Pyrolytic Transformation of Zn-TAL Metal–Organic Framework into Hollow Zn–N–C Spheres for Improved Oxygen Reduction Reaction Catalysis DOI Creative Commons

Gulnara Yusibova,

John C. Douglin, Iuliia Vetik

et al.

ACS Omega, Journal Year: 2025, Volume and Issue: 10(15), P. 15280 - 15291

Published: April 12, 2025

Metal-organic frameworks (MOFs) are promising precursors for creating metal-nitrogen-carbon (M-N-C) electrocatalysts with high performance, though maintaining their structure during pyrolysis is challenging. This study examines the transformation of a Zn-based MOF into an M-N-C electrocatalyst, focusing on preservation carbon framework and prevention Zn aggregation pyrolysis. A highly porous Zn-N-C electrocatalyst derived from Zn-TAL (where TAL stands TalTech-UniTartu Alliance Laboratory) was synthesized via optimized pyrolysis, yielding notable electrocatalytic activity toward oxygen reduction reaction (ORR). Scanning electron microscopy (SEM) X-ray diffraction spectroscopy (XRD) analyses confirmed that preserved its integrity remained free metal aggregates, even at elevated temperatures. Rotating disc electrode (RDE) tests in alkaline solution showed demonstrated ORR par commercial Pt/C electrocatalysts. In anion-exchange membrane fuel cell (AEMFC), material pyrolyzed 1000 °C exhibited peak power density 553 mW cm-2 60 °C. work demonstrates excellent precursor forming hollow structures, making it high-performance Pt-free cells.

Language: Английский

Producing Pd single site on cerium oxides using ball milling process to accelerate catalytic VOCs removal efficiency: experimental and DFT + U study DOI
Yifan Zhang, Jun Liu, Yuan Liu

et al.

Journal of Thermal Analysis and Calorimetry, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 23, 2025

Language: Английский

Citations

1
Breaking symmetry for better catalysis: insights into single-atom catalyst design DOI
Peng Cao,

Xueqin Mu,

Fanjiao Chen

et al.

Chemical Society Reviews, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

This review examines the strategies of symmetry breaking (charge/coordination/geometric) in single-atom catalysts to regulate active site electronic structures, greatly enhancing catalytic performance.

Language: Английский

Citations

1
Single-Atom Catalysts Toward Electrochemical Water Treatment DOI
Xiuwu Zhang, Shuaishuai Li, Guohua Zhao

et al.

Applied Catalysis B Environment and Energy, Journal Year: 2024, Volume and Issue: 363, P. 124783 - 124783

Published: Nov. 5, 2024

Language: Английский

Citations

7
Laser driven generation of single atom Fe-N-C catalysts for the oxygen reduction reaction DOI Creative Commons

Ainhoa Madrid,

A. Tolosana-Moranchel, Álvaro García

et al.

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 498, P. 155363 - 155363

Published: Aug. 31, 2024

Single-Atom Catalysts (SACs) have emerged as the ultimate solutions in challenging systems bridging gap between homogeneous and heterogeneous catalysts.However, feasible synthesis methods are necessary to stabilize single metal atoms, increase catalyst loadings scale up synthesis.Due its sluggish kinetics, oxygen reduction reaction (ORR) is main source of irreversibility proton exchange membrane fuel cells (PEMFC).The most promising candidates replace Pt-based catalysts for ORR so-called Fe-N/C catalysts.These display high activity acidic alkaline electrolytes.In this work, we propose a laser-driven pyrolysis approach generate SACs that involves decomposition aerosolized iron-phthalocyanines.The resulting displays electrolytes, with competitive half-potential kinetic current density values comparison state-of-the-art electrocatalysts.

Language: Английский

Citations

4
Single Atom Cocatalysts in Photocatalysis DOI Creative Commons

Si‐Ming Wu,

Patrik Schmuki

Advanced Materials, Journal Year: 2024, Volume and Issue: 37(7)

Published: Dec. 29, 2024

Abstract Single‐atom (SA) cocatalysts (SACs) have garnered significant attention in photocatalysis due to their unique electronic properties and high atom utilization efficiency. This review provides an overview of the concept principles SA cocatalyst photocatalysis, emphasizing intrinsic differences SAs used classic chemical catalysis. Key factors that influence efficiency photocatalytic reactions, particularly hydrogen (H 2 ) production, are highlighted. further covers synthesis methods, stabilization strategies, characterization techniques for common photocatalysis. Notably, “reactive deposition” method, which often shows a self‐homing effect thus achieves maximum cocatalysts, is emphasized. Furthermore, applications various processes, including H evolution, carbon dioxide reduction, nitrogen fixation, organic synthesis, comprehensively reviewed, along with insights into artifacts these applications. concludes by addressing challenges faced SACs offering perspectives on future developments, aim informing advancing research energy conversion.

