4 research outputs found
Evaluation of triphenylene-based MOF ultrathin films for lithium batteries
Get PDFMetal–organic frameworks (MOFs) are attractive candidates to meet the requirement of next-generation batteries, as functional materials with a high surface area, well-defined metal centers, and organic linkers through coordination bonds. Due to their great tunability, MOFs have been investigated as electrodes or electrolytes in lithium batteries and more recently as protective layers in anode-less batteries. Here, we synthesize a Ni3(HHTP)2 MOF directly at the air–liquid interface of a Langmuir trough and grow the electrode on a conductive substrate by the transference process. The characterization during Langmuir film formation shows that the addition of crystallization time during the compression process enhances the formation of 2D crystalline domains, as observed by in situ grazing-incidence X-ray diffraction. Next, the transferred Ni3(HHTP)2 ultrathin films were studied as working electrodes in Li batteries in a half-cell configuration and compared with bare copper. The results show that the Ni3(HHTP)2 film protects the Cu collector from oxidation, and the negative charge accumulates in the organic ligand during the lithiation process while NiII oxidizes to NiIII, unlike other triphenylene-based MOFs with CuII or CoII metal nodes. The galvanostatic plating–stripping cycles of the batteries show that the inclusion of the crystallization time improves the coulombic efficiency, especially significantly in the first cycles when the SEI is formed. This work shows the Langmuir technique as a useful tool to test MOF based materials for batteries with the advantages of using a low amount of raw materials and without the need to introduce additives (binder and electron conductor) in the electrodes. The electrochemical study of this type of electrode allows a first screening to synthesize electrodes based on MOFs and can be a tool for the preparation of protective coatings under optimized conditions
Revitalizing the Canal de Castilla: A Community Approach to Sustainable Hydropower Assessed through Fuzzy Logic
No full textThis study addresses the sustainable revitalization of the Canal de Castilla through a community-focused approach and an assessment via fuzzy logic of the implementation of hydroelectric turbines. The canal, built in the 18th century, played a key role in transportation and territorial unification, but the deterioration of the locks has limited its functionality. This research use surveys as tools to assess the impact of the Canal de Castilla in different areas. With more than 85% of the inhabitants analyzed supporting measures in the areas of building and research at a high or very high level, and specifically proposing sustainable improvements that respect historical heritage, the installation of axial turbines in the cross channels is proposed as an efficient solution, highlighting their adaptability and low environmental impact. The careful selection of turbines, considering the historic nature of the canal, is supported with a detailed analysis using fuzzy logic. The innovation lies in the synergistic integration of community perceptions and technical analysis, providing a balanced foundation for decision making in heritage revitalization projects. This proactive approach seeks not only to identify challenges but also to formulate solutions, committing to sustainable development and active community participation
