Dr. Ing. Ralph Krähnert - Publications

2246 Tracking Catalyst Redox States and Reaction Dynamics in Ni–Fe Oxyhydroxide Oxygen Evolution Reaction Electrocatalysts: The Role of Catalyst Support and Electrolyte pH M. Görlin, J. Ferreira de Araújo, H. Schmies, D. Bernsmeier, S. Dresp, M. Gliech, Z. Jusys, P. Chernev, R. Kraehnert, H. Dau, P. Strasser Journal of the American Chemical Society 2017, 139, 2070–2082, 10.1021/jacs.6b12250

1980 Synthesis and OER activity of NiO coatings with micelle-templated mesopore structure M. Bernicke, B. Eckhardt, A. Lippitz, E. Ortel, D. Bernsmeier, R. Schmack, R. Kraehnert ChemistrySelect ChemistrySelect 2016, 1, 482–489, 10.1002/slct.201600110

1978 Oxygen Evolution Reaction Dynamics, Faradaic Charge Efficiency, and the Active Metal Redox States of Ni–Fe Oxide Water Splitting Electrocatalysts M. Görlin, P. Chernev, J. Ferreira de Araújo, T. Reier, S. Dresp, B. Paul, R. Krähnert, H. Dau, P. Strasser Journal of the American Chemical Society 2016, 138, 5603–5614, 10.1021/jacs.6b00332

1977 Missing Piece of the Mechanism of the Turkevich Method: The Critical Role of Citrate Protonation F. Kettemann, A. Birnbaum, S. Witte, M. Wuithschick, N. Pinna, R. Kraehnert, K. Rademann, J. Polte Chemistry of Materials 2016, 28, 4072–4081, 10.1021/acs.chemmater.6b01796

1976 Highly Active Binder-Free Catalytic Coatings for Heterogeneous Catalysis and Electrocatalysis: Pd on Mesoporous Carbon and Its Application in Butadiene Hydrogenation and Hydrogen Evolution D. Bernsmeier, L. Chuenchom, B. Paul, S. Rümmler, B. Smarsly, R. Kraehnert ACS Catalysis 2016, 6, 8255–8263, 10.1021/acscatal.6b02240

1975 New Approach on Quantification of Porosity of Thin Films via Electron-Excited X-ray Spectra E. Ortel, A. Hertwig, D. Berger, P. Esposito, A. M. Rossi, R. Kraehnert, V. D. Hodoroaba Analytical Chemistry 2016, 88, 7083–7090, 10.1021/acs.analchem.6b00847

1974 Nafion-Free Carbon-Supported Electrocatalysts with Superior Hydrogen Evolution Reaction Performance by Soft Templating D. Bernsmeier, M. Bernicke, E. Ortel, A. Bergmann, A. Lippitz, J. Nissen, R. Schmack, P. Strasser, J. Polte, R. Kraehnert ChemElectroChem ChemElectroChem 2017, 4, 221–229, 10.1002/celc.201600444

1854 Hydrothermal synthesis of bi-functional nanostructured manganese tungstate catalysts for selective oxidation X. Li, T. Lunkenbein, J. Kröhnert, V. Pfeifer, F. Girgsdies, F. Rosowski, R. Schlögl, A. Trunschke Faraday Discussions Faraday Discuss. 2016, 188, 99–113, 10.1039/C5FD00191A

1853 Enhancing of catalytic properties of vanadia via surface doping with phosphorus using atomic layer deposition V. E. Strempel, D. Löffler, J. Kröhnert, K. Skorupska, B. Johnson, R. N. d'Alnoncourt, M. Driess, F. Rosowski Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films 2016, 34, 1– 10.1116/1.4936390

1805 ZnO Coatings with Controlled Pore Size, Crystallinity and Electrical Conductivity R. SCHMACK, B. ECKHARDT, G. KOCH, E. ORTEL, R. KRAEHNERT Materials Science Materials Science 2016, 22, 10.5755/j01.ms.22.1.8634

1804 Iridium Oxide Coatings with Templated Porosity as Highly Active Oxygen Evolution Catalysts: Structure-Activity Relationships M. Bernicke, E. Ortel, T. Reier, A. Bergmann, J. Ferreira de Araujo, P. Strasser, R. Kraehnert ChemSusChem 2015, 8, 1908–1915, 10.1002/cssc.201402988

