Porous graphitized carbon-supported Pt for catalytic oxidation of carbon monoxide and formaldehyde under ambient conditions

Separation and Purification Technology, Journal Year: 2025, Volume and Issue: unknown, P. 131512 - 131512

Published: Jan. 1, 2025

Language: Английский

---

Sustainable Carbon‐Based Catalyst Materials Derived From Lignocellulosic Biomass for Energy Storage and Conversion: Atomic Modulation and Properties Improvement

Carbon Energy, Journal Year: 2025, Volume and Issue: unknown

Published: March 20, 2025

ABSTRACT Carbon electrocatalyst materials based on lignocellulosic biomass with multi‐components, various dimensions, high carbon content, and hierarchical morphology structures have gained great popularity in electrocatalytic applications recently. Due to the catalytic deficiency of neutral atoms, usage single lignocellulosic‐based electrocatalysis involving energy storage conversion presents unsatisfactory applicability. However, atomic‐level modulation lignocellulose‐based can optimize electronic structures, charge separation, transfer processes, so forth, which results substantially enhanced performance carbon‐based catalysts. This paper reviews recent advances rational design as electrocatalysts from an perspective, such self/external heteroatom doping metal modification. Then, through systematic discussion principles reaction mechanisms catalysts, prepared catalysts rechargeable batteries are reviewed. Finally, challenges improving prospects diverse review contributes synthesis strategy via modulation, turn promotes lignocellulose valorization for conversion.

Language: Английский

---

Low‐Temperature Pyrolysis: A Universal Route to High‐Loading Single‐Atom Catalysts for Fuel Cells

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

Published: April 3, 2025

Abstract High‐temperature pyrolysis (HTP, ≥900 °C) is a widely used method for synthesizing single‐atom catalysts (SACs). However, the high operational temperatures required HTP pose significant challenges in achieving loading, primarily due to Ostwald ripening effect. In this work, low‐temperature trans‐metalation synthesis approach developed which involves exchange of cation between transition metal ions (M = Fe, Co, Cu, Ni, Mn, etc) and Zn 2+ on nitrogen‐doped carbon (NC) matrix within molten salt medium. This strategy effectively avoids phase transformations enables direct formation mass loading (3.7–4.7 wt.%) atomically dispersed M‐N 4 sites. Both experimental theoretical analyses confirm that cation‐exchange occurs at lower temperature threshold 450 °C, significantly reducing energy barriers SACs synthesis. Furthermore, synthesized catalyst with Fe sites demonstrate excellent performance toward oxygen reduction reaction fuel cell peak power density 1.12 W cm −2 an H 2 ─O 1.0 bar 80 °C.

Language: Английский

---

Electronic Structure Modulation Induced by the Synergy of Cobalt Low-Nuclearity Clusters and Mononuclear Sites for Efficient Oxygen Electrocatalysis

ACS Nano, Journal Year: 2024, Volume and Issue: 19(1), P. 1600 - 1610

Published: Dec. 27, 2024

The development of high-performance bifunctional single-atom catalysts for use in applications, such as zinc–air batteries, is greatly impeded by mild oxygen reduction and evolution reactions (ORR OER). Herein, we report a electrocatalyst designed to overcome these limitations. catalyst consists well-dispersed low-nuclearity Co clusters adjacent single atoms over nitrogen-doped carbon matrix (CoSA+C/NC). precisely tailored asymmetric electronic structures are achieved with strong interactions between species. optimize the adsorption/desorption strength oxygenated intermediates on single-atomic sites endow exceptional activity under alkaline conditions half-wave potential (E1/2) 0.91 V an overpotential (η) 340 mV at 10 mA cm–2. In addition, battery assembled CoSA+C/NC achieves high power density 284.1 mW cm–2 long operational lifespan 400 h, superior those benchmark Pt/C + RuO2. Experimental findings theoretical analysis reveal that enhanced stems from synergistic sites. Consequently, overbinding *OH suppressed accelerated removal. This work establishes design principle advanced electrocatalysts multiphase metal species bearing interactions.

Language: Английский

---

Key strategies and challenging perspectives of carbon-based electrocatalysts for sustainable H2O2 production

Journal of Energy Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 1, 2025

Language: Английский

---

Nitrogen-doped porous carbon supported cobalt sulfide nanocomposites with high catalytic activity for peroxymonosulfate activation in dye degradation

Inorganic Chemistry Communications, Journal Year: 2025, Volume and Issue: unknown, P. 114489 - 114489

Published: April 1, 2025

Language: Английский

---

Hybrid Nanoalloy‐Cluster‐Single Atom Sites Based Aerophilic Carbon Fiber Membranes as Binder‐Free Cathodes for Ultra‐Long‐Life Zn‐air Batteries

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

Published: Oct. 18, 2024

Abstract High‐efficient and durable electrocatalysts for oxygen reduction evolution reaction (ORR/OER) are desirable to Zn‐air batteries (ZABs). However, most of catalysts in powder form with sole active sites remain challenging achieving the satisfactory bifunctional catalysis suffer from peeling off during long‐term operation. Herein, hybrid CoFe constructed containing nanoalloys (≈10 nm), clusters (< 2 single atoms on aerophilic carbon fiber membranes as binder‐free air cathodes ultra‐long‐life ZABs. In particular, high air‐permeability (0.2 s) can prevent blocking by O bubbles promote mass transfer. The theoretical experimental results confirm that hydrophilic 4 /CoFeOOH reconstructed surface mainly responsible OER. While nitrogen (N)‐doped matrix, they play a synergetic role optimizing adsorption energy enhance ORR activity. Thus, as‐prepared exhibit an ultra‐low ORR/OER potential gap (0.64 V). When further assembled freestanding air‐electrodes, it exhibits outstanding cycling lifespan 1200 155 h liquid‐ quasi‐solid‐state ZABs respectively, which fivefold twofold higher than those powder‐based (240/67 h).

Language: Английский

---

ON‐OFF switching of Photocatalytic Hydrogen Evolution by Built‐in Pt‐Nitrogen‐Carbon Reticular Heterojunctions

ChemSusChem, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 18, 2024

COF engineering with a built-in, high concentration of defined N-doped sites overcomes the "black-box" drawback conventional trial-and-error N-doping methods (used in polymeric carbon nitride and graphene), that hamper directed evolution functional interfaces based on structure-reactivity guidelines. The cutting-edge challenge is to dissect many complex interdependent functions originate from reticular N-doping, including modification material optoelectronics, band alignments, interfacial contacts co-localization active-sites, producing multiple-set effectors can all play role regulate photocatalysis. Herein, an ON-OFF gated photocatalytic H

Language: Английский

---

Recent Spectroscopy Advances in Energy Electrocatalysis

The Journal of Physical Chemistry C, Journal Year: 2024, Volume and Issue: 128(46), P. 19468 - 19481

Published: Nov. 6, 2024

Electrocatalysis plays a crucial role in energy conversion and storage, providing an effective way to achieve the goals of carbon neutrality. The combination electrochemical methods with advanced spectroscopy techniques gives insightful in-depth understanding electrocatalysis structure–performance relationship catalysts. In this review, recent advances are summarized focus on electronic structure electrocatalysts relevant dynamical reaction processes, further research challenges developments outlined for field electrocatalysis.

Language: Английский

---