Noble metal-free FeCoNiMnV high entropy alloy anchored on N-doped carbon nanotubes with prominent activity and durability for oxygen reduction and zinc–air batteries

Journal of Colloid and Interface Science, Journal Year: 2024, Volume and Issue: 662, P. 149 - 159

Published: Feb. 7, 2024

Language: Английский

---

Highly Reversible Zn–Air Batteries Enabled by Tuned Valence Electron and Steric Hindrance on Atomic Fe–N₄–C Sites

Nano Letters, Journal Year: 2024, Volume and Issue: 24(15), P. 4672 - 4681

Published: April 8, 2024

The bifunctional oxygen electrocatalyst is the Achilles' heel of achieving robust reversible Zn–air batteries (ZABs). Herein, durable electrocatalysis in alkaline media realized on atomic Fe–N4–C sites reinforced by NixCo3–xO4 (NixCo3–xO4@Fe1/NC). Compared with that pristine Fe1/NC, stability evolution reaction (OER) increased 10 times and reduction (ORR) performance also improved. steric hindrance alters valence electron at sites, resulting a shorter Fe–N bond enhanced sites. corresponding solid-state ZABs exhibit an ultralong lifespan (>460 h 5 mA cm–2) high rate (from 2 to 50 cm–2). Furthermore, structural NixCo3–xO4@Fe1/NC before after OER ORR as well charge–discharge cycling explored. This work develops efficient strategy for improving possibly other processes.

Language: Английский

---

Physical upcycling of spent artificial diamond accelerant into bifunctional oxygen electrocatalyst with dual-metal active sites for durable rechargeable Zn–air batteries

Nano Energy, Journal Year: 2024, Volume and Issue: 121, P. 109270 - 109270

Published: Jan. 9, 2024

Language: Английский

---

State-of-the-art advancements in single atom electrocatalysts originating from MOFs for electrochemical energy conversion

CHINESE JOURNAL OF CATALYSIS (CHINESE VERSION), Journal Year: 2024, Volume and Issue: 59, P. 38 - 81

Published: April 1, 2024

Language: Английский

---

Atomically dispersed multi-site catalysts: bifunctional oxygen electrocatalysts boost flexible zinc–air battery performance

Energy & Environmental Science, Journal Year: 2024, Volume and Issue: 17(14), P. 4847 - 4870

Published: Jan. 1, 2024

Based on the advancements in atomically dispersed multi-site catalysts for FZABs, this review discusses design methodologies to regulate performance of bifunctional oxygen electrocatalysts from electronic and geometric structures.

Language: Английский

---

Spinel‐Type Metal Oxides with Tailored Amorphous/Crystalline Heterointerfaces for Enhanced Electrocatalytic Water Splitting

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Aug. 15, 2024

Abstract Metal oxides with spinel structure have garnered increasing attention as promising alternatives to noble metal‐based electrocatalysts. However, these electrocatalysts often fail simultaneously exhibit high activity and stability for both hydrogen evolution reaction (HER) oxygen (OER), limiting their applications in electrocatalytic water splitting. Herein, crystalline/amorphous heterogeneous interfaces are successfully introduced into NiCo 2 O 4 nanosheets, which grown situ on carbon cloth (CC), denoted ‐B‐CC. The amorphous/crystalline heterostructures combine the advantages of phases amorphous phase nanosheets modulates electron density, provides abundant single vacancies active sites, enhances corrosion resistance, while crystalline improves conductivity. Density functional theory (DFT) calculations performed investigate influence surface vacancy (SV ) OER HER processes. NiCo₂O₄‐B‐CC exhibits overpotentials only 26 mV 215 at a current density 10 mA cm −2 . It excellent performance splitting, achieving 400 an applied voltage 2.0 V. construction novel approach enhancing metal

Language: Английский

---

Biphase Alloy Nanoheterojunction Encapsulated within N‐Doped Carbon Nanotubes as Bifunctional Oxygen Electrocatalyst for High‐Performance Zn‐Air and Mg‐Air Batteries

