of 241 K.
To continue this theoretical study, we performed an experimental synthesis of Th-H phases at high-pressures including ThH10. Obteined results can be found in Ref. [10].
Acknowledgement.This work was supported by RFBR foundation № 19-03-00100 and facie foundation, grant UMNIK № 13408GU/2018.
References:
[1] D. Duan et al., Sci. Rep. 4, 6968 (2018)
[2] A.P. Drozdov et al. Nature. 525, 73–76 (2015)
[3] A.G. Kvashnin at al. J. Phys. Chem. C, 122 4731–4736 (2018)
[4] A.G. Kvashnin et al. ACS Applied Materials & Interfaces 10, 43809-43816 (2018)
[5] I.A. Kruglov et al. Sci. Adv. 4, eaat9776. (2018)
[6] D.V. Semenok et al. J. Phys. Chem. Lett. 8, 1920–1926 (2018)
[7] A.O. Lyakhov et al. Comp. Phys. Comm. 184, 1172–1182 (2013)
[8] A.R. Oganov et al. J. Chem. Phys. 124, 244704 (2006)
[9] A.R. Oganov et al. Acc. Chem. Res. 44 227–237 (2011)
[10] D.V. Semenok et al. Mat. Today., 33, 36–44 (2020)
Enhanced Electrocatalytic Activities by Substitutional Tuning of Nickel-based Ruddlesden-Popper Catalysts for the Oxidation of Urea and Small Alcohols
Stevenson, K. J.1
1 – Skolkovo Institute of Science and Technology, Moscow, Russia
The electrooxidation of urea continues to attract considerable interest as an alternative to the oxygen evolution reaction (OER) as the anodic reaction in the electrochemical generation of hydrogen due to the lower potential required to drive the reaction and the abundance of urea available in waste streams. In this talk the effect of Sr substitution in a series of La2-xSrxNiO4+δRuddlesden-Popper catalysts on the electrooxidations of urea, methanol, and ethanol are presented. We demonstrate that activities toward the urea oxidation reaction increase with increasing Ni oxidation state. The 75 % Sr-substituted La0.5Sr1.5NiO4+δ catalyst exhibits a mass activity of 588 mA
References:
[1] Forslund, R. P.; Alexander, C. T.; Abakumov, A. M.; Johnston, K. P.; Stevenson, K. J. “Enhanced Electrocatalytic Activities of Nickel-based Ruddlesden-Popper Catalysts for the Oxidation of Urea and Small Alcohols By Active Site Variation,” ACS Catal. 2019,9(3), 2664–2673.
[2] Forslund, R. P.; Hardin, W. G.; Rong, X; Abakumov, A. M.; Filimonov, D.; Alexander, C. T.; Mefford, J. T.; Iyer, H.; Kolpak, A. M.; Johnston, K. P; Stevenson, K. J. “Exceptional Electrocatalytic Oxygen Evolution Via Tunable Charge Transfer Interactions in La0.5Sr1.5Ni1-xFexO4+δ Ruddlesden-Popper Oxides,” Nature Comm. 2018,9(1)3150.
Professor Stevenson is Full Professor and Provost at the Skolkovo Institute for Science and Technology in Moscow, Russia. His interests are aimed at elucidating and controlling chemistry at interfaces vital to many energy storage and energy conversion technologies. He has published over 280 papers, six patents, and six book chapters. He is the founding director of Skoltech’s Center for Energy Science and Technology. In 2019, Skoltech became the youngest university in the world and only university in the Russian Federation to be ranked in top 100 Nature Index of Top Young Universities.
Electrochemical synthesis of copolymers containing porphyrine derivatives and their activity towards CO2
Sachin Kochrekar,1,2 Ajit Kalekar,2 Shweta Mehta,3,4 Pia Damlin,2 Mikko Salomäki,2 Sari Granroth,5 Niko Meltola,6 Kavita Joshi,3,4Carita Kvarnström2
1Turku University Graduate School (UTUGS) Doctoral Programme in Physical and Chemical Sciences, FI-20014 Turku, Finland
2Turku University Centre for Materials and Surfaces (MatSurf), Department of Chemistry, University of Turku, Vatselankatu 2, FI-20014 Turku, Finland.
3Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune 411008 India.
4Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-200112, UP, India.
5Laboratory of Materials Science, University of Turku, FI-20014, Turku, Finland.
6ArcDia International Oy Ltd, Lemminkäisenkatu 32, FI-20521-Turku, Finland.
This study reports the electropolymerization of novel keto functionalized octaethyl metal porphyrins (Zn+2 and Ni+2) in presence of 4,4 bipyridine (4,4´ BPy) as bridging nucleophile on FTO surface. The polymer films were characterized by electrochemical, spectroscopic (UV–Vis, XPS, FT-IR and Raman spectroscopy) and microscopic (AFM and SEM) techniques. The absorption and electronic spectra establish the binding of monomer units in the polymer film, retaining most of the spectroscopic properties of the monomer with slight shift and peak broadening. The surface morphology reveals heterogeneous polymerization. Through computational studies, we aim to get insight into the effect of metal center (Zn+2 and Ni+2) and presence of the keto group on the porphyrin unit. The first 4,4´ BPy prefers meso position next to β-keto group in ZnOEPK whereas it prefers opposite meso position in NiOEPK further leading to linear and branched orientation with the introduction of second 4,4´ BPy, respectively. The interaction between the polymer films in the absence and presence of CO2 suggests a similar mechanism for both the polymers. The role of the 4,4´ BPy in the polymer unit in association with the activity with CO2 is emphasized.
Acknowledgement. The authors acknowledge the Magnus Ehrnrooth foundation and Business Finland for financial support.
Carita Kvarnström
Professor of Materials Chemistry
Department of Chemistry
University of Turku
Finland
1996 PhD, Åbo Akademi University, Åbo-Turku Finland
1996–2008 Assistant and Associate Professor, Åbo Akademi University, Åbo-Turku Finland
2009- Full Professor in Materials Chemistry University of Turku, Finland
2010–2014 Director for Turku University Centre for Materials and Surfaces
2017–2016 Head of Laboratory of Materials and Chemical Analysis
2017–2019 Head of Department
Honors or Awards
1996