Language: Английский

Citations

4
Nitrogen Defects and Interfacial Chemical Bonds in Fe Single‐Site Mediated C3N4 With Rod‐Like Fe2O3 Enhanced the S‐Scheme Heterojunction for Efficient Energy Conversion DOI Open Access
Xinglin Wang, Huihui Zhang,

Yamei Huang

et al.

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

Published: Jan. 16, 2025

Abstract The rational design of S‐scheme heterojunctions holds significant potential for efficient photocatalytic energy conversion, attributed to their enhanced carrier separation efficiency and high redox capacity. Nevertheless, achieving precise control transfer dynamics in remains a substantial challenge. Herein, unique architecture is devised featuring porous rod‐shaped Fe 2 O 3 particles loaded onto single‐sites modified g‐C N 4 nanosheets via mediated heterocomponent anchorage, the directed growth using as anchoring points, thereby forming O─Fe─N interfacial chemical bonds (ICBs) generating abundant nitrogen defects (FeO/FeCN‐N v ). Photophysical processes are further investigated femtosecond transient absorption spectroscopy (fs‐TAS) situ irradiated X‐ray photoelectron (ISI‐XPS) with an adjustable wavelength irradiation light source. Encouragingly, results reveal internal electric field (IEF) constructed at these semicoherent phase boundaries, creating asymmetrical charge distribution. Simultaneously, introduce additional defect level that accelerates electron through IEF, enabling more rapid migration surface‐active sites both styrene epoxidation hydrogen evolution. synergistic effect ICBs coupling regulating offers new insights into photocatalysis, paving way advancements conversion.

Language: Английский

Citations

0
Structure-activity relationships in the development of single atom catalyst for sustainable organic transformations DOI Creative Commons

Deepshikha Roy,

Kalyanjyoti Deori

Nanoscale Advances, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Exploration of single atom catalysts for unmatched efficiency and selectivity in organic transformations through morphological control metal–support interactions.

Language: Английский

Citations

0
Transition metal single-atom catalysts for water splitting: Unravelling coordination strategies and catalytic mechanisms for sustainable hydrogen generation DOI Creative Commons
Yongqiang Zhu, Jiaqi Su,

Jiwen Liao

et al.

Next Materials, Journal Year: 2025, Volume and Issue: 6, P. 100491 - 100491

Published: Jan. 1, 2025

Language: Английский

Citations

0
Exploring the mechanisms associated with electrocatalytic reactions for oxygen and hydrogen evolution DOI

Ajitha Pandian,

Laila Rameesha,

Chitra Boobalan

et al.

Deleted Journal, Journal Year: 2025, Volume and Issue: unknown, P. 100046 - 100046

Published: Jan. 1, 2025

Language: Английский

Citations

0
Synergy of Pyridinic‐N and Co Single Atom Sites for Enhanced Oxygen Redox Reactions in High‐Performance Zinc‐Air Batteries DOI Creative Commons
Saeed Askari, Swarit Dwivedi, Masood S. Alivand

et al.

Small, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 29, 2025

Abstract Cobalt single‐atom catalysts (SACs) have the potential to act as bi‐functional electrocatalysts for oxygen‐redox reactions in metal‐air batteries. However, achieving both high performance and stability these SACs has been challenging. Here, a novel facile synthesis method is used create cobalt‐doped‐nitrogen‐carbon structures (Co‐N‐C) containing cobalt‐SACs by carbonizing modified ZIF‐11. HAADF‐STEM images EXAFS spectra confirmed that structure with lowest cobalt concentration contains single atoms coordinated four nitrogen (Co‐N₄). Electrochemical tests showed this electrocatalyst performed exceptionally well oxygen reduction reaction (ORR) (E1/2 ≈ 0.859 V) evolution (OER) (Ej = 10: 1.544 V), excellent stability. When air cathode of rechargeable zinc‐air battery (ZAB), peak power density 178.6.1 mW cm −2 , specific capacity 799 mA h g Zn −1 cycle‐life 1580 achieved. Density functional theory (DFT) calculations revealed position pyridinic Co play critical role determining overpotential reactions. The unprecedented can bring paradigm changes practical realization application

Language: Английский

Citations

0