A reverse microemulsion procedure has been adopted for the preparation of 20 wt % RuxSey/C (where x = 1 and y = 0- 1). This system has been examined for electrochemical oxygen reduction activity. The measured oxygen reduction activity was comparable with that of commercial Pt/C (E-TEK). The activity is due to stabilization of Ru active sites by Se against blocking as a result of (hydr)oxide formation. © 2007 American Chemical Society.

Ch Venkateswara Rao

Balasubramanian Viswanathan

Electrodes

Microemulsions

Oxygen

reduction

ELECTROCHEMICAL OXYGEN REDUCTION

RU ACTIVE SITES

ruthenium

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Journal of Physical Chemistry C

Carbon-supported Pd and Pd-Co-Au alloy electrocatalysts are prepared by water-in-oil microemulsion technique using water as aqueous phase, non-ionic Triton-X-100 as surfactant, and cyclohexane as oil phase. The materials are characterized using XRD, TEM, and EDX. Face-centered cubic structure of Pd and presence of respective elements with controllable composition is evident from the analysis of XRD and EDX. The role of alloying elements on the redox behavior as well as catalytic activity of Pd is studied by cyclic voltammetry and ultraviolet photoelectron spectroscopy. Electrochemical measurements performed by rotating disk electrode voltammetry indicate the good ORR activity of Pd-Co-Au/C compared to Pd/C. © 2011 Elsevier Inc.

Journal of Colloid and Interface Science

Microemulsion synthesis and electrocatalytic properties of carbon-supported Pd-Co-Au alloy nanoparticles

Carbon black (CDX975) supported Pd and Pd-Co-Mo alloy nanoparticles are prepared by the reduction of metal precursors with hydrazine in reverse microemulsion of water/Triton-X-100/propanol-2/cyclohexane. The as-synthesized Pd-Co-Mo/CDX975 is heat treated at 973, 1073 and 1173 K to promote alloy formation. The prepared materials are characterized by powder XRD and EDX. Face-centred cubic structure of Pd is evident from XRD. The chemical composition of the respective elements in the catalysts is evaluated from the EDX analysis and observed that it is in good agreement with initial metal precursor concentrations. Oxygen reduction measurements performed by linear sweep voltammetry indicate the good catalytic activity of Pd-Co-Mo alloys compared to Pd. This is due to the suppression of (hydr)oxy species on Pd surface by the presence of alloying elements, Co and Mo. Among the investigated catalysts, heat-treated Pd-Co-Mo/CDX975 at 973 K exhibited good ORR activity compared to the catalysts heat treated at 1073 and 1173 K. This is due to the small crystallite size and high surface area. Rotating disk electrode (RDE) measurements indicated the comparable ORR activity of heat-treated Pd-Co-Mo/CDX975 at 973 K with that of commercial Pt/C. Kinetic analysis reveals that the ORR on Pd-Co-Mo/CDX975 follows the four-electron pathway leading to water. Moreover, Pd-Co-Mo/CDX975 exhibited substantially higher ethanol tolerance during the ORR than Pt/C. Good dispersion of metallic nanoparticles on the carbon support is observed from HRTEM images. Single-cell direct ethanol fuel cell tests indicated the comparable performance of Pd-Co-Mo/CDX975 with that of commercial Pt/C. Stability under DEFC operating conditions for 50 h indicated the good stability of Pd-Co-Mo/CDX975 compared with that of Pt/C. © 2010 Elsevier Ltd. All rights reserved.

Electrochimica Acta

Carbon supported Pd-Co-Mo alloy as an alternative to Pt for oxygen reduction in direct ethanol fuel cells

Carbon-supported Ir, Rh, IrSe, and RhSe were synthesized and subjected to electrochemical and physical (XRD, TEM) characterizations. ORR activity, peroxide generation, and methanol tolerance on carbon-supported Ir, Rh, IrSe, and RhSe were compared to a similarly prepared Pt and RuSe catalysts at comparable loading. Electrochemical characteristics of selenides studied using cyclic voltammetry and Cu stripping demonstrated complete suppression of the formation of oxygenated species and Hupd on the catalyst surface by Se. In presence of methanol, all selenides exhibited high methanol tolerance, and their oxygen reduction activities were in the order of Ir&lt;Pt&lt;Rh&lt; IrSe&lt;RhSe&lt;RuSe. Potential dependant peroxide generation features on Ir and Rh differed significantly from that on Pt. Peroxide generation on selenides were also different from those of the corresponding bare metal catalysts (without Se). On all catalysts the peroxide generation in the reverse scan was higher than that in the forward scan. © 2011 The Electrochemical Society.

Journal of the Electrochemical Society

Oxygen reduction reaction and peroxide generation on Ir, Rh, and their selenides - A comparison with Pt and RuSe

Energy Sources

Photo-Catalytic Routes for Fuel Production

The Journal of Physical Chemistry C

Genesis of RuxSeyNanoparticles by Pyrolysis of Ru4Se2(CO)11: A Combined X-ray in Situ and DFT Study

Activity, Selectivity, and Methanol Tolerance of Se-Modified Ru/C Cathode Catalysts

Surface Modified Ruthenium Nanoparticles: Structural Investigation and Surface Analysis of a Novel Catalyst for Oxygen Reduction

Langmuir

Electrochemical Surface Characterization and O2Reduction Kinetics of Se Surface-Modified Ru Nanoparticle-Based RuSey/C Catalysts†

RuxSey/C electrodes for oxygen reduction - A reverse microemulsion method of fabrication of electrode material

Journal	Journal of Physical Chemistry C
ISSN	19327447
Open Access	No