Academic Journal
Microwave-assisted synthesis of iron sulfide motifs for electrochemical applications
| Title: | Microwave-assisted synthesis of iron sulfide motifs for electrochemical applications |
|---|---|
| Authors: | Kenna L Salvatore, Christopher R Tang, Edelmy Marin Bernardez, Weiqiao Wesley, Justin Fang, Katherine Lee, Ariadna Paltis, Chloe Nevers, Scott C McGuire, Nathaniel Hurley, Xiao Tong, Esther S Takeuchi, Kenneth J Takeuchi, Amy C Marschilok, Stanislaus S Wong |
| Source: | JPhys Materials, Vol 6, Iss 2, p 024005 (2023) |
| Publisher Information: | IOP Publishing, 2023. |
| Publication Year: | 2023 |
| Collection: | LCC:Materials of engineering and construction. Mechanics of materials LCC:Physics |
| Subject Terms: | microwave synthesis, reaction mechanism, carbon nanotube, metal sulfide, electrochemistry, Materials of engineering and construction. Mechanics of materials, TA401-492, Physics, QC1-999 |
| More Details: | The syntheses of FeS _2 and Fe _3 S _4 nanomaterials were optimized using a novel facile, surfactant-free, and microwave-assisted, one-pot synthesis method, run under ambient and reasonably mild reaction conditions. Synthetic parameters, such as metal precursor salt identity, reaction time, reaction temperature, metal:sulfur molar ratios, and solvent combinations, were all systematically investigated and optimized. A series of FeS _2 (pyrite) samples was initially fabricated using thioacetamide (TAA) as the sulfur precursor to generate a distinctive, uniform octahedra-based morphology. Switching the sulfur precursor from TAA to L-cysteine resulted in a corresponding transformation in not only chemical composition from FeS _2 to an iron thiospinel structure, Fe _3 S _4 (otherwise known as greigite), but also an associated morphological evolution from octahedra to nanosheet aggregates. The study of these materials has enabled crucial insights into the formation mechanisms of these materials under a relatively non-conventional microwave-assisted setting. Furthermore, in separate experiments, multi-walled carbon nanotubes (MWNTs) and graphene were added in with underlying metal sulfide species to create conductive Fe–S/MWNT composites and Fe–S/graphene composites, respectively. The method of addition of either MWNTs or graphene was also explored, wherein an ‘ ex-situ ’ synthetic procedure was found to be the least disruptive means of attachment and immobilization onto iron sulfide co-reagents as a means of preserving the latter’s inherent composition and morphology. The redox acidity for the parent material and associated composites demonstrates the utility of our as-developed synthetic methods for creating motifs relevant for electrochemical applications, such as energy storage. |
| Document Type: | article |
| File Description: | electronic resource |
| Language: | English |
| ISSN: | 2515-7639 |
| Relation: | https://doaj.org/toc/2515-7639 |
| DOI: | 10.1088/2515-7639/accc56 |
| Access URL: | https://doaj.org/article/32b3286cb756482da7fc7cc772df905c |
| Accession Number: | edsdoj.32b3286cb756482da7fc7cc772df905c |
| Database: | Directory of Open Access Journals |
| ISSN: | 25157639 |
|---|---|
| DOI: | 10.1088/2515-7639/accc56 |
| Published in: | JPhys Materials |
| Language: | English |