Recent Advances on Carbon‐Based Metal‐Free Electrocatalysts for Energy and Chemical Conversions

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

Published: July 25, 2024

Over the last decade, carbon-based metal-free electrocatalysts (C-MFECs) have become important in electrocatalysis. This field is started thanks to initial discovery that nitrogen atom doped carbon can function as a electrode alkaline fuel cells. A wide variety of nanomaterials, including 0D dots, 1D nanotubes, 2D graphene, and 3D porous carbons, has demonstrated high electrocatalytic performance across applications. These include clean energy generation storage, green chemistry, environmental remediation. The applicability C-MFECs facilitated by effective synthetic approaches, e.g., heteroatom doping, physical/chemical modification. methods enable creation catalysts with properties useful for sustainable transformation storage (e.g., cells, Zn-air batteries, Li-O

Language: Английский

---

Creating High‐entropy Single Atoms on Transition Disulfides through Substrate‐induced Redox Dynamics for Efficient Electrocatalytic Hydrogen Evolution

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(32)

Published: May 16, 2024

The controllable anchoring of multiple metal single-atoms (SAs) into a single support exhibits scientific and technological opportunities, while marrying the concentration-complex multimetallic SAs high-entropy (HESAs) one SAC system remains substantial challenge. Here, we present substrate-mediated formation strategy to successfully fabricate library HESAs on MoS

Language: Английский

---

Carbon dots bridged Zn0.5Cd0.5S with interfacial amide bond facilitating electron transfer for efficient photocatalytic hydrogen peroxide production

Applied Catalysis B Environment and Energy, Journal Year: 2024, Volume and Issue: 346, P. 123721 - 123721

Published: Jan. 10, 2024

Language: Английский

---

Accelerated O2 adsorption and stabilized *OOH for electrocatalytic H2O2 production

Journal of Material Science and Technology, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Language: Английский

---

Targeting Synthesis of Diatomic Catalysts by Selective Etching and Sequential Adsorption of Metal Atom

Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 8, 2025

Diatomic catalysts featuring a tunable structure and synergetic effects hold great promise for various reactions. However, their precise construction with specific configurations diverse metal combinations is still challenging. Here, selective etching ion adsorption strategy proposed to accurately assign second atom (M2) geminal the single site (M1–Nx) constructing diatomic sites (e.g., Fe–Pd, Fe–Pt, Fe–Ru, Fe–Zn, Co–Fe, Co–Ni, Co–Cu). In this strategy, hydrogen peroxide selectively etches positively charged carbon atoms near M1–Nx moiety (denoted as α-C) produces vacancy, which could trap M2 at subsequent step. These show optimized electronic enhanced oxygen reduction activity compared single-site counterparts, representative Fe–Pd–NC Co–Fe–NC stand most active reaction (half-wave potential of 0.92 0.91 V, respectively). The α-C in single-atom reported here represents new post-treatment targeting synthesis sites.

Language: Английский

---

Molecular Engineering of a Metal‐Organic Polymer for Enhanced Electrochemical Nitrate‐to‐Ammonia Conversion and Zinc Nitrate Batteries

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(48)

Published: Oct. 13, 2023

Metal-organic framework-based materials are promising single-site catalysts for electrocatalytic nitrate (NO3- ) reduction to value-added ammonia (NH3 on account of well-defined structures and functional tunability but still lack a molecular-level understanding designing the high-efficient catalysts. Here, we proposed molecular engineering strategy enhance electrochemical NO3- -to-NH3 conversion by introducing carbonyl groups into 1,2,4,5-tetraaminobenzene (BTA) based metal-organic polymer precisely modulate electronic state metal centers. Due electron-withdrawing properties group, centers can be converted an electron-deficient state, fascinating adsorption promoting continuous hydrogenation reactions produce NH3 . Compared CuBTA with low efficiency 85.1 %, quinone group functionalization endows resulting copper tetraminobenzoquinone (CuTABQ) distinguished performance much higher FE 97.7 %. This is also universal, as verified improved different centers, including Co Ni. Furthermore, assembled rechargeable Zn-NO3- battery CuTABQ cathode deliver high power density 12.3 mW cm-2 work provides advanced insights rational design complex through regulation electroreduction

