Susanne Kuhri

Forschungszentrum Jülich

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Dirk M. Guldi

Friedrich-Alexander-Universität Erlangen-Nürnberg

Athanassios G. Coutsolelos

University of Crete

Theodore Lazarides

Aristotle University of Thessaloniki

Georgios Charalambidis

University of Crete

Werner Lehnert

Forschungszentrum Jülich

Carsten Korte

Forschungszentrum Jülich

Klaus Wippermann

Forschungszentrum Jülich

Bu‐Sung Lee

Nanyang Technological University

Christoph Schierl

Friedrich-Alexander-Universität Erlangen-Nürnberg

Yusuke Mitsushige

The University of Tokyo

Cooperative Institutions

Friedrich-Alexander-Universität Erlangen-Nürnberg

Forschungszentrum Jülich

Friedrich Schiller University Jena

University of Crete

Schiller International University

Centre National de la Recherche Scientifique

National Hellenic Research Foundation

Leibniz Institute of Photonic Technology

Universidad Autónoma de Madrid

Helmholtz Institute Jena

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Polymer electrolyte membrane water electrolysis: Restraining degradation in the presence of fluctuating power

Journal of Power Sources (2016)

Christoph Rakousky Uwe Reimer Klaus Wippermann Susanne Kuhri Marcelo Carmo

Degradation

Electrolysis of water

10.1016/j.jpowsour.2016.11.118

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Citations (197)

Interaction of PBI-Type Polymers with New Acidic Proton Conducting Ionic Liquids - Conductivity and ORR Kinetics

Carsten Korte Susanne Kuhri Werner Lehnert Klaus Wippermann Jürgen Giffin

Source

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The influence of water content in a proton-conducting ionic liquid on the double layer properties of the Pt/PIL interface

Physical Chemistry Chemical Physics (2017)

Klaus Wippermann Jürgen Giffin Susanne Kuhri Werner Lehnert Carsten Korte

The influence of the water content of 2-sulfoethylmethylammonium trifluoromethanesulfonate [2-Sema][TfO] on the double layer properties of the interface of platinum and the proton conducting ionic liquid (PIL) is investigated by means of impedance spectroscopy and cyclic voltammetry. By fitting the impedance spectra as complex capacitances, up to four differential double layer capacitances and corresponding time constants are obtained, depending on the potential (U = 0-1.6 V/RHE), water content (0.7-6.1 wt%) and temperature (T = 70-110 °C). Within the whole potential range investigated, a high frequency capacitance, C1, and a low frequency capacitance, C2, can be calculated. In the potential region of hydrogen underpotential deposition (HUPD), C1 can be separated into two parts, C1a and C1b. Whereas the high frequency capacitive processes can mainly be attributed to ion transport processes in the double layer, the low frequency process is ascribed to changes in the interfacial layer, including ad-/desorption and Faradaic processes. Alternative interpretations regarding the reorientation of ions, reconstruction of the metal surface and partial electron transfer between anions and Pt are considered.

Double-layer capacitance

Differential capacitance

Double layer (biology)

10.1039/c7cp04003b

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Citations (27)

CCDC 883015: Experimental Crystal Structure Determination

The Cambridge Structural Database (2012)

Theodore Lazarides Susanne Kuhri Georgios Charalambidis Manoj Kumar Panda Dirk M. Guldi

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.5517/ccymvcr

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Local Evaluation of Processed Membrane Electrode Assemblies by Scanning Electrochemical Microscopy

Journal of The Electrochemical Society (2017)

Wiebke Schulte Shuai Liu Inka Plettenberg Susanne Kuhri Wiebke Lüke

Gas diffusion electrodes (GDEs) for high-temperature polymer electrolyte fuel cells with different sizes of the used binder particles were evaluated by scanning electrochemical microscopy (SECM) with shear force (SF) supplement. The SF data provide means of checking the substrate morphology with respect to cracks formed during the drying process and with respect to aggregates from used binder of poly(fluoroethylene) (PTFE) simultaneously to the electrochemical data. Electron microscopy results show that a GDE prepared with smaller PTFE particles exhibits less PTFE aggregation and more regular cracks. The SECM images show a more homogeneous distribution and higher level of oxygen reduction reaction activity for the GDE prepared with smaller PTFE particles. The quantitative comparison is enabled by the SF setup that maintains a constant working distance toward the sample in the variant of the redox competition mode, in which a cyclic voltammogram was recorded for every grid position of the microelectrode probe. Mass transport limitations of oxygen during the experiment are avoided by dedicated shape of the microelectrode body. Images of microelectrode currents at specific potentials were extracted to map the local electrocatalytic activity of the GDE. The GDEs were processed to membrane electrode assemblies and applied in HT-PEFC single cell tests. The polarization curve agree with the SECM results that GDEs produced with smaller PTFE particles favor the MEA performance.

