Ferdinand Hof

Centre National de la Recherche Scientifique

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Alain Pénicaud

Paul Pascal Research Center

Emmanuel Picheau

Paul Pascal Research Center

Andreas Hirsch

Friedrich-Alexander-Universität Erlangen-Nürnberg

Alain Derré

Paul Pascal Research Center

D.W. Johnson

Frank Hauke

Friedrich-Alexander-Universität Erlangen-Nürnberg

Peter M. Iovine

University of San Diego

Kai Huang

Chinese Academy of Sciences

Hoong‐Kun Fun

King Saud University

G. Mehta

Cooperative Institutions

Centre National de la Recherche Scientifique

Friedrich-Alexander-Universität Erlangen-Nürnberg

Université de Bordeaux

Paul Pascal Research Center

Center for Research in Psychopathology and Clinical Psychology

Institut des Matériaux Jean Rouxel

University of Bologna

ETH Zurich

Scripps Research Institute

Nantes Université

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From Food Waste to Efficient Bifunctional Nonprecious Electrocatalyst

Chemistry - A European Journal (2017)

Ferdinand Hof Alessandro Boni Giovanni Valenti Kai Huang Francesco Paolucci

Synergy between graphitic nanocarbon, obtainable from food waste through cracking of biomethane, and iron oxide nanoparticles provides access to efficient bifunctional electro catalysts. Dissolution of potassium-intercalated graphitic nanocarbons yields graphenide solutions with calibrated, small lateral size-reduced graphenes that are used subsequently as reducing agents of iron metal salts. This results in the strong binding of small size (2-5 nm) nanoparticles on the carbon framework homogeneously within the composite material, accessibility of the catalytic centers, and good conductivity provided by the underlying carbon framework. The iron oxide nanocarbon electrocatalyst performances are highlighted by the overall overpotential of approximately 1 V needed to reach the benchmark threshold of 10 mA cm-2 for the oxygen reduction reaction and the particular activity towards oxygen evolution reaction (η≈0.4 V at 10 mA cm-2 ), comparable to that of the precious RuO2 and IrO2 catalysts. This iron oxide/nanocarbon electrocatalyst is versatile, remarkably active, stable, and truly sustainable.

Food Waste

10.1002/chem.201704041

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Citations (9)

Influence of Defects and Charges on the Colloidal Stabilization of Graphene in Water

Chemistry - A European Journal (2024)

João Paulo Vita Damasceno Emmanuel Picheau Ferdinand Hof Aldo J. G. Zarbin Alain Pénicaud

Mastering graphene preparation is an essential step to its integration into practical applications. For large-scale purposes, full graphite exfoliation appears as a suitable route for graphene production. However, it requires overpowering attractive van der Waals forces demanding large energy input, with the risk of introducing defects in the material. This difficulty can be overcome by using graphite intercalation compounds (GICs) as starting material. The greater inter-sheet separation in GICs (compared with graphite) allows the gentler exfoliation of soluble graphenide (reduced graphene) flakes. A solvent exchange strategy, accompanied by the oxidation of graphenide to graphene, can be implemented to produce stable aqueous graphene dispersions (Eau de graphene, EdG), which can be readily incorporated into many processes or materials. In this work, we prove that electrostatic forces are responsible for the stability of fully exfoliated graphene in water, and explore the influence of the oxidation and solvent exchange procedures on the quality and stability of EdG. We show that the amount of defects in graphene is limited if graphenide oxidation is carried out before exposing the material to water, and that gas removal of water before the incorporation of pre-oxidized graphene is advantageous for the long-term stability of EdG.

Exfoliation joint

10.1002/chem.202303508

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”Eau de graphene” from a KC₈ graphite intercalation compound prepared by a simple mixing of graphite and molten potassium

physica status solidi (RRL) - Rapid Research Letters (2016)

George Bepete Ferdinand Hof Kai Huang Katerina Kampioti Éric Anglaret

We synthesized KC 8 by simply mixing molten potassium and graphite at 180 °C under inert atmosphere. The KC 8 shows typical shiny bronze color, Raman characteristics and XRD pattern of an efficiently intercalated stage 1 GIC, and is of sufficient quality to produce fully exfoliated graphenide solutions in tetrahydrofuran (THF) and subsequently single layer graphene in water as ”eau de graphene” (EdG). The evolution of absorption and Raman spectroscopic signatures of the EdG as a function of processing conditions give key indications on the number of layers of the graphene flakes dispersed in EdG. (© 2016 WILEY‐VCH Verlag GmbH &Co. KGaA, Weinheim)

Inert gas

Inert

10.1002/pssr.201600167

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Citations (23)

CCDC 711328: Experimental Crystal Structure Determination

The Cambridge Structural Database (2009)

M. Zurcher Ferdinand Hof Luzi Jakob Barandun A. Schuetz W. Bernd Schweizer

10.5517/ccrw62w

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Frontispiece: An Introduction to the Combustion of Carbon Materials

Chemistry - A European Journal (2022)

Emmanuel Picheau Sara Amar Alain Derré Alain Pénicaud Ferdinand Hof

Although carbon combustion has a long tradition to be used for energy production, there are still limitations to the complete understanding of the reaction. A brief summary of the history of carbon combustion together with a detailed discussion of its most important aspects is given in the Review article by F. Hof et al (DOI: 10.1002/chem.202200117).

Carbon fibers

10.1002/chem.202285461

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Size Control of Nanographene Supported Iron Oxide Nanoparticles Enhances Their Electrocatalytic Performance for the Oxygen Reduction and Oxygen Evolution Reactions

The Journal of Physical Chemistry C (2019)

Ferdinand Hof Meng Liu Giovanni Valenti Emmanuel Picheau Francesco Paolucci

Reduced carbon layers, differing in lateral dimension, are exploited as reduction agents for iron(II) salts, resulting in the decoration of the carbon framework by iron oxide nanoparticles. Depending on the choice of the carbon starting material, the average size of the formed nanoparticles is situated between 3 and 50 nm. Those composite materials, free of stabilization or capping agents, show remarkable catalytic activity in the oxygen reduction reaction (ORR) and in the oxygen evolution reaction (OER). The electrochemical performance, the activity, and the selectivity depends dramatically on the respective size of the nanoparticles generated.

Oxygen evolution

10.1021/acs.jpcc.9b05843

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Citations (16)

CCDC 711328: Experimental Crystal Structure Determination

M. Zurcher Ferdinand Hof Luzi Jakob Barandun A. Schuetz W. Bernd Schweizer

Source

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CCDC 184672: Experimental Crystal Structure Determination

The Cambridge Structural Database (2002)

D.W. Johnson Liam C. Palmer Ferdinand Hof Peter M. Iovine J. Rebek

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.

Crystal (programming language)

10.5517/cc6655q

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CCDC 173849: Experimental Crystal Structure Determination

The Cambridge Structural Database (2002)

Ferdinand Hof Peter M. Iovine D.W. Johnson J. Rebek

Crystal (programming language)

10.5517/cc5tx1x

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The role of functionalization on the colloidal stability of aqueous fullerene C60 dispersions prepared with fullerides