Trimetallic catalyst based on PtRu modified by irreversible adsorption of Sb for direct ethanol fuel cells

Abstract

Abstract:In this work, PtRu/C-Sb materials prepared by adding a Sb salt to the ink of commercial PtRu/C were studied as catalysts for ethanol oxidation. The prepared trimetallic catalysts showed enhanced properties for ethanol oxidation trough a wide range of surface coverages. However, coverage higher than 0.7 of Sb on PtRu/C causes the decrease of the catalytic activity suggesting that specific sites composed by the 3 metals are necessary to achieve the highest performance. In situ Fourier Transformed Infrared Spectroscopy experiments were also performed to compare the reaction products of the bimetallic and trimetallic catalysts. The catalysts were also tested under fuel cell conditions. Also in this case, higher power densities, higher open circuit voltages and better stability than the bimetallic substrate were found. With this catalyst preparation method, the catalysts showed 2 times higher current densities than for the PtRu catalysts and 6 times better than for pure Pt anodes.

Fast and Controlled Decorating of Metallic Nanoparticles Using Wall‐jet Configuration

“…Thus, new fast methodologies are needed. For this purpose, several strategies to synthesise nanoparticles (NPs) rapidly have been proposed . These methods allied to the in situ surface characterisation represent a considerable time saving.…”

“…We used different combinations of volume, injection flow rate and precursor concentration to decorate Pt NPs with different θ Sb and θ Sn as shown in Table . θ M was calculated taking into account the changes in the hydrogen under potential deposition region (H UPD ) after the decoration procedure, as reported elsewhere . Briefly, the decorating of Pt with Sb or Sn prevents H adsorption, which leads to a decrease in the desorption charge of H on Pt.…”

Decorating Pt/C Nanoparticles with Ru by Wall‐Jet Configuration: The Role of Coverage Degree on the Catalyst Activity for Glycerol Electrooxidation

“…Much effort has been spent to synthesize, characterize, and apply new multi‐metallic catalysts for glycerol electrooxidation reaction (GEOR) . Among the emerging catalysts, we should give special attention to Ru‐based materials, since their synthesis has been widely used and improved for almost 30 years . Such knowledge made PtRu nanoparticles (NPs) broadly commercialized and available.…”

Flexible Solid‐State Direct Ethanol Fuel Cell Catalyzed by Nanoporous High‐Entropy Al‐Pd‐Ni‐Cu‐Mo Anode and Spinel (AlMnCo)3O4 Cathode

“…Portable