First virtual Bilateral Conference on Functional Materials (BiC-FM)

Honors or Awards

1996 The Alftan prize for meritorious thesis published awarded by The Finnish Chemists Society

1996 The Elvings prize for the best thesis published at the Åbo Akademi University

1997 Representative for Finland at Scientia Europea 2. Organized by Académie des Sciences (French Academy of Sciences) France.

2006 The Pehr Brahe prize for meritorious research work awarded by the Foundation of Åbo Akademi University.

2020 Member of Finnish Academy of Science and Letters

Research Interests

Conjugated polymers, composite materials, graphene and graphene oxide, ionic liquids, CO

conversion, in situ spectroelectrochemistry, electrochemistry

Publications; 137 peer reviewed international scientific journals, 3 patent applications

Positronium emission from materials for Li-ion batteries

Bernardo Barbiellini

Jan Kuriplach

School of Engineering Science, LUT university, Lappeenranta 53851, Finland

Department of Physics, Northeastern University, Boston, Massachusetts 02115, USA

Department of Low Temperature Physics, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, CZ-180 00 Prague, Czech Republic

bernardo.barbiellini@lut.fi

A positron and an electron annihilate into gamma-ray photons but before this annihilation, the positron and an electron can bind together to form a positronium (Ps). Mono-energetic positron beams can be used to bombard materials and to probe their atomistic properties. In particular, the implanted positron can diffuse back to the surface of a solid and be emitted as Ps with a range of kinetic energies that provides key information regarding the energy levels of the electrons in the material. These energies can be measured by time of flight (TOF) experiments, but the Ps lifetime before annihilation has been too short for precise measurements. Recently, Jones et al. [1], by exciting the emitted Ps with a laser to greatly increase its lifetime, obtained TOF measurements with an ultimate precision of the order of 5 meV that will allow materials simulations in systems pertinent for Li-ion batteries cathodes [2,3].

References:

[1] A. C. L. Jones, H. J. Rutbeck-Goldman, T. H. Hisakado, A. M. Piñeiro, H. W. K. Tom, A. P. Mills, Jr. B. Barbiellini, J. Kuriplach, Phys. Rev. Lett. 117, 216402 (2016)

[2] B. Barbiellini, J. Kuriplach, Journal of Physics: Conf. Series 791, 012016 (2017)

[3] J. Kuriplach, A. Pulkkinen, B. Barbiellini, Condensed Matter 4, 80 (2019)

The role of nitrogen and oxygen in the formation capacity of carbon materials

Evlashin S.A.

, Fedorov F.S.

, Dyakonov P.V.

, Maksimov Yu.M.

, Pilevsky A.A.

, Maslakov K.I.

, Akhatov I.Sh.

1 – Skolkovo Institute of Science and Technology, Moscow, Russia

2 – Lomonosov Moscow State University, Moscow, Russia

s.evlashin@skoltech.ru

Carbon materials are attracting increasing attention as a material for supercapcitor fabrication due to availability and high specific surface area. However, the initial capacitance of raw carbon is quite low, so the N and O heteroatoms are introduced in order to increase their specific capacitance. Despite the vast amount of studies on carbon materials, a lot of grey areas in mechanisms that lead to the increase in the specific capacitance remain. We demonstrate an effective method for modification of the surface of Carbon NanoWalls (CNWs) using DC plasma in atmospheres of O

, N

, and their mixture. Processing in the plasma leads to the incorporation of ∼4 atom % nitrogen and ∼10 atom % oxygen atoms. Electrochemical measurements reveal that CNWs functionalized with oxygen groups are characterized by higher capacitance. The specific capacitance for samples with oxygen reaches 8.9 F cm

at a scan rate of 20 mV s

. In contrast, the nitrogen-doped samples demonstrate a specific capacitance of 4.4 F cm

at the same scan rate. The mechanism of heteroatom incorporation into the carbon lattice is explained using density functional theory calculations.

Acknowledgement.This work was supported by the Russian Science Foundation, grant 17-19-01787.

References:

[1] S.A. Evlashin, F.S. Fedorov, P.V. Dyakonov, Y.M. Maksimov, A.A. Pilevsky, K.I. Maslakov, Y.O. Kuzminova, Y.A. Mankelevich, E.N. Voronina, S.A. Dagesyan, V.A. Pletneva, A.A. Pavlov, M.A. Tarkhov, I.V. Trofimov, V.L. Zhdanov, N.V. Suetin, I.S. Akhatov, I. S., Role of Nitrogen and Oxygen in Capacitance Formation of Carbon Nanowalls. The Journal of Physical Chemistry Letters, 11(12), (2020).

Nickel-Nitrogen active sites towards selective High-rate CO

-to-formate electroreduction

Cristina Flox

, Fatemeh Davodi

, Davide Pavesi

and Tanja Kallio

1 – Department of Chemistry and Materials Science, School of Chemical Engineering, Aalto University, FI-00076, Espoo, Finland

2 – Avantium Chemicals BV, Zekeringstraat 29 1014 BV Amsterdam, The Netherlands