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Consortium of Swiss Academic Libraries

Ion selective optodes: from the bulk to the nanoscale

Xie, Xiaojiang ; Bakker, Eric

In: Analytical and Bioanalytical Chemistry, 2015, vol. 407, no. 14, p. 3899-3910

Université de Fribourg

Tailor-made functional polymers for energy storage and environmental applications

Coskun, Ali

In: CHIMIA International Journal for Chemistry, 2020, vol. 74, no. 9, p. 667–673

CO2 emissions into the atmosphere account for the majority of environmental challenges and its global impact in the form of climate change is well-documented. Accordingly, the development of new materials approaches to capture and convert CO2 into value-added products is essential. Whereas the increased availability of renewable energy is curbing our reliance on fossil fuels and decreasing...

Université de Fribourg

Covalent triazine frameworks incorporating charged polypyrrole channels for high-performance lithium–sulfur batteries

Kim, Jiheon ; Elabd, Ahmed ; Chung, Sung-Yoon ; Coskun, Ali ; Choi, Jang Wook

In: Chemistry of Materials, 2020, vol. 32, no. 10, p. 4185–4193

Organosulfur polymers have emerged as promising electrode materials for lithium– sulfur (Li–S) batteries, mainly because of their ability to incorporate and stabilize high sulfur content. The low ionic and electronic conductivity of these polymers, however, limit their cycling performance at high active mass loadings. Moreover, Li–polysulfide (Li–PS) shuttling, a fatal phenomenon in...

Université de Fribourg

Improvement of the electrochemical performance by partial chemical substitution into the lithium site of titanium phosphate-based electrode materials for lithium-ion batteries: LiNi0.25Ti1.5 Fe0.5(PO4)3

Srout, Mohammed ; Kazzi, Mario El ; Youcef, Hicham Ben ; Fromm, Katharina M. ; Saadoune, Ismael

In: Journal of Power Sources, 2020, vol. 461, p. 228114

Partial lithium substitution with nickel (0.25 of Ni2+ ion) in the previously reported Li1.5Fe0.5Ti1.5(PO4)3/C (LFTP@C) was performed to improve its structural and electrochemical properties. The new LiNi0.25Fe0.5Ti1.5(PO4)3/C (LNFTP@C) material was then tested as electrode for lithium ion batteries. In the voltage window 1.85V–3.0 V vs. Li+/Li, attractive electrochemical performances were...

Université de Fribourg

Preparation of metallosupramolecular single-chain polymeric nanoparticles and their characterization by Taylor dispersion

Neumann, Laura N. ; Urban, Dominic A. ; Lemal, Philipp ; Ramani, Sushila ; Petri-Fink, Alke ; Balog, Sandor ; Weder, Christoph ; Schrettl, Stephen

In: Polymer Chemistry, 2020, vol. 11, no. 2, p. 586–592

Intramolecular cross-linking of polymers can furnish single-chain polymeric nanoparticles (SCPNs), and the use of reversible non-covalent bonds for cross-linking can potentially provide such nanoparticles with stimuli-responsive properties. Here, we report the synthesis of acrylic polymers that carry pendant 2,6-bis(1′-methyl- benzimidazolyl)pyridine ligands, and use these for the...

Université de Fribourg

Surface modifications of positive-electrode materials for lithium ion batteries

Kwon, Nam Hee ; Conder, Joanna ; Srout, Mohammed ; Fromm, Katharina M.

In: CHIMIA International Journal for Chemistry, 2019, vol. 73, no. 11, p. 880–893

Lithium ion batteries are typically based on one of three positive-electrode materials, namely layered oxides, olivine- and spinel-type materials. The structure of any of them is 'resistant' to electrochemical cycling, and thus, often requires modification/post- treatment to improve a certain property, for example, structural stability, ionic and/or electronic conductivity. This review...

Université de Fribourg

Functional polymers through mechanochemistry

Schrettl, Stephen ; Balkenendea, Diederik W. R. ; Calvino, Céline ; Karman, Marc ; Lavrenova, Anna ; Neumann, Laura N. ; Sagaraa, Yoshimitsu ; Verde-Sestoa, Ester ; Giannantonio, Michela di ; Simon, Yoan C. ; Fromm, Katharina M. ; Lattuada, Marco ; Weder, Christoph

In: CHIMIA International Journal for Chemistry, 2019, vol. 73, no. 1, p. 7–11

While coupling mechanical and chemical processes is widespread in living organisms, the idea to harness the mechanically induced dissociation of weak covalent and non- covalent bonds to create artificial materials that respond to mechanical stimulation has only recently gained attention. Here we summarize our activities that mainly revolve around the exploitation of non-covalent interactions...