Electrocatalytic oxidation of methanol on silica hollow spheres, loaded with platinum nanoparticles (Pt-SiO2-HS), is reported. The functionalized hollow silica spheres were prepared by the surfactant (lauryl ester of tyrosine) template-assisted synthesis. These spheres were loaded with platinum nanoparticles by γ-radiolysis. Energy-dispersive X-ray analysis (EDAX) and X-ray photoelectron spectroscopy (XPS) analyses confirmed presence of Si and Pt in the composite. High-resolution transmission electron microscopy showed the formation of uniformly deposited Pt nanoparticles over the hollow spheres with a predominant Pt(111) lattice plane on the surface. In spite of the poor conducting nature of the silica support, the oxidation potential and current density per unit mass for methanol oxidation were noted to be ca. 0.72 V vs NHE and 270 mA mg(-1), respectively, which are among the best values reported in its class. The composite did not show any sign of a degradation even after repeated use. In fact, the anodic current was found to increase under constant polarization, which is attributed to a facile reaction between adsorbed CO with a surface hydroxyl group present on the silica support. These results are in favor of Pt-SiO2-HS as a promising electrocatalyst material in the direct methanol fuel cell (DMFC) applications.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/am508830h | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
N,O Co-Doped Carbon Spheres Enable Stable Anode-Less Sodium Metal Batteries.
Small Methods
January 2025
Hunan Provincial Key Laboratory of Chemical Power Sources, College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, P. R. China.
Anode-less sodium metal batteries (SMBs) suffer from the formation of Na dendrites and inactive Na on an anode substrate though showing advantages of high energy densities and low costs. Herein, N,O co-doped carbon spheres (NOCS), which are synthesized via a scalable polymerization and pyrolysis method, are employed as a thin and stable sodiophillic nucleation layer on the Cu foil. Combined with electrochemical measurements, Na deposition morphology observations and density functional theory calculations, it is revealed that the introduced N and O heteroatoms can greatly enhance the adsorption of Na on the carbon substrate and reduce the nucleation overpotential, thus forming sufficient seeding sites and guiding homogeneous Na deposition.
View Article and Find Full Text PDFEnhanced effect of ferrous sulfate on nitrogen retention and PBAT degradation during co-composting by combing with biochar-loaded FN1 bacterial composites.
J Environ Manage
December 2024
Key Laboratory for Utility of Environment-Friendly Composites and Biomass in Universities of Gansu Province, Lanzhou, 730000, China; Key Laboratory of Environment-Friendly Composites of the State Ethnic Affairs Commission, Lanzhou, 730000, China. Electronic address:
The treatment of biodegradable plastics through composting has garnered increasing attention. This study aimed to investigate the effects of Biochar FN1 bacteria and ferrous sulfate on nitrogen retention, greenhouse gas emissions, and degradable plastics during composting and to elucidate their synergistic mechanisms on microbial communities. Compared with the control, applying biochar-loaded FN1 bacteria composites combined with Ferrous sulfate (SGC) markedly accelerated organic matter degradation and reduced cumulative CO and NH emissions.
View Article and Find Full Text PDFCompetitive adsorption of arsenate and phosphate on hematite facets: Molecular insights for enhanced arsenic retention.
Water Res
December 2024
State Environmental Protection Key Laboratory of Source Apportionment and Control of Aquatic Pollution & School of Environmental Studies & State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China.
Understanding the competition for adsorption between arsenate and other common oxyanions at mineral-water interfaces is critical for enhancing arsenate retention in the subsurface environment and mitigating exposure risks. This study investigated the competitive adsorption between arsenate and phosphate on hematite facets using batch experiments, together with in-situ infrared spectroscopy, two-dimensional correlation spectroscopy (2D-COS), and ab initio molecular dynamic (AIMD) simulations. This study's findings revealed that hematite exhibited notable selectivity for arsenate over phosphate in both adsorption capacity and rate, with selectivity significantly influenced by the exposed facets of the hematite and reaction concentrations.
View Article and Find Full Text PDFIn Situ Electron Tomography Insights into the Curvature Effect of a Concave Surface on Fe Single Atoms for Durable Oxygen Reaction.
Adv Sci (Weinh)
December 2024
Henan Key Laboratory of Crystalline Molecular Functional Materials, College of Chemistry and Pingyuan Laboratory, Zhengzhou University, Zhengzhou, 450001, China.
Curvature-induced interfacial electric field effects and local strain engineering offer a powerful approach for optimizing the intrinsic catalytic activity of single-atom catalysts (SACs). Investigations into the surface curvature on SACs are still ongoing, and the impact of the concave surface is often overlooked. In this work, theoretical calculations indicate that curved surfaces, particularly those with concavity, can optimize the electronic structures of single Fe sites and facilitate the reductive release of *OH.
View Article and Find Full Text PDFOrganohydrogel Based Electronic Skin Reinforced by Dual-Mode Conduction and Hierarchical Collagen Fibers Skeleton.
Adv Sci (Weinh)
December 2024
College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi'an, 710021, P. R. China.
Article Synopsis
- Collagen fiber skeleton from animal skin is an optimal base for creating electronic skin (e-skin), but challenges arise from mismatched interfaces and limited conductive networks.
- A new e-skin design incorporating dual conduction methods (using NaCl and conductive spheres) is developed, featuring a robust 3D conductive pathway and strong hydrogen bonding, resulting in high strength, conductivity, and sensing performance.
- This innovative design not only enhances sensitivity and environmental stability but also provides benefits like moisture retention and anti-freezing, positioning IECS as a versatile component for applications in wearable electronics and sensory technology.
Want 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!