Scanning Electrochemical Microscopy

10.1149/2.0061709jes

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Citations (7)

CCDC 883014: Experimental Crystal Structure Determination

The Cambridge Structural Database (2012)

Theodore Lazarides Susanne Kuhri Georgios Charalambidis Manoj Kumar Panda Dirk M. Guldi

10.5517/ccymvbq

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Photoinduced electron transfer in a meso-linked Zn(II)porphyrin-Zn(II)phthalocyanine/C₆₀-pyridyl supramolecular system

Journal of Porphyrins and Phthalocyanines (2013)

Maxence Urbani Samira Osati Susanne Kuhri Dirk M. Guldi Tomás Torres⊗

A non-covalent supramolecular complex combining porphyrin (Por), phthalocyanine (Pc) and fullerene [ C 60 ], was obtained through zinc metal-pyridine coordination between a covalently meso-linked heterodimer ZnPor-ZnPc (4) and a N-pyridylfulleropyrrolidine derivative (5). The complexation was studied in toluene by absorption and fluorescence binding studies, and evidenced that the coordination of the N-pyridylfulleropyrrolidine (5) occurs preferentially through the zinc ion center of ZnPc (log K > 6.0) rather than ZnPor (log K = 5.23). Steady-state and time-resolved spectroscopies evidenced that upon selective excitation of either the Por, or the Pc moiety in [( ZnPor-ZnPc )∪ C 60 ], the singlet excited state of Pc was generated efficiently in both cases (either from singlet-singlet energy transfer from 1 Por* to Pc, or directly after selective excitation of the Pc moiety). Next, an electron transfer occurred from the 1 Pc* to the C 60 to generate the charge-separated specie [( ZnPor-ZnPc •+ )∪ C 60 •- ]. Finally, the back electron transfer afforded the Pc triplet excited state rather than the ground state. The introduction of a covalent meso-linkage between Por and Pc in the heterodimer 4 and in the supramolecular assembly 4∪5 induces appreciable differences toward the photo-induced processes and the binding constants in comparison with other β-covalently linked analogue systems.

Font

Photoinduced electron transfer

Intersystem crossing

10.1142/s1088424613500302

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Citations (5)

CCDC 883013: Experimental Crystal Structure Determination

The Cambridge Structural Database (2012)

Theodore Lazarides Susanne Kuhri Georgios Charalambidis Manoj Kumar Panda Dirk M. Guldi

10.5517/ccymv9p

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CCDC 1452866: Experimental Crystal Structure Determination

The Cambridge Structural Database (2016)

Dieter Sorsche Markus Schaub Frank W. Heinemann Johannes Habermehl Susanne Kuhri

10.5517/ccdc.csd.cc1krtns

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En route towards panchromatic light harvesting: photophysical and electrochemical properties of Bodipy–porphyrazine conjugates

Chemical Science (2014)

Susanne Kuhri Verena Engelhardt Rüdiger Faust Dirk M. Guldi

The concept of panchromatic light harvesting, that is, broad absorption cross sections throughout most of the visible range and excited state funnelling, has been realized in a novel set of porphyrazines. On one hand, zinc, copper, or magnesium ions were complexed by porphyrazines to tune their ground and excited state features. On the other hand, up to eight Bodipys were covalently attached to the periphery of the porphyrazines to enhance the ground state absorption. The corresponding star-shaped conjugates were probed by advanced photophysical measurements, that is, time-resolved fluorescence and femtosecond transient absorption spectroscopy. From the latter we derive spectroscopic and kinetic evidence in support of a fast and unidirectional energy transfer from the photoexcited Bodipy at the periphery to the porphyrazine at the core. In addition, the impact of the different metal centers is demonstrated.

Porphyrazine

BODIPY

Panchromatic film

10.1039/c4sc00326h

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Citations (19)