1803 Time-resolved studies on the formation mechanism of iron oxide nanoparticles using combined fast-XANES and SAXS A. Kabelitz, A. Guilherme, M. Joester, U. Reinholz, M. Radtke, R. Bienert, K. Schulz, R. Schmack, R. Kraehnert, F. Emmerling CrystEngComm CrystEngComm 2015, 17, 8463–8470, 10.1039/C5CE01585E

1802 Electrospun Carbon Nanofibers as Alternative Electrode Materials for Vanadium Redox Flow Batteries A. Fetyan, I. Derr, M. K. Kayarkatte, J. Langner, D. Bernsmeier, R. Kraehnert, C. Roth ChemElectroChem ChemElectroChem 2015, 2, 2055–2060, 10.1002/celc.201500284

1801 Water-assisted nitrogen mediated crystallisation of ZnO films R. Muydinov, A. Steigert, S. Schönau, F. Ruske, R. Kraehnert, B. Eckhardt, I. Lauermann, B. Szyszka Thin Solid Films Thin Solid Films 2015, 590, 177–183, 10.1016/j.tsf.2015.07.034

1800 Turkevich in New Robes: Key Questions Answered for the Most Common Gold Nanoparticle Synthesis M. Wuithschick, A. Birnbaum, S. Witte, M. Sztucki, U. Vainio, N. Pinna, K. Rademann, F. Emmerling, R. Kraehnert, J. Polte ACS Nano 2015, 9, 7052–7071, 10.1021/acsnano.5b01579

1799 Propanol formation from CO2 and C2H4 with H2 over Au/TiO2: Effect of support and K doping S. J. Ahlers, R. Kraehnert, C. Kreyenschulte, M. M. Pohl, D. Linke, E. V. Kondratenko Catalysis Today 2015, 258, 684–690, 10.1016/j.cattod.2015.04.006

1717 Hydrophobic Nanoreactor Soft-Templating: A Supramolecular Approach to Yolk@Shell Materials A. Guiet, C. Göbel, K. Klingan, M. Lublow, T. Reier, U. Vainio, R. Kraehnert, H. Schlaad, P. Strasser, I. Zaharieva, H. Dau, M. Driess, J. Polte, A. Fischer Advanced Functional Materials 2015, 25, 6228–6240, 10.1002/adfm.201502388

1632 Reliable palladium nanoparticle syntheses in aqueous solution: the importance of understanding precursor chemistry and growth mechanism F. Kettemann, M. Wuithschick, G. Caputo, R. Kraehnert, N. Pinna, K. Rademann, J. Polte CrystEngComm CrystEngComm 2015, 17, 1865–1870, 10.1039/C4CE01025F

1631 Pd/TiO2 coatings with template-controlled mesopore structure as highly active hydrogenation catalyst E. Ortel, J. Polte, D. Bernsmeier, B. Eckhardt, B. Paul, A. Bergmann, P. Strasser, F. Emmerling, R. Kraehnert Applied Catalysis A: General 2015, 493, 25–32, 10.1016/j.apcata.2014.12.044

1630 Enhanced photocatalytic performance in atomic layer deposition grown TiO thin films via hydrogen plasma treatment A. Sasinska, T. Singh, S. Wang, S. Mathur, R. Kraehnert Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films 2015, 33, 1– 10.1116/1.4904503

1629 Antireflective Coatings with Adjustable Refractive Index and Porosity Synthesized by Micelle-Templated Deposition of MgF Sol Particles D. Bernsmeier, J. Polte, E. Ortel, T. Krahl, E. Kemnitz, R. Kraehnert ACS Applied Materials & Interfaces ACS Applied Materials & Interfaces 2014, 6, 19559–19565, 10.1021/am5052685

1628 Electrochemically dealloyed platinum with hierarchical pore structure as highly active catalytic coating R. Kraehnert, E. Ortel, B. Paul, B. Eckhardt, M. Kanis, R. Liu, A. Antoniou Catalysis Science & Technology 2015, 5, 206–216, 10.1039/C4CY00851K

