Tobias Reier

Technische Universität Berlin

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Peter Strasser

Technische Universität Berlin

Detre Teschner

Fritz Haber Institute of the Max Planck Society

Hong Nhan Nong

Technische Universität Berlin

Holger Dau

Freie Universität Berlin

Manuel Gliech

Technische Universität Berlin

Arno Bergmann

Fritz Haber Institute of the Max Planck Society

Robert Schlögl

Max Planck Institute for Chemical Energy Conversion

Ralph Kraehnert

Technische Universität Berlin

Travis E. Jones

Fritz Haber Institute of the Max Planck Society

Hyung‐Suk Oh

Sungkyunkwan University

Cooperative Institutions

Technische Universität Berlin

Max Planck Society

Fritz Haber Institute of the Max Planck Society

Freie Universität Berlin

Max-Planck-Institut für Nachhaltige Materialien

Max Planck Institute for Chemical Energy Conversion

RWTH Aachen University

Forschungszentrum Jülich

Centre National de la Recherche Scientifique

Hochschule Düsseldorf University of Applied Sciences

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Operando Studies of Hole-Doped IrNiOx core-shell electrocatalysts for Water Oxidation in acidic Environment

Proceedings of the nanoGe Fall Meeting19 (2018)

Hong Nhan Nong Tobias Reier Paul Paciok Detre Teschner Marc Heggen

10.29363/nanoge.nfm.2018.140

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Fast screening of electrocatalyst activity and stability utilizing combinatorial coupled techniques

Serhiy Cherevko Aleksandar R. Žeradjanin Tobias Reier Jan‐Philipp Grote Gareth P. Keeley

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Oxide‐Supported IrNiO_x Core–Shell Particles as Efficient, Cost‐Effective, and Stable Catalysts for Electrochemical Water Splitting

Angewandte Chemie (2015)

Hong Nhan Nong Hyung‐Suk Oh Tobias Reier Elena Willinger Marc‐Georg Willinger

Abstract Active and highly stable oxide‐supported IrNiO x core–shell catalysts for electrochemical water splitting are presented. IrNi x @IrO x nanoparticles supported on high‐surface‐area mesoporous antimony‐doped tin oxide (IrNiO x /Meso‐ATO) were synthesized from bimetallic IrNi x precursor alloys (PA‐IrNi x /Meso‐ATO) using electrochemical Ni leaching and concomitant Ir oxidation. Special emphasis was placed on Ni/NiO surface segregation under thermal treatment of the PA‐IrNi x /Meso‐ATO as well as on the surface chemical state of the particle/oxide support interface. Combining a wide array of characterization methods, we uncovered the detrimental effect of segregated NiO phases on the water splitting activity of core–shell particles. The core–shell IrNiO x /Meso‐ATO catalyst displayed high water‐splitting activity and unprecedented stability in acidic electrolyte providing substantial progress in the development of PEM electrolyzer anode catalysts with drastically reduced Ir loading and significantly enhanced durability.

Bimetallic strip

Tin oxide

Non-blocking I/O

Electrolysis of water

10.1002/ange.201411072

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Citations (46)

Tuning the Catalytic Activity and Selectivity of Cu for CO₂ Electroreduction in the Presence of Halides

ACS Catalysis (2016)

Ana Sofía Varela Wen Ju Tobias Reier Peter Strasser

In the present study we demonstrate that the activity and selectivity of copper during CO2 electrochemical reduction can be tuned by simply adding halides to the electrolyte. Comparing the production rate and Faradaic selectivity of the major products as a function the working potential in the presence of Cl–, Br–, and I–, we show that the activity and selectivity of Cu depends on the concentration and nature of the added halide. We find that the addition Cl– and Br– results in an increased CO selectivity. On the contrary, in the presence of I– the selectivity toward CO drops down and instead methane formation is enhanced up to 6 times compared with the halide-free electrolyte. Even though Br– and I– can induce morphology changes of the surface, the modification in the catalytic performance of Cu is mainly attributed to halides adsorption on the Cu surface. We hypothesizes that the adsorption of halides alters the catalytic performance of Cu by increasing the negative charge on the surface according to the following order: Cl– < Br– < I–. In the case of adsorbed I–, the induced negative charge has a remarkably positive effect favoring the protonation of CO. These results present an easy way to enhance CH4 production during the CO2RR on Cu. Furthermore, understanding this effect can contribute to the design of new and more efficient catalysts.

