchored on nanosheets. The N and S coordinated atomic (FeN3S) are found induce charge redistribution, lowering binding strength oxygenated intermediates leading fast kinetics good activity. Our work provides an effective regulate single-atom optimizing electrocatalytic performance.

Language: 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, Journal Year: 2021, Volume and Issue: 8(10)

Published: March 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

Language: Английский

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Sustainable zinc–air battery chemistry: advances, challenges and prospects

Chemical Society Reviews, Journal Year: 2023, Volume and Issue: 52(17), P. 6139 - 6190

Published: Jan. 1, 2023

Sustainable zinc-air batteries (ZABs) are considered promising energy storage devices owing to their inherent safety, high density, wide operating temperature window, environmental friendliness, etc., showing great prospect for future large-scale applications. Thus, tremendous efforts have been devoted addressing the critical challenges associated with sustainable ZABs, aiming significantly improve efficiency and prolong operation lifespan. The growing interest in ZABs requires in-depth research on oxygen electrocatalysts, electrolytes, Zn anodes, which not systematically reviewed date. In this review, fundamentals of electrocatalysts air cathodes, physicochemical properties ZAB issues strategies stabilization anodes summarized from perspective fundamental characteristics design principles. Meanwhile, significant advances situ/operando characterization highlighted provide insights into reaction mechanism dynamic evolution electrolyte|electrode interface. Finally, several thoughts perspectives provided regarding opportunities ZABs. Therefore, review provides a thorough understanding advanced chemistry, hoping that timely comprehensive can shed light upcoming horizons prosperous area.

Language: Английский

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NiCo-LDH/Ti3C2 MXene hybrid materials for lithium ion battery with high-rate capability and long cycle life

Journal of Energy Chemistry, Journal Year: 2020, Volume and Issue: 50, P. 143 - 153

Published: March 19, 2020

Language: Английский

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Electrospun Inorganic Nanofibers for Oxygen Electrocatalysis: Design, Fabrication, and Progress

Advanced Energy Materials, Journal Year: 2020, Volume and Issue: 10(45)

Published: Oct. 27, 2020

Abstract Electrospinning has received tremendous attention in terms of the design and fabrication 1D nanofibers for oxygen electrocatalysis fuel cells metal‐air batteries, owing to their high surface area, short charge transport path, superior chemical stability, etc. In this review, a brief introduction is given cells, operation principle electrospinning. After that, recent progress noble‐metal‐free electrocatalysts prepared through electrospinning, mainly containing heteroatoms‐doped electrospun carbon (ECNFs), ECNFs functionalized with transition metal nanoparticles compounds (alloy, oxides, carbides, nitrides, sulfides, phosphides), unique nanostructured metal‐nitrogen‐ECNFs (including single‐atom catalysts) are summarized. section, electrodes self‐standing peculiarity emphasized. Next, other kinds based on carbides as or hybrid materials also discussed. Finally, prospects possible future research direction NFs‐based presented. This comprehensive review anticipated be valuable helpful context understanding advanced energy conversion storage devices.

Language: Английский

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