Revathi Bacsa

Laboratoire de Chimie de Coordination

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Wolfgang Bacsa

Centre National de la Recherche Scientifique

Philippe Serp

Institut Universitaire de France

Christophe Laurent

Centre Interuniversitaire de Recherche et d’Ingénierie des Matériaux

P Puech

Centre d’Élaboration de Matériaux et d’Études Structurales

Emmanuel Flahaut

Université Toulouse III - Paul Sabatier

Bruno Machado

Ab Analitica (Italy)

A. Bassil

Lebanese University

T.G. Myers

Centre de Recerca Matemàtica

A. Peigney

Université Toulouse III - Paul Sabatier

Lászlø Forró

École Polytechnique Fédérale de Lausanne

Cooperative Institutions

Centre National de la Recherche Scientifique

Université Toulouse III - Paul Sabatier

Université de Toulouse

École Polytechnique Fédérale de Lausanne

Institut National Polytechnique de Toulouse

Centre Interuniversitaire de Recherche et d’Ingénierie des Matériaux

Universidade do Porto

Centre d’Élaboration de Matériaux et d’Études Structurales

Laboratoire de Chimie de Coordination

Institute for Basic Science

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Synergistic effect between few layer graphene and carbon nanotube supports for palladium catalyzing electrochemical oxidation of alcohols

Journal of Energy Chemistry (2013)

Bruno Machado Andrea Marchionni Revathi Bacsa Marco Bellini Julien Beausoleil

10.1016/s2095-4956(13)60036-4

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Citations (35)

Decorated (Coated) Carbon Nanotubes: (X/CNTs)

Revathi Bacsa Philippe Serp

This chapter contains sections titled: Introduction Metal-Nanotube Interactions – Theoretical Aspects Carbon Nanotube Surface Activation Methods for Carbon Nanotube Coating Characterization of Decorated Nanotubes Applications of Decorated Nanotubes Decorated Nanotubes in Biology and Medicine Conclusions and Perspectives References

Characterization

Carbon nanobud

Carbon nanotube actuators

10.1002/9781119954743.ch4

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Citations (5)

Proton-Conducting Polymer Wrapped Cathode Catalyst for Enhancing Triple-Phase Boundaries in Proton Exchange Membrane Fuel Cells

ACS Applied Energy Materials (2021)

Meenakshi Seshadhri Garapati Divya Nechiyil S. Joulié Revathi Bacsa Sundara Ramaprabhu

The performance of proton exchange membrane fuel cells (PEMFCs) depends on the oxygen reduction reaction (ORR) kinetics and durability of the cathode catalyst. This can be achieved by tailoring cathode structure to increase the number of triple-phase boundaries. Herein, different weight percentages of proton-conducting poly(vinylphosphonic acid) (PVPA) wrapped nitrogen and sulfur dual atoms doped longitudinally exfoliated carbon nanotubes (PX_NSPNT, X-1, 3, 6, and 9 wt %) is synthesized as the catalyst support for Pt/Pt-alloy nanoparticles (Pt/PX_NSPNT) to improve the triple-phase boundary density and durability of cathode catalyst. Raman spectroscopy and transmission electron microscopy analysis infer that polymer coating and N–S dopant sites provide the anchoring sites for Pt nanoparticles, which can enhance the durability of the catalyst. Besides, half-cell studies shows that with increasing PVPA wt % (until 6 wt %), the activity of the electrocatalyst also increases, suggesting PVPA has contributed to enhancing the diffusion of ions and mass-transfer kinetics. The accelerated durability test signifies the robustness of Pt/P6_NSPNT catalyst, which can retain 80% of its electrochemical active surface area after 15000 potential cycles. In single-cell studies, Pt/P6_NSPNT and Pt–Co/P6_NSPNT cathode electrocatalyst deliver power densities of 923 and 1090 mW cm–2, respectively, at 60 °C, which is the highest among all other PVPA weight percentages, Pt/NSPNT, and commercial Pt/C catalyst. The methodical variation of PVPA wt % helps to find the optimum proton-conducting polymer content on the electrocatalyst for achieving high-performance and durability of PEMFC.

10.1021/acsaem.1c03143

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Citations (8)

Synthesis of Monodisperse Spherical Nanocrystals

T.G. Myers Vincent Cregan Revathi Bacsa Marc Calvo-Schwarzwälder Mario Fernández-Pendás

Nanoparticles, small units of matter with dimensions in the range1-100 nm, exhibit many advantageous size-dependent magnetic, electrical, chemical and optical properties, which are not observed at the micro scale or bulk. These properties are extremely sensitive to particle size, and thus the ability to produce monodisperse particles is critical. Due to its ease of use and flexibility, precipitation of nanoparticles from solution is one of the most widely used synthesis methods. The main disadvantage of this method is that the relationship between particle growth and system conditions is not fully understood. In practice, the optimal reaction conditions are usually ascertained empirically or intuitively. In this report we consider several different applied mathematical techniques to explain nanoparticle growth via the precipitation method. In particular, we describe the impact of size focussing and defocussing (or Ostwald ripening) on the evolution of the nanoparticle size distribution.