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

Published: Jan. 10, 2025

Abstract N‐doped carbon confined alloy catalysts possess considerable potential in facilitating oxygen electrocatalytic reaction and consequent applications metal air batteries, but the sluggish catalytic kinetics high barrier of reduction (ORR) remain bottleneck restricting its further development. Here, a novel CoFe‐NiFe biphase nanoheterojunction encapsulated within nanotubes (CoFe‐NiFe@NCNT) is fabricated via hydrothermal carbothermic approach. Owing to plentiful active sites electrical conductance, difference between OER ORR amounts merely 0.68 V. Simultaneously, performance Zn‐air Mg‐air batteries assembled by CoFe‐NiFe@NCNT serving as air‐cathode are superior that commercial Pt/C + RuO 2 . The DFT outcomes reveal transformation *OOH *O rate‐determining step (RDS) ORR/OER. Also, synergy heterojunction conducive reduce energy barrier. This study offers profound understanding toward structural design electrocatalysts utilization metal‐air for portable wearable electronic apparatuses.

Language: Английский

---

Polyvinylpyrrolidone-induced size-dependent catalytic behavior of Fe sites on N-doped carbon substrate and mechanism conversion in Fenton-like oxidation reaction

Applied Catalysis B Environment and Energy, Journal Year: 2023, Volume and Issue: 341, P. 123323 - 123323

Published: Sept. 24, 2023

Language: Английский

---

Recent advances in Fe‐N‐C single‐atom site coupled synergistic catalysts for boosting oxygen reduction reaction

Electron, Journal Year: 2024, Volume and Issue: 2(1)

Published: Feb. 1, 2024

Abstract Metal–air batteries, fuel cells, and electrochemical H 2 O production currently attract substantial consideration in the energy sector owing to their efficiency eco‐consciousness. However, broader use is hindered by complex oxygen reduction reaction (ORR) that occurs at cathodes involves intricate electron transfers. Despite significant ORR performance of platinum‐based catalysts, high cost, operational limitations, susceptibility methanol poisoning hinder implementation. This emphasizes need for efficient non‐precious metal‐based electrocatalysts. A promising approach utilizing single‐atom catalysts (SACs) featuring metal–nitrogen–carbon (M‐N‐C) coordination sites. SACs offer advantages such as optimal utilization metal atoms, uniform active centers, precisely defined catalytic sites, robust metal–support interactions. symmetrical distribution around central atom a site (M‐N 4 ) often results suboptimal performance. challenge can be addressed carefully tailoring surrounding environment center. review specifically focuses on recent advancements Fe‐N within Fe‐N‐C SACs. It highlights strategy coupling sites with clusters and/or nanoparticles, which enhances intrinsic activity. By capitalizing interplay between associated species, overall improved. The combines findings from experimental studies density functional theory simulations, covering synthesis strategies coupled synergistic characterization techniques, influence particles offering comprehensive outlook, aims encourage research into high‐efficiency Fe real‐world applications coming years.

Language: Английский

---

Boron in the Second Coordination Sphere of Fe Single Atom Boosts the Oxygen Reduction Reaction

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(13), P. 16224 - 16231

Published: March 21, 2024

Metal single atoms coordinated with four nitrogen (M1N4) are regarded as tremendously promising catalysts for the electrocatalytic oxygen reduction reaction (ORR). Nevertheless, strong bond intensity between metal center and O atom in oxygen-containing intermediates significantly limits ORR activity of M1N4. Herein, catalytically active B is successfully introduced into second coordination sphere Fe (Fe1N4-B-C) to realize alternative binding thus facilitate activity. Compared pristine Fe1N4 catalyst, synthesized Fe1N4-B-C catalyst exhibits improved catalytic capability a half-wave potential (E1/2) 0.80 V kinetic current density (JK) 5.32 mA cm–2 acid electrolyte. Moreover, an alkaline electrolyte, displays remarkable E1/2 0.87 JK 8.94 at 0.85 V, outperforming commercial Pt/C. Notably, mechanistic study has revealed that shell which avoids direct bonding Fe–O. The moderate force intermediate, flattens energy diagram thereby improves performance. Therefore, this offers novel strategy tailoring performance by tuning single-atom catalyst.

Language: Английский

---