Enhanced electrocatalytic performance of CoS2/C composites for water oxidation

International Journal of Hydrogen Energy, Год журнала: 2025, Номер 113, С. 170 - 179

Опубликована: Март 1, 2025

Язык: Английский

---

Synergistic Modulation of Multisite Electronic States via Erbium Doping and NiCoP Hybridization for Enhanced Anion Exchange Membrane Water Splitting

Nano Letters, Год журнала: 2025, Номер unknown

Опубликована: Март 6, 2025

Water dissociation in anion exchange membrane water electrolysis (AEMWE) faces significant energy barriers, posing a challenge for reducing cell voltage. Herein, we engineered CoP nanosheets by doping Er and hybridizing with NiCoP to optimize local electronic states accelerate H2O during the hydrogen evolution reaction. The resulting Er0.1-CoP/NiCoP catalyst achieves low overpotential of 154 mV at -500 mA cm-2 1.0 M KOH. An AEM electrolyzer comprising an Er0.1-CoP/NiCoP@NF cathode demonstrates voltage 1.672 V stability exceeding 1000 h 500 (50 °C). Characterization, density functional theory (DFT) calculations, ab initio molecular dynamics (AIMD) simulations reveal that hybridization synergistically modulate charge distribution across multisites, shifting p-band centers away from Fermi level. These adjustments free H* adsorption (ΔGH*) improve OH*/H2O* adsorption, thereby facilitating H2 evolution.

Язык: Английский

---

Electrochemical N–N Oxidatively Coupled Dehydrogenation of 3,5-Diamino-1H-1,2,4-triazole for Value-Added Chemicals and Bipolar Hydrogen Production

Journal of the American Chemical Society, Год журнала: 2025, Номер unknown

Опубликована: Март 8, 2025

Electrochemical H2 production from water favors low-voltage molecular oxidation to replace the oxygen evolution reaction as an energy-saving and value-added approach. However, there exists a mismatch between high demand for slow anodic reactions, restricting practical applications of such hybrid systems. Here, we propose bipolar approach, with generation N–N oxidatively coupled dehydrogenation (OCD) 3,5-diamino-1H-1,2,4-triazole (DAT), in addition cathodic generation. The system requires relatively low potentials 0.872 1.108 V vs RHE reach 10 500 mA cm–2, respectively. H-type electrolyzer only 0.946 1.129 deliver 100 respectively, electricity consumption (1.3 kWh per m3 H2) reduced by 68%, compared conventional splitting. Moreover, process is highly appealing due absence traditional hazardous synthetic conditions azo compounds at anode crossover/mixing H2/O2 electrolyzer. A flow-type operates stably cm–2 300 h. Mechanistic studies reveal that Pt single atom nanoparticle (Pt1,n) optimize adsorption S active sites over Pt1,n@VS2 catalysts. At anode, stepwise −NH2 DAT then oxidative coupling −N–N– predominantly form while generating H2. present report paves new way atom-economical aminotriazole green electrosynthesis chemicals.

Язык: Английский

---

Flexible Electrocatalyst Engineering Based on 2D Ultrathin Nanosheets and Lamellar Fern‐Like Aerogel for Water Electrolysis

Advanced Sustainable Systems, Год журнала: 2025, Номер unknown

Опубликована: Март 12, 2025

Abstract Water electrolysis represents the primary method to produce green hydrogen. Nevertheless, during water electrolysis, particularly at high current densities, a large number of gas bubbles generated are difficult detach from electrode, triggering series negative effects such as active site covering, ionic conductance block, and catalyst deactivation, which in turn reduces efficiency. In recent years, flexible electrocatalysts have been developed address this issue well, with superior characteristics including mechanical deformability, optimization, mass transfer efficiency, structural stability. The advanced development electrocatalyst engineering for is urgently needed be systematically reviewed. Here, first, summarized deeply understand their impact on performance. Second, strategies design based 2D nanosheets fern‐like structure comprehensively introduced. Last but not least, outlooks research presented, will provide preliminary theoretical basis new ideas low‐cost, high‐performance, long‐life applied electrolysis.