Dispersity

Ostwald ripening

Particle (ecology)

Length scale

10.33774/miir-2021-2qws1

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High specific surface area carbon nanotubes from catalytic chemical vapor deposition process

Chemical Physics Letters (2000)

Revathi Bacsa Christophe Laurent A. Peigney Wolfgang Bacsa T. Vaugien

Carbon fibers

Deposition

10.1016/s0009-2614(00)00558-3

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Citations (182)

Effect of rutile phase on the photocatalytic properties of nanocrystalline titania during the degradation of p-coumaric acid

Applied Catalysis B Environment and Energy (1998)

Revathi Bacsa J. Kiwi

Rutile

Nanocrystalline material

Photodegradation

10.1016/s0926-3373(97)00058-1

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Citations (357)

Structural and mechanical properties of double wall carbon nanotubes

TechConnect Briefs (2004)

Revathi Bacsa A. Peigney P Puech Hannes Hübel D. J. Dunstan

Narrow diameter double wall carbon nanotubes can be grown with high yield by catalytic chemical vapor deposition. Double walled carbon nanotubes are the molecular analogs of coaxial cables. The external tube protects the internal tube from its environment and isolates the electric conductor of sub-nanometer dimension over micrometer long distances. While it is still particularly difficult to grow tubes of controlled helicity, inelastic light scattering is a powerful tool to find the helicity of narrow diameter internal tubes and explore their mechanical properties. We have examined the inelastic light scattering spectrum of narrow double walled carbon nanotubes to specify their helicity and to study their mechanical stability under hydrostatic pressure.

Coaxial

Helicity

Hydrostatic pressure

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Gram-scale CCVD synthesis of double-walled carbon nanotubes

Chemical Communications (2003)

Emmanuel Flahaut Revathi Bacsa Alain Peigney Christophe Laurent

Synthesis of clean double-walled carbon nanotubes by a catalytic chemical vapour deposition (CCVD) method is reported; the catalyst is a Mg(1 - x)Co(x)O solid solution containing additions of Mo oxide; this MgO-based catalyst can be easily removed, leading to gram-scale amounts of clean carbon nanotubes, 77% of which are double-walled carbon nanotubes.

Frit compression

Carbon fibers

10.1039/b301514a

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Citations (390)

Chemical Vapor Synthesis of Zinc Oxide Nanoparticles: Experimental and Preliminary Modeling Studies

The Journal of Physical Chemistry C (2009)

Nicolas Reuge Revathi Bacsa Philippe Serp Brigitte Caussat

The chemical vapor synthesis of ZnO tetrapods from zinc metal has been studied using a combination of experiments and fluid dynamics modeling. On one hand, an experimental study allowed production of ultrapure ZnO particles whose mean lengths (250−450 nm) and diameters (14−27 nm) depended on the reactor configuration (i.e., parallel flow/crossflow), but not on the position of air injection. On the other hand, the yield of the reaction depended both on the reactor configuration and on the position of air injection. We then developed an original kinetic model implemented in the computation fluid dynamics code FLUENT. Within the limits of certain assumptions, the model successfully predicts the experimental yield of the reaction for all the conditions tested. This good agreement shows that the kinetics of nucleation/growth of ZnO nanoparticles are probably very rapid compared to the reaction of oxidation of Zn vapor. The combination of the experimental and simulated results led to a better understanding of the heat- and mass-transfer phenomena involved. Finally, several processing parameters, such as argon and air flow rates, position of air injection, and reactor diameter, were varied in the simulations to find optimized reaction conditions for maximum yield and production rate. For the crossflow configuration, a yield of 71% and a production rate 7 times higher than the nominal value have been obtained.

10.1021/jp9070955

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Citations (44)

Oxidized few layer graphene and graphite as metal-free catalysts for aqueous sulfide oxidation

Journal of Materials Chemistry A (2013)

Bruno Rocha Santos Lemos Ivo F. Teixeira Bruno Machado Marcos R. A. Alves João P. de Mesquita

Few layer graphene and natural graphite were chemically modified by oxidation with HNO3 at 80 and 140 °C and used to promote the oxidation of sulfide ions in aqueous solutions. TEM, potentiometric titration, XRD, BET and Raman spectroscopy show that HNO3 treatment even at 140 °C did not modify the graphene and graphite morphologies but produced significant amounts of different oxygen surface groups. The presence of these groups on few layer graphene and graphite strongly increased the Saq2− oxidation, showing activities comparable to a high surface area activated carbon with a similar amount of oxygen surface groups. The obtained results suggest that the sulfide oxidation efficiency requires a balance between two important effects, i.e. the presence of oxygen functionalities to initiate the Saq2− oxidation and the electrical conductivity that is important to further transfer the electrons removed from sulfide.

Carbon fibers

10.1039/c3ta10541e

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Citations (26)