Metal-organic framework-polymer complex-derived single-atomic oxygen reduction catalyst for anion exchange membrane fuel cells

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 481, P. 148508 - 148508

Published: Jan. 4, 2024

Language: Английский

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Size-dependent activity of Fe-N-doped mesoporous carbon nanoparticles towards oxygen reduction reaction

Green Carbon, Journal Year: 2024, Volume and Issue: 2(2), P. 221 - 230

Published: April 1, 2024

The rational design of Fe-N-C catalysts that possess easily accessible active sites and favorable mass transfer, which are usually determined by the structure catalyst supports, is crucial for oxygen reduction reaction (ORR). In this study, an oleic acid-assisted soft-templating approach developed to synthesize size-controlled nitrogen-doped carbon nanoparticles (ranging from 130 nm 60 35 nm, respectively) feature spiral mesopores on their surface (SMCs). Next, atomically dispersed Fe-Nx fabricated size-tunable SMCs (Fe1/SMC-x, where x represents SMC size) size-dependent activity toward ORR investigated. It found catalytic performance Fe1/SMCs significantly influenced size SMCs, Fe1/SMC-60 shows highest with a half-wave potential 0.90 V vs. RHE in KOH electrolyte, indicating gas-liquid-solid three-phase interface enhances accessibility sites. addition, when using as cathode aqueous zinc-air batteries (ZABs), it delivers higher open-circuit voltage (1.514 V), greater power density (223 mW cm-2), larger specific capacity/energy than Pt/C-based counterparts. These results further highlight practical energy devices associated importance synthesis SMCs.

Language: Английский

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Promoting Electrocatalytic Oxygen Reactions Using Advanced Heterostructures for Rechargeable Zinc–Air Battery Applications

ACS Nano, Journal Year: 2024, Volume and Issue: 18(33), P. 21651 - 21684

Published: Aug. 12, 2024

In order to facilitate electrochemical oxygen reactions in electrically rechargeable zinc-air batteries (ZABs), there is a need develop innovative approaches for efficient electrocatalysts. Due their reliability, high energy density, material abundance, and ecofriendliness, ZABs hold promise as next-generation storage conversion devices. However, the large-scale application of currently hindered by slow kinetics reduction reaction (ORR) evolution (OER). development heterostructure-based electrocatalysts has potential surpass limitations imposed intrinsic properties single material. This Account begins with an explanation configurations fundamentals electrochemistry air electrode. Then, we summarize recent progress respect variety heterostructures that exploit bifunctional electrocatalytic overview impact on ZAB performance. The range heterointerfacial engineering strategies improving ORR/OER performance includes tailoring surface chemistry, dimensionality catalysts, interfacial charge transfer, mass transport, morphology. We highlight multicomponent design take these features into account create advanced highly active catalysts. Finally, discuss challenges future perspectives this important topic aim enhance activity batteries.

Language: Английский

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Multiscale Understanding of Anion Exchange Membrane Fuel Cells: Mechanisms, Electrocatalysts, Polymers, and Cell Management

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 10, 2025

Abstract Anion exchange membrane fuel cells (AEMFCs) are among the most promising sustainable electrochemical technologies to help solve energy challenges. Compared proton (PEMFCs), AEMFCs offer a broader choice of catalyst materials and less corrosive operating environment for bipolar plates membrane. This can lead potentially lower costs longer operational life than PEMFCs. These significant advantages have made highly competitive in future cell market, particularly after advancements developing non‐platinum‐group‐metal anode electrocatalysts, anion membranes ionomers, understanding relationships between conditions mass transport AEMFCs. review aims compile recent literature provide comprehensive three key areas: i) mechanisms hydrogen oxidation reaction (HOR) oxygen reduction (ORR) alkaline media; ii) synthesis routes structure‐property cutting‐edge HOR ORR as well ionomers; iii) conditions, including water management impact CO 2 . Finally, based on these aspects, development perspectives proposed.

Language: Английский

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Hybrid high-performance oxygen reduction reaction Fe–N–C electrocatalyst for anion exchange membrane fuel cells

International Journal of Hydrogen Energy, Journal Year: 2024, Volume and Issue: 62, P. 849 - 858

Published: March 16, 2024

Language: Английский

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Lignin-Derived Precious Metal-Free Electrocatalysts for Anion-Exchange Membrane Fuel Cell Application

ACS Catalysis, Journal Year: 2024, Volume and Issue: 14(12), P. 9224 - 9234

Published: June 3, 2024

A facile method for the preparation of precious metal-free catalysts oxygen reduction reaction (ORR) from lignin, dicyandiamide, and transition metal salts is presented. Magnesium acetate was employed as a precursor sacrificial template, enhancing porous structure catalysts. Iron content in catalyst materials optimized bimetallic containing Fe Co also prepared. The physicochemical analysis revealed uniform dispersion various nitrogen moieties centers on sheet-like carbon structures, along with some carbon-encapsulated metal-rich nanoparticles. Rotating disc electrode tests an alkaline solution demonstrated dependence ORR performance their iron confirmed high stability both over 10,000 potential cycles. Anion-exchange membrane fuel cell (AEMFC) studies that outperforms Fe-containing material, achieving very promising peak power density 675 mW cm–2 at 60 °C 833 80 °C.

Language: Английский

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Single-Atom Catalysts through Pressure-Controlled Metal Diffusion

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(29), P. 19886 - 19895

Published: July 11, 2024

Single-atom catalysts (SACs) open up new possibilities for advanced technologies. However, a major complication in preparing high-density single-atom sites is the aggregation of single atoms into clusters. This stems from delicate balance between diffusion and stabilization metal during pyrolysis. Here, we present pressure-controlled as concept fabricating ultra-high-density SACs. Reducing pressure inhibits substantially, resulting almost three times higher loadings than those obtained at ambient pressure. Molecular dynamics computational fluid simulations reveal role hopping mechanism, maximizing atom distribution through an increased probability metal–ligand binding. The investigation active site density by electrocatalytic oxygen reduction validates robustness our approach. first realization Ullmann-type carbon–oxygen couplings catalyzed on Cu demonstrates further options efficient heterogeneous catalysis.

Language: Английский

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Catalyzing oxygen reduction by morphologically engineered ZIF-derived carbon composite catalysts in dual-chamber microbial fuel cells

Journal of environmental chemical engineering, Journal Year: 2024, Volume and Issue: 12(2), P. 112242 - 112242

Published: Feb. 17, 2024

Language: Английский

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Zinc-assisted synthesis of polymer framework-based atomically dispersed bimetal catalysts for efficient oxygen electrocatalysis in rechargeable zinc-air batteries

Journal of Energy Storage, Journal Year: 2024, Volume and Issue: 86, P. 111164 - 111164

Published: March 9, 2024

Language: Английский

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ZIF-8 derived iron-, sulphur-, and nitrogen-doped catalysts for anion-exchange membrane fuel cell application

Renewable Energy, Journal Year: 2024, Volume and Issue: 228, P. 120613 - 120613

Published: May 5, 2024

Language: Английский

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