1627 Versatile control over size and spacing of small mesopores in metal oxide films and catalytic coatings via templating with hyperbranched core–multishell polymers D. Bernsmeier, E. Ortel, J. Polte, B. Eckhardt, S. Nowag, R. Haag, R. Kraehnert J. Mater. Chem. A J. Mater. Chem. A 2014, 2, 13075–13082, 10.1039/C4TA01842G

1626 Mechanical behavior of mesoporous titania thin films T. Rahman, R. Liu, E. Ortel, R. Kraehnert, A. Antoniou Applied Physics Letters 2014, 104, 241902– 10.1063/1.4883260

1625 Electrocatalytic Oxygen Evolution on Iridium Oxide: Uncovering Catalyst-Substrate Interactions and Active Iridium Oxide Species T. Reier, D. Teschner, T. Lunkenbein, A. Bergmann, S. Selve, R. Kraehnert, R. Schlögl, P. Strasser Journal of The Electrochemical Society 2014, 161, 10.1149/2.0411409jes

1624 Direct synthesis of nanosized-ZSM-5/SBA-15 analog composites from preformed ZSM-5 precursors for improved catalytic performance as cracking catalyst X. H. Vu, U. Bentrup, M. Hunger, R. Kraehnert, U. Armbruster, A. Martin Journal of Materials Science Journal of Materials Science 2014, 49, 5676–5689, 10.1007/s10853-014-8287-z

1623 Prototyping of catalyst pore-systems by a combined synthetic, analytical and computational approach: Application to mesoporous TiO2 V. Novák, E. Ortel, B. Winter, B. Butz, B. Paul, P. Kočí, M. Marek, E. Spiecker, R. Kraehnert Chemical Engineering Journal 2014, 248, 49–62, 10.1016/j.cej.2014.02.004

1380 Dimensionally Stable Ru/Ir/TiO -Anodes with Tailored Mesoporosity for Efficient Electrochemical Chlorine Evolution N. Menzel, E. Ortel, K. Mette, R. Kraehnert, P. Strasser ACS Catalysis 2013, 3, 1324–1333, 10.1021/cs4000238

1379 Micelle-Templated Oxides and Carbonates of Zinc, Cobalt, and Aluminum and a Generalized Strategy for Their Synthesis B. Eckhardt, E. Ortel, D. Bernsmeier, J. Polte, P. Strasser, U. Vainio, F. Emmerling, R. Kraehnert Chemistry of Materials 2013, 25, 2749–2758, 10.1021/cm400535d

1378 Size-Controlled Synthesis of Colloidal Silver Nanoparticles Based on Mechanistic Understanding M. Wuithschick, B. Paul, R. Bienert, A. Sarfraz, U. Vainio, M. Sztucki, R. Kraehnert, P. Strasser, K. Rademann, F. Emmerling, J. Polte Chemistry of Materials 2013, 25, 4679–4689, 10.1021/cm401851g

1377 Electrocatalytic Oxygen Evolution Reaction on Iridium Oxide Model Film Catalysts: Influence of Oxide Type and Catalyst Substrate Interactions T. Reier, I. Weidinger, P. Hildebrandt, R. Kraehnert, P. Strasser ECS Transactions ECS Transactions 2013, 58, 39–51, 10.1149/05802.0039ecst

899 New Triblock Copolymer Templates, PEO-PB-PEO, for the Synthesis of Titania Films with Controlled Mesopore Size, Wall Thickness, and Bimodal Porosity E. Ortel, A. Fischer, L. Chuenchom, J. Polte, F. Emmerling, B. Smarsly, R. Kraehnert Small Small 2012, 8, 298–309, 10.1002/smll.201101520

898 Electrocatalysis Using Porous Nanostructured Materials N. Menzel, E. Ortel, R. Kraehnert, P. Strasser ChemPhysChem 2012, 13, 1385–1394, 10.1002/cphc.201100984

897 Micelle-Templated Mesoporous Films of Magnesium Carbonate and Magnesium Oxide B. Eckhardt, E. Ortel, J. Polte, D. Bernsmeier, O. Görke, P. Strasser, R. Kraehnert Advanced Materials 2012, 24, 3115–3119, 10.1002/adma.201104984

896 Recent progress in soft-templating of porous carbon materials L. Chuenchom, R. Kraehnert, B. M. Smarsly Soft Matter 2012, 8, 10801– 10.1039/C2SM07448F

