In this paper, the natural waste pinecone as a carbon precursor for the generation of satisfactory sulfur host materials in lithium-sulfur batteries was realized by introducing molybdenum carbide nanoparticles into the derived carbon structure. The conductive pinecone-derived carbon doped with N, O reveals an expansive specific surface area, facilitating the accommodation of a higher sulfur load. Moreover, the integration of MoC nanoparticles also significantly enhances its chemical affinity and catalytic capacity for polysulfides (LiPSs) to alleviate the shuttle effect and accelerate sulfur redox conversion. As a result, the WPC-MoC/S electrode displays excellent electrochemical performance, including a low capacity decay rate of 0.074% per cycle during 600 cycles at 1 C and an outstanding rate capacity (631.2 mAh g at 3 C). Moreover, with a high sulfur loading of 5.5 mg cm, the WPC-MoC/S electrode shows a high area capacity of 5.1 mAh cm after 60 cycles at 0.2 C.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.3390/ma18051141 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Regulating the electrocatalytic active centers for accelerated proton transfer towards efficient CO reduction.
Natl Sci Rev
March 2025
National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China.
The electrochemical CO reduction reaction (CORR) is an important application that can considerably mitigate environmental and energy crises. However, the slow proton-coupled electron transfer process continues to limit overall catalytic performance. Fine-tuning the reaction microenvironment by accurately constructing the local structure of catalysts provides a novel approach to enhancing reaction kinetics.
View Article and Find Full Text PDFUnderstanding the Curvature Effect on the Structure and Bonding of MoC Nanoparticles on Carbon Supports.
ACS Appl Mater Interfaces
January 2025
Departament de Ciència de Materials i Química Física & Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona, c/Martí i Franquès 1-11, Barcelona 08028, Spain.
The interaction between molybdenum carbide (MoC) nanoparticles and both flat and curved graphene surfaces, serving as models for carbon nanotubes, was investigated by means of density functional theory. A variety of MoC nanoparticles with different sizes and stoichiometries have been used to explore different adsorption sites and modes across models with different curvature degrees. On flat graphene, off-stoichiometric MoC featuring more low-coordinated Mo atoms exhibits stronger interaction and increased electron transfers from the carbide to the carbon substrate.
View Article and Find Full Text PDFOxygen Vacancy-Mediated Synthesis of Inter-Atomically Ordered Ultrafine Pt-Alloy Nanoparticles for Enhanced Fuel Cell Performance.
J Am Chem Soc
November 2024
State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. China.
Pt-based intermetallics are expected to be the highly active catalysts for oxygen reduction reaction (ORR) in proton-exchange membrane fuel cells but still face great challenges in controllable synthesis of interatomically ordered and ultrafine intermetallic nanoparticles. Here, we propose an oxygen vacancy-mediated atomic diffusion strategy by mechanical alloying to reduce the energy barrier of the transition from interatomic disordering to ordering, and to resist interparticulate sintering via strong M-O-C bonding. This synthesis results in a nanosized core/shell structure featuring an interatomically ordered PtM core and a Pt shell of two to three atomic layers in thickness and can be extended to the multicomponent PtM (M = Co, FeCo, FeCoNi, FeCoNiGa) systems.
View Article and Find Full Text PDFElectrospun Co-MoC Nanoparticles Embedded in Carbon Nanofibers for Highly Efficient pH-Universal Hydrogen Evolution Reaction and Alkaline Overall Water Splitting.
Small Methods
October 2024
State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi, Xinjiang, 830017, P. R. China.
Article Synopsis
- Researchers developed Co-MoC nanoparticles within nitrogen-doped carbon nanofibers, showcasing a unique bamboo-like structure to tackle the challenges in efficient electrocatalysts for hydrogen evolution reactions (HER) and water splitting across different pH levels.
- The combination of ultra-small MoC particles (≈5 nm) and cobalt (Co) optimizes the catalyst's electronic structure and enhances its electrocatalytic performance, achieving low overpotentials (86, 116, and 145 mV) for significant current density in alkaline, acidic, and neutral conditions.
- The study highlights the potential of these Co-MoC/NCNFs in energy conversion applications, with a low required cell voltage of 1.59
Deciphering promotion of MoP over MoC in Pt catalysts for methanol-assisted water splitting reaction.
J Colloid Interface Sci
February 2025
School of Chemistry and Chemical Engineering, Yangzhou University, No 180, Siwangting Road, Yangzhou 225002, China. Electronic address:
Molybdenum-based compounds show promising promotion effects on Pt catalysts for energy-relevant catalysis reactions. Herein, a more effective promotion effect of MoP than MoC was found in assisting Pt nanoparticles for methanol-assisted hydrogen generation in light of the strong metal-support interaction and synergistic effect between Pt and MoP/C nanospheres. Electrochemical analyses and theoretical calculations demonstrated that Pt-MoP/C facilitated the oxidation and removal of CO intermediates more effectively than Pt-MoC/C.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!