All Outputs (37)

Elucidating the mechanism of the CO2 methanation reaction over Ni–Fe hydrotalcite-derived catalysts via surface-sensitive in situ XPS and NEXAFS (2020)
Journal Article
Giorgianni, G., Mebrahtu, C., Schuster, M., Large, A., Held, G., Ferrer, P., …Arrigo, R. (2020). Elucidating the mechanism of the CO2 methanation reaction over Ni–Fe hydrotalcite-derived catalysts via surface-sensitive in situ XPS and NEXAFS. Physical Chemistry Chemical Physics, 22(34), 18788-18797. https://doi.org/10.1039/d0cp00622j

Hydrotalcite-derived Ni and Fe-promoted hydrotalcite-derived Ni catalysts were found to outperform industrial catalysts in the CO2 methanation reaction, however the origin of the improved activity and selectivity of these catalysts is not clear. Here... Read More about Elucidating the mechanism of the CO2 methanation reaction over Ni–Fe hydrotalcite-derived catalysts via surface-sensitive in situ XPS and NEXAFS.

Influence of synthesis conditions on the structure of nickel nanoparticles and their reactivity in selective asymmetric hydrogenation (2019)
Journal Article
Arrigo, R., Gallarati, S., Schuster, M., Seymour, J., Gianolio, D., da Silva, I., …Held, G. (2020). Influence of synthesis conditions on the structure of nickel nanoparticles and their reactivity in selective asymmetric hydrogenation. ChemCatChem, 12(5), 1491-1503. https://doi.org/10.1002/cctc.201901955

Unsupported and SiO2-supported Ni nanoparticles (NPs), were synthesised via hot-injection colloidal route using oleylamine (OAm) and trioctylphosphine (TOP) as reducing and protective agents, respectively. By adopting a multi-length scale structural... Read More about Influence of synthesis conditions on the structure of nickel nanoparticles and their reactivity in selective asymmetric hydrogenation.

On the high structural heterogeneity of Fe impregnated graphite-carbon catalysts from Fe nitrate precursor (2019)
Journal Article
Arrigo, R., & Schuster, M. (2019). On the high structural heterogeneity of Fe impregnated graphite-carbon catalysts from Fe nitrate precursor. Catalysts, 9(4), 303. https://doi.org/10.3390/catal9040303

Wet impregnation is broadly applied for the synthesis of carbon supported metal/metal oxide nanostructures because of its high flexibility, simplicity and low cost. By contrast, impregnated catalysts are typified by a usually undesired nanostructural... Read More about On the high structural heterogeneity of Fe impregnated graphite-carbon catalysts from Fe nitrate precursor.

The role of the copper oxidation state in the electrocatalytic reduction of CO2 into valuable hydrocarbons (2018)
Journal Article
Velasco-Vélez, J., Jones, T., Gao, D., Carbonio, E., Arrigo, R., Hsu, C., …Chuang, C. (2018). The role of the copper oxidation state in the electrocatalytic reduction of CO2 into valuable hydrocarbons. ACS sustainable chemistry & engineering, 7(1), 1485-1492. https://doi.org/10.1021/acssuschemeng.8b05106

Redox-active copper catalysts with accurately prepared oxidation states (Cu0, Cu+ and Cu2+) and high selectivity to C2 hydrocarbon formation, from electrocatalytic cathodic reduction of CO2, were fabricated and characterized. The electrochemically pr... Read More about The role of the copper oxidation state in the electrocatalytic reduction of CO2 into valuable hydrocarbons.

Electrochemically active Ir NPs on graphene for OER in acidic aqueous electrolyte investigated by in situ and ex situ spectroscopies (2018)
Journal Article
Velasco-Vélez, J., Jones, T., Streibel, V., Hävecker, M., Chuang, C., Frevel, L., …Knop-Gericke, A. (2018). Electrochemically active Ir NPs on graphene for OER in acidic aqueous electrolyte investigated by in situ and ex situ spectroscopies. Surface Science, 681(Mar 19), 1-8. https://doi.org/10.1016/j.susc.2018.10.021

An electrode for the oxygen evolution reaction based on a conductive bi-layered free standing graphene support functionalized with iridium nanoparticles was fabricated and characterized by means of potentiometric and advanced X-ray spectroscopic tech... Read More about Electrochemically active Ir NPs on graphene for OER in acidic aqueous electrolyte investigated by in situ and ex situ spectroscopies.