10.1021/acscatal.5b02550

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Citations (387)

Experimental Activity Descriptors for Iridium-Based Catalysts for the Electrochemical Oxygen Evolution Reaction (OER)

ACS Catalysis (2019)

Camillo Spöri Pascal Briois Hong Nhan Nong Tobias Reier Alain Billard

Recent progress in the activity improvement of anode catalysts for acidic electrochemical water splitting is largely achieved through empirical studies of iridium-based bimetallic oxides. Practical, experimentally accessible, yet general predictors of catalytic OER activity have remained scarce. This study investigates iridium and iridium–nickel thin film model electrocatalysts for the OER and identifies a set of general ex situ properties that allow the reliable prediction of their OER activity. Well-defined Ir-based catalysts of various chemical nature and composition were synthesized by magnetron sputtering. Correlation of physicochemical and electrocatalytic properties revealed two experimental OER activity descriptors that are able to predict trends in the OER activity of unknown Ir-based catalyst systems. More specifically, our study demonstrates that the IrIII+- and OH-surface concentration of the oxide catalyst constitute closely correlated and generally applicable OER activity predictors. On the basis of these predictors, an experimental volcano relationship of Ir-based OER electrocatalysts is presented and discussed.

Oxygen evolution

Bimetallic strip

Non-blocking I/O

10.1021/acscatal.9b00648

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Citations (171)

Stability of nanostructured iridium oxide electrocatalysts during oxygen evolution reaction in acidic environment

Electrochemistry Communications (2014)

Serhiy Cherevko Tobias Reier Aleksandar R. Žeradjanin Zarina Pawolek Peter Strasser

The electrochemical stability of thermally prepared Ir oxide films is investigated using a scanning flow cell (SFC)–inductively coupled plasma mass-spectrometer (ICP-MS) setup under transient and stationary potential and/or current conditions. Time-resolved dissolution rates provide important insights into critical conditions for material breakdown and a fully quantitative in-situ assessment of the electrochemical stability during oxygen evolution reaction (OER) conditions. In particular, the results demonstrate that stability and OER activity of the IrOx catalysts strongly depend on the chemical and structural nature of Ir oxide species and their synthesis conditions.

Oxygen evolution

10.1016/j.elecom.2014.08.027

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Iridium(1 1 1), Iridium(1 1 0), and Ruthenium(0 0 0 1) Single Crystals as Model Catalysts for the Oxygen Evolution Reaction: Insights into the Electrochemical Oxide Formation and Electrocatalytic Activity

ChemCatChem (2016)

Ebru Özer Camillo Spöri Tobias Reier Peter Strasser

Abstract We report a comparative study on the influence of generic electrochemical activation–oxidation protocols on the resulting surface oxides of Ir(1 1 1) and (1 1 0) and Ru(0 0 0 1) single crystals and their electrocatalytic reactivity for the oxygen evolution reaction. Well‐defined single‐crystal electrodes were prepared in a custom‐made chamber that combines inductive thermal annealing and electrochemistry. The clean surfaces were analyzed for their electrocatalytic oxygen evolution activities and oxidation behavior. Three different oxidation protocols were used, which revealed a strong activity dependence on the duration and upper potential limit of the electrochemical oxidation. The resulting changes of the surface were followed by using cyclic voltammetry and impedance spectroscopy. Important differences between the two faces of Ir in terms of surface morphology of the formed oxide were identified, which allowed us to draw conclusions for preferable crystal faces in nanoparticle catalysts.

Oxygen evolution

Ruthenium oxide

10.1002/cctc.201600423

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Citations (52)

Electrocatalytic Water Oxidation on Metal-Oxides: Structure Activity-Relations of Model Film Electrodes

Meeting abstracts/Meeting abstracts (Electrochemical Society. CD-ROM) (2012)

Tobias Reier Benjamin Johnson Dirk Rosenthal Robert Schloegl Peter Strasser

Abstract not Available.

10.1149/ma2012-01/40/1509

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Structure-activity-stability and in-situ Raman spectroscopic studies of oxygen evolution catalysts in acidic environment

Tobias Reier

10.14279/depositonce-5010

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Citations (2)

Mesoporous IrO₂ Films Templated by PEO-PB-PEO Block-Copolymers: Self-Assembly, Crystallization Behavior, and Electrocatalytic Performance

Chemistry of Materials (2011)

Erik Ortel Tobias Reier Peter Strasser Ralph Kraehnert

Synthesis of mesoporous iridium oxide films via soft templating and evaporation-induced self-assembly is demonstrated employing an amphiphilic triblock-copolymer PEO-PB-PEO. Films possess nanocrystalline walls and feature locally ordered pores of about 16 nm diameter. Analysis of the film properties by SEM, TEM, EDX, XPS, SAXS, XRD, and BET along the thermal treatment that succeeds dipcoating shows that the polymer template is removed by calcination between 200 and 300 °C, accompanied by uniaxial shrinkage of film and pore system perpendicular to the substrate. Treating the film in excess of 450 °C leads to further growth of crystallite size and loss of surface area progressing gradually with increasing calcination temperature. Templated IrO2 films conditioned at 450 °C show substantially reduced electrocatalytic overpotentials (efficiency increases) for the oxygen evolution reaction (OER) compared to those of untemplated coatings. Pore templating thus enables direct control over surface catalytic properties of iridium oxide.

Nanocrystalline material

Small-angle X-ray scattering

10.1021/cm200761f

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Citations (163)