895 Supported Mesoporous and Hierarchical Porous Pd/TiO Catalytic Coatings with Controlled Particle Size and Pore Structure E. Ortel, S. Sokolov, C. Zielke, I. Lauermann, S. Selve, K. Weh, B. Paul, J. Polte, R. Kraehnert Chemistry of Materials 2012, 24, 3828–3838, 10.1021/cm301081w

677 Mesoporous IrO Films Templated by PEO-PB-PEO Block-Copolymers: Self-Assembly, Crystallization Behavior, and Electrocatalytic Performance E. Ortel, T. Reier, P. Strasser, R. Kraehnert Chemistry of Materials 2011, 23, 3201–3209, 10.1021/cm200761f

655 Mesoporous Ferromagnetic MPt@Silica/Carbon (M = Fe, Co, Ni) Composites As Advanced Bifunctional Catalysts E. Kockrick, F. Schmidt, K. Gedrich, M. Rose, T. A. George, T. Freudenberg, R. Kraehnert, R. Skomski, D. J. Sellmyer, S. Kaskel Chemistry of Materials 2010, 22, 1624–1632, 10.1021/cm9016276

654 Mechanism of Gold Nanoparticle Formation in the Classical Citrate Synthesis Method Derived from Coupled In Situ XANES and SAXS Evaluation J. Polte, T. T. Ahner, F. Delissen, S. Sokolov, F. Emmerling, A. F. Thünemann, R. Kraehnert Journal of the American Chemical Society 2010, 132, 1296–1301, 10.1021/ja906506j

653 Nucleation and Growth of Gold Nanoparticles Studied Small Angle X-ray Scattering at Millisecond Time Resolution J. Polte, R. Erler, A. F. Thünemann, S. Sokolov, T. T. Ahner, K. Rademann, F. Emmerling, R. Kraehnert ACS Nano ACS Nano 2010, 4, 1076–1082, 10.1021/nn901499c

652 Influence of steel substrate roughness on morphology and mesostructure of TiO2 porous layers produced by template-assisted dip coating E. Ortel, S. Sokolov, R. Kraehnert Microporous and Mesoporous Materials Microporous and Mesoporous Materials 2010, 127, 17–24, 10.1016/j.micromeso.2009.06.024

651 New insights of the nucleation and growth process of gold nanoparticles via in situ coupling of SAXS and XANES J. Polte, R. Kraehnert, M. Radtke, U. Reinholz, H. Riesemeier, A. F. Thünemann, F. Emmerling Journal of Physics: Conference Series Journal of Physics: Conference Series 2010, 247, 12051– 10.1088/1742-6596/247/1/012051

650 Mechanistic insights into seeded growth processes of gold nanoparticles J. Polte, M. Herder, R. Erler, S. Rolf, A. Fischer, C. Würth, A. F. Thünemann, R. Kraehnert, F. Emmerling Nanoscale ACS Nano 2010, 2, 2463– 10.1039/c0nr00541j

649 SAXS in combination with a free liquid jet for improved time-resolved in situ studies of the nucleation and growth of nanoparticles J. Polte, R. Erler, A. F. Thünemann, F. Emmerling, R. Kraehnert Chemical Communications Chemical Communications 2010, 46, 9209– 10.1039/C0CC03238G

648 Template-Assisted Electrostatic Spray Deposition as a New Route to Mesoporous, Macroporous, and Hierarchically Porous Oxide Films S. Sokolov, B. Paul, E. Ortel, A. Fischer, R. Kraehnert Langmuir Langmuir 2011, 27, 1972–1977, 10.1021/la104272h

647 Broad-Spectrum Enhancement of Polymer Composite Dielectric Constant at Ultralow Volume Fractions of Silica-Supported Copper Nanoparticles G. Kofod, S. Risse, H. Stoyanov, D. N. McCarthy, S. Sokolov, R. Kraehnert ACS Nano ACS Nano 2011, 5, 1623–1629, 10.1021/nn103097q

646 Correction to Broad-Spectrum Enhancement of Polymer Composite Dielectric Constant at Ultralow Volume Fractions of Silica-Supported Copper Nanoparticles G. Kofod, S. Risse, H. Stoyanov, D. N. McCarthy, S. Sokolov, R. Kraehnert ACS Nano ACS Nano 2011, 5, 2412–2413, 10.1021/nn200675s