In situ electrochemical cells to study the oxygen evolution reaction by near ambient pressure x-ray photoelectron spectroscopy (2018)
Journal Article
Streibel, V., Hävecker, M., Yi, Y., Velasco Vélez, J., Skorupska, K., Stotz, E., …Arrigo, R. (2018). In situ electrochemical cells to study the oxygen evolution reaction by near ambient pressure x-ray photoelectron spectroscopy. Topics in Catalysis, 61(20), 2064-2084. https://doi.org/10.1007/s11244-018-1061-8

In this contribution, we report the development of in situ electrochemical cells based on proton exchange membranes suitable for studying interfacial structural dynamics of energy materials under operation by near ambient pressure X-ray photoelectron... Read More about In situ electrochemical cells to study the oxygen evolution reaction by near ambient pressure x-ray photoelectron spectroscopy.

Operando spectroscopy study of the carbon dioxide electro-reduction by iron species on nitrogen-doped carbon (2018)
Journal Article
Genovese, C., Schuster, M., Gibson, E., Gianolio, D., Posligua, V., Grau-Crespo, R., …Arrigo, R. (2018). Operando spectroscopy study of the carbon dioxide electro-reduction by iron species on nitrogen-doped carbon. Nature communications, 9, 935. https://doi.org/10.1038/s41467-018-03138-7

The carbon–carbon coupling via electrochemical reduction of carbon dioxide represents the biggest challenge for using this route as platform for chemicals synthesis. Here we show that nanostructured iron (III) oxyhydroxide on nitrogen-doped carbon en... Read More about Operando spectroscopy study of the carbon dioxide electro-reduction by iron species on nitrogen-doped carbon.

In situ observation of reactive oxygen species forming on oxygen-evolving iridium surfaces (2016)
Journal Article
Pfeifer, V., Jones, T., Velasco Vélez, J., Arrigo, R., Piccinin, S., Hävecker, M., …Schlögl, R. (2017). In situ observation of reactive oxygen species forming on oxygen-evolving iridium surfaces. Chemical Science, 8(3), 2143-2149. https://doi.org/10.1039/c6sc04622c

Water splitting performed in acidic media relies on the exceptional performance of iridium-based materials to catalyze the oxygen evolution reaction (OER). In the present work, we use in situ X-ray photoemission and absorption spectroscopy to resolve... Read More about In situ observation of reactive oxygen species forming on oxygen-evolving iridium surfaces.

Acid-base properties of N-doped carbon nanotubes : a combined temperature-programmed desorption, X-ray photoelectron spectroscopy, and 2-propanol reaction investigation (2016)
Journal Article
Ortega, K., Arrigo, R., Frank, B., Schlögl, R., & Trunschke, A. (2016). Acid-base properties of N-doped carbon nanotubes : a combined temperature-programmed desorption, X-ray photoelectron spectroscopy, and 2-propanol reaction investigation. Chemistry of Materials, 28(19), 6826-6839. https://doi.org/10.1021/acs.chemmater.6b01594

Chemical and electronic properties of N-doped multiwalled carbon nanotubes (NCNTs) synthesized by NH3 treatment of preoxidized CNTs at 300, 500, and 700°C have been investigated by a set of surface sensitive techniques. Temperature-programmed desorpt... Read More about Acid-base properties of N-doped carbon nanotubes : a combined temperature-programmed desorption, X-ray photoelectron spectroscopy, and 2-propanol reaction investigation.

Pd supported on carbon nitride boosts the direct hydrogen peroxide synthesis (2016)
Journal Article
Arrigo, R., Schuster, M., Abate, S., Giorgianni, G., Centi, G., Perathoner, S., …Schlögl, R. (2016). Pd supported on carbon nitride boosts the direct hydrogen peroxide synthesis. ACS catalysis, 6(10), 6959-6966. https://doi.org/10.1021/acscatal.6b01889

Herein, the development of an improved Pd on carbon nitride catalyst for direct H2O2 synthesis from the elements is reported. Microcalorimetric CO chemisorption is used to characterize the chemical speciation of the Pd-selective and -unselective si... Read More about Pd supported on carbon nitride boosts the direct hydrogen peroxide synthesis.

Reactive oxygen species in iridium-based OER catalysts (2016)
Journal Article
Arrigo, R. (2016). Reactive oxygen species in iridium-based OER catalysts. Chemical Science, 2016(7), 6791-6795. https://doi.org/10.1039/c6sc01860b

Tremendous effort has been devoted towards elucidating the fundamental reasons for the higher activity of hydrated amorphous IrIII/IV oxyhydroxides (IrOx) in the oxygen evolution reaction (OER) in comparison with their crystalline counterpart, ruti... Read More about Reactive oxygen species in iridium-based OER catalysts.

