Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.author | 이종목 | * |
dc.contributor.author | 이영미 | * |
dc.contributor.author | 김명화 | * |
dc.contributor.author | 김인영 | * |
dc.date.accessioned | 2023-10-19T16:31:30Z | - |
dc.date.available | 2023-10-19T16:31:30Z | - |
dc.date.issued | 2023 | * |
dc.identifier.issn | 2050-7488 | * |
dc.identifier.other | OAK-33843 | * |
dc.identifier.uri | https://dspace.ewha.ac.kr/handle/2015.oak/266384 | - |
dc.description.abstract | Understanding the relationship between crystallographic structure and electrocatalytic performance is important to successfully design an efficient electrocatalyst. With finely controlled thermal H2-reduction condition, herein, binary Pd-Cr nanofibers were fabricated as a bifunctional electrocatalyst toward both methanol oxidation reaction (MOR) and oxygen reduction reaction (ORR) for direct methanol fuel cells (DMFCs), retaining the distinct crystalline characters. The Pd-Cr nanofiber series was synthesized through the thermal reduction of single-phase PdxCr1−xOy nanofibers in the presence of a hydrogen gas flow. The resulting nanofibers exhibited different levels of crystallinity, which were significantly influenced by the reduction temperature. At a temperature of 350 °C, the Pd-Cr nanofibers were synthesized in an amorphous state, while the nanofibers reduced at temperatures above 500 °C gradually crystallized into a face-centered cubic (fcc) structure. Notably, the amorphous Pd-Cr nanofibers exhibited superior alkaline MOR performance, including high mass activity and a small Tafel slope, compared to the other crystalline counterparts in the Pd-Cr series. In situ Raman spectroscopy and CO stripping measurements further confirmed the remarkable catalytic activity and stability of the amorphous nanofibers, outperforming commercial Pd/C catalysts. Similarly, for alkaline ORR, the amorphous Pd-Cr nanofibers demonstrated superior catalytic performance, with a higher onset potential and positive half-wave potential, compared to the crystalline counterparts. Additionally, the amorphous catalyst exhibited improved resistance against agglomeration and methanol crossover issues, which are commonly observed with commercial Pt/C catalysts, serving as a benchmark for alkaline ORR. Therefore, this study highlights the facile strategy of designing optimal electrocatalysts for DMFCs by controlling the novel crystallographic structure within the binary Pd-Cr solid solution. © 2023 The Royal Society of Chemistry. | * |
dc.language | English | * |
dc.publisher | Royal Society of Chemistry | * |
dc.title | Impact of controlling the crystallinity on bifunctional electrocatalytic performances toward methanol oxidation and oxygen reduction in binary Pd-Cr solid solution | * |
dc.type | Article | * |
dc.relation.issue | 30 | * |
dc.relation.volume | 11 | * |
dc.relation.index | SCIE | * |
dc.relation.index | SCOPUS | * |
dc.relation.startpage | 16243 | * |
dc.relation.lastpage | 16254 | * |
dc.relation.journaltitle | Journal of Materials Chemistry A | * |
dc.identifier.doi | 10.1039/d3ta02782a | * |
dc.identifier.wosid | WOS:001029557200001 | * |
dc.identifier.scopusid | 2-s2.0-85166255264 | * |
dc.author.google | Jin D. | * |
dc.author.google | Lee Y. | * |
dc.author.google | Kim I.Y. | * |
dc.author.google | Lee C. | * |
dc.author.google | Kim M.H. | * |
dc.contributor.scopusid | 이종목(55812178500) | * |
dc.contributor.scopusid | 이영미(35237907700) | * |
dc.contributor.scopusid | 김명화(57191596821) | * |
dc.contributor.scopusid | 김인영(57204664442) | * |
dc.date.modifydate | 20240422130854 | * |