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Université de Fribourg

Nitrogen-doped carbons with hierarchical porosity via chemical blowing towards long-lived metal-free catalysts for acetylene hydrochlorination

Kaiser, Selina K. ; Song, Kyung Seob ; Mitchell, Sharon ; Coskun, Ali ; Pérez‐Ramírez, Javier

In: ChemCatChem, 2020, p. -

Porous nitrogen‐doped carbons (NCs) are sustainable alternatives to the toxic mercury‐based acetylene hydrochlorination catalysts applied in the manufacture of polyvinyl chloride. However, the application of NCs as metal‐free catalysts is hampered by their insufficient durability under industrially relevant process conditions. In particular, pore blockage leads to accelerated...

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

Coupling of electronic and nuclear motion in a negative ion resonance: Experimental and theoretical study of benzene

Allan, Michael ; Čurík, Roman ; Čársky, Petr

In: The Journal of Chemical Physics, 2019, vol. 151, no. 6, p. 064119

We present calculated and measured elastic and vibrational excitation cross sections in benzene with the objective to assess the reliability of the theoretical method and to shed more light on how the electronic motion of the incoming electron is coupled with the nuclear motion of the vibrations. The calculation employed the discrete momentum representation method which involves solving the...

Consortium of Swiss Academic Libraries

More Than Charged Base Loss — Revisiting the Fragmentation of Highly Charged Oligonucleotides

Nyakas, Adrien ; Eberle, Rahel ; Stucki, Silvan ; Schürch, Stefan

In: Journal of The American Society for Mass Spectrometry, 2014, vol. 25, no. 7, p. 1155-1166

Université de Fribourg

Dissociative electron attachment and electronic excitation in Fe(CO)5

Allan, Michael ; Lacko, M. ; Papp, P. ; Matejčík, Š. ; Zlatar, Matija ; Fabrikant, Ilya I. ; Kočišek, J. ; Fedor, Juraj

In: Physical Chemistry Chemical Physics, 2018, vol. 20, no. 17, p. 11692–11701

In a combined experimental and theoretical study we characterize dissociative electron attachment (DEA) to, and electronically excited states of, Fe(CO)5. Both are relevant for electron-induced degradation of Fe(CO)5. The strongest DEA channel is cleavage of one metal–ligand bond that leads to production of Fe(CO)4−. High- resolution spectra of Fe(CO)4− reveal fine structures at the...

Consortium of Swiss Academic Libraries

Conformation-Specific Spectroscopy of Peptide Fragment Ions in a Low-Temperature Ion Trap

Wassermann, Tobias ; Boyarkin, Oleg ; Paizs, Béla ; Rizzo, Thomas

In: Journal of The American Society for Mass Spectrometry, 2012, vol. 23, no. 6, p. 1029-1045