Characterization of platinum and iridium oxyhydrate surface layers from platinum and iridium foils (2016)
Journal Article
Johnson, B., Ranjan, C., Greiner, M., Arrigo, R., Schuster, M., Höpfner, B., …Schlögl, R. (2016). Characterization of platinum and iridium oxyhydrate surface layers from platinum and iridium foils. ChemSusChem, 9(13), 1634-1646. https://doi.org/10.1002/cssc.201600143

Platinum and iridium polycrystalline foils were oxidized electrochemically through anodization to create thin platinum and iridium hydrous oxide layers, which were analyzed through laboratory photoelectron spectroscopy during heating and time series... Read More about Characterization of platinum and iridium oxyhydrate surface layers from platinum and iridium foils.

The electronic structure of iridium oxide electrodes active in water splitting (2015)
Journal Article
Pfeifer, V., Jones, T., Velasco Vélez, J., Massué, C., Greiner, M., Arrigo, R., …Schlögl, R. (2015). The electronic structure of iridium oxide electrodes active in water splitting. Physical Chemistry Chemical Physics, 2016(18), 2292-2296. https://doi.org/10.1039/c5cp06997a

Iridium oxide based electrodes are among the most promising candidates for electrocatalyzing the oxygen evolution reaction, making it imperative to understand their chemical/electronic structure. However, the complexity of iridium oxide's electronic... Read More about The electronic structure of iridium oxide electrodes active in water splitting.

Photoelectron spectroscopy at the graphene-liquid interface reveals the electronic structure of an electrodeposited cobalt/graphene electrocatalyst (2015)
Journal Article
Velasco-Vélez, J., Pfeifer, V., Hävecker, M., Weatherup, R., Arrigo, R., Chuang, C., …Knop-Gericke, A. (2018). Photoelectron spectroscopy at the graphene-liquid interface reveals the electronic structure of an electrodeposited cobalt/graphene electrocatalyst. Angewandte Chemie International Edition, 54(48), 14554-14558. https://doi.org/10.1002/anie.201506044

Electrochemically grown cobalt on graphene exhibits exceptional performance as a catalyst for the oxygen evolution reaction (OER) and provides the possibility of controlling the morphology and the chemical properties during deposition. However, the d... Read More about Photoelectron spectroscopy at the graphene-liquid interface reveals the electronic structure of an electrodeposited cobalt/graphene electrocatalyst.

In situ investigation of dissociation and migration phenomena at the Pt/electrolyte interface of an electrochemical cell (2015)
Journal Article
Law, Y., Zafeiratos, S., Neophytides, S., Orfanidi, A., Costa, D., Dintzer, T., …Savinova, E. (2015). In situ investigation of dissociation and migration phenomena at the Pt/electrolyte interface of an electrochemical cell. Chemical Science, 6(10), 5635-5642. https://doi.org/10.1039/c5sc01421b

The development of efficient energy conversion systems requires precise engineering of electrochemical interfaces and thus asks for in situ techniques to probe the structure and the composition of the dynamic electrode/electrolyte interfacial region.... Read More about In situ investigation of dissociation and migration phenomena at the Pt/electrolyte interface of an electrochemical cell.

Nature of the N-Pd interaction in nitrogen-doped carbon nanotube catalysts (2015)
Journal Article
Arrigo, R. (2015). Nature of the N-Pd interaction in nitrogen-doped carbon nanotube catalysts. ACS catalysis, 5(5), 2740-2753. https://doi.org/10.1021/acscatal.5b00094

In this work, the geometric and electronic structure of N species in N-doped carbon nanotubes (NCNTs) is derived by X-ray photoemission (XPS) and absorption spectroscopy (NEXAFS) of the N 1s core excitation. Substitutional N species in pyridine-like... Read More about Nature of the N-Pd interaction in nitrogen-doped carbon nanotube catalysts.

Dynamics of palladium on nanocarbon in the direct synthesis of H2O2 (2013)
Journal Article
Arrigo, R., Schuster, M., Abate, S., Wrabetz, S., Amakawa, K., Teschner, D., …Schlögl, R. (2013). Dynamics of palladium on nanocarbon in the direct synthesis of H2O2. ChemSusChem, 7(1), 179-194. https://doi.org/10.1002/cssc.201300616

This work aims to clarify the nanostructural transformation accompanying the loss of activity and selectivity for the hydrogen peroxide synthesis of palladium and gold–palladium nanoparticles supported on N‐functionalized carbon nanotubes. High‐resol... Read More about Dynamics of palladium on nanocarbon in the direct synthesis of H2O2.