Язык: Английский

---

Advanced development of finite element analysis for electrochemical catalytic reactions

Chemical Communications, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

The development of robust simulation techniques is crucial for elucidating electrochemical catalytic mechanisms and can even provide guidance the tailored design regulation highly efficient catalysts.

Язык: Английский

---

Regulating Interfacial H₂O Activity and H₂ Bubbles by Core/Shell Nanoarrays for 800 h Stable Alkaline Seawater Electrolysis

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Март 24, 2025

Abstract The catalytic activity and stability under high current densities for hydrogen evolution reactions (HER) are impeded by firm adherence coverage of H 2 bubbles to the sites. Herein, we systematically synthesize core/shell nanoarrays engineer bubble transport channels, which further remarkably regulate interfacial O activity, swift generation release. self‐supported catalyst holds uniform ultra‐low Ru active sites 0.38 wt% promotes rapid formation plentiful small bubbles, rapidly released upright mitigating blockage avoiding surface damage from movements. As a result, these achieve ultralow overpotentials 18 24 mV reach 10 mA cm −2 HER in 1 M KOH freshwater seawater, respectively. Additionally, assembled electrolyzer demonstrates stable durability over 800 hours with density A seawater. techno‐economic analysis (TEA) indicates that unit cost production system is nearly half DOE's (Department Energy) 2026 target. Our work addresses challenges highlights its potential as sustainable economically feasible solution large‐scale

Язык: Английский

---

Enhanced Tri‐Atom Ru‐Based Catalyst for Hydrogen Evolution Reaction via Rapid Pyrolysis of Precursor

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Март 27, 2025

Abstract Atomically precise supported nanocluster catalysts (APSNCs), with well‐defined metal active sites, unique geometrical and electronic structures metal–metal bonds, demonstrate excellent catalytic performance. However, the synthesis of APSNCs centers stable remains a huge challenge due to uncontrollable aggregation during reactions. Herein, Ru 3 uniformly dispersed on oxidized carbon nanotubes (Ru /OCNT) is successfully synthesized by using rapid pyrolysis precursor strategy. The obtained /OCNT exhibits performance for alkaline hydrogen evolution reaction (HER). catalyst achieves an overpotential 19 mV at current density 10 mA cm −2 in 1 m KOH solution, outperforming commercial 20 wt.% Pt/C 5 Ru/C. Moreover, mass activity 23.47 11.83 times higher than that Density functional theory (DFT) calculations reveal interaction metal–support effectively modulate structure atoms, lower adsorption energy site, promote H* desorption. This work offers new perspective design

Язык: Английский

---

A comparative study of oxygen and hydrogen evolution reactions in alkaline, acidic and neutral media using SnS2/C catalyst

Carbon letters, Год журнала: 2025, Номер unknown

Опубликована: Март 29, 2025

Язык: Английский

---

Exploring hydrogen fuel as a sustainable solution for zero-emission aviation: Production, storage, and engine adaptation challenges

International Journal of Hydrogen Energy, Год журнала: 2025, Номер 121, С. 304 - 325

Опубликована: Апрель 1, 2025

Язык: Английский

---

Emerging Issues and Opportunities of 2D Layered Transition Metal Dichalcogenide Architectures for Supercapacitors

ACS Nano, Год журнала: 2025, Номер unknown

Опубликована: Апрель 2, 2025

Two-dimensional layered transition metal dichalcogenides (2D TMDs) have emerged as promising candidates for supercapacitor (SCs) owing to their tunable electronic properties, structures, and effective ion intercalation capabilities. Despite these advantages, challenges such low electrical conductivity, the interlayer restacking, oxidation structural collapse hinder practical implementation. This review provides a comprehensive overview of recent advances in development 2D TMDs SCs. We begin by outlining charge storage mechanisms design principles SCs, followed an in-depth discussion synthesis methods associated fabricating TMD architectures. The subsequent sections explore crystal structures reaction mechanisms, illustrating electrochemical potential Furthermore, we highlight material modification strategies, including nanostructuring, defect engineering, phase control, surface/interface modulation, which been proposed overcome existing challenges. Finally, address critical issues emerging opportunities inspire SC technologies.

Язык: Английский

---