Language: Английский

---

Electrocatalytic degradation of p-nitrophenol on metal-free cathode: Superoxide radical (O2•−) production via molecular oxygen activation

Journal of Hazardous Materials, Journal Year: 2023, Volume and Issue: 462, P. 132797 - 132797

Published: Oct. 17, 2023

Language: Английский

---

Carboxylated Hexagonal Boron Nitride/Graphene Configuration for Electrosynthesis of High‐Concentration Neutral Hydrogen Peroxide

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 63(7)

Published: Dec. 30, 2023

Abstract The electrosynthesis of hydrogen peroxide (H 2 O ) via two‐electron (2 e − oxygen (O reduction reaction (ORR) has great potential to replace the traditional energy‐intensive anthraquinone process, but design low‐cost and highly active selective catalysts is greatly challenging for long‐term H production under industrial relevant current density, especially neutral electrolytes. To address this issue, work constructed a carboxylated hexagonal boron nitride/graphene ( h ‐BN/G) heterojunction on commercial activated carbon through coupling B, N co‐doping with surface groups functionalization. champion catalyst exhibited high ORR selectivity (>95 %), rate (up 13.4 mol g −1 ), Faradaic efficiency (FE, >95 %). density 100 mA cm −2 caused cumulative concentration as 2.1 wt %. combination in situ Raman spectra theoretical calculation indicated that h‐ BN/G configuration promotes adsorption stabilization key intermediates, allowing low energy barrier rate‐determining step HOOH* release from site thus improving performance. fast dye degradation by using electrochemical synthesized further illustrated promising practical application.

Language: Английский

---

Bifunctional Edge‐Rich Nitrogen Doped Porous Carbon for Activating Oxygen and Sulfur

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(11)

Published: Jan. 1, 2023

Abstract Oxygen reduction reaction (ORR) and sulfur (SRR) play key roles in advanced batteries. However, they both suffer from sluggish kinetics. Here, an interesting nitrogen doped porous carbon material that can simultaneously activate oxygen is reported. The precursor a containing covalent organic framework (COF), constituting periodically stacked 2D sheets. COF structure well preserved upon pyrolysis, resulting the formation of edge‐rich with resembling holey graphene. groups are decomposed into graphitic pyridinic during pyrolysis. These edge sites uniform doping endow product high intrinsic catalytic activities toward ORR SRR. derived delivers outstanding performances when assembling as cathodes Li‐S Li‐O 2 Simultaneous activation also enables new battery chemistry. A proof‐of‐concept Li‐S/O hybrid assembled, delivering large specific capacity 2,013 mAh g −1 . This study may inspire novel designs based on

Language: Английский

---

NiFe Nanoparticle-Encapsulated Ultrahigh-Oxygen-Doped Carbon Layers as Bifunctional Electrocatalysts for Rechargeable Zn–Air Batteries

Inorganic Chemistry, Journal Year: 2023, Volume and Issue: 62(28), P. 11199 - 11206

Published: July 4, 2023

There is an urgent demand for developing highly efficient bifunctional electrocatalysts with excellent stability toward the oxygen evolution and reduction reactions (OER ORR, respectively) rechargeable Zn-air batteries (ZABs). In this work, NiFe nanoparticles encapsulated within ultrahigh-oxygen-doped carbon quantum dots (C-NiFe) as are successfully obtained. The accumulation of layers formed by results in abundant pore structures a large specific surface area, which favorable improving catalytic active site exposure, ensuring high electronic conductivity simultaneously. synergistic effect enriched number centers naturally increased inherent electrocatalytic performance. Benefiting from above optimization, C-NiFe shows electrochemical activity both OER ORR processes (the overpotential only 291 mV to achieve 10 mA cm-2). Furthermore, C-FeNi catalyst air cathode displays impressive peak power density 110 mW cm-2, open-circuit voltage 1.47 V, long-term durability over 58 h. preparation electrocatalyst provides design idea construction bimetallic composites high-performance batteries.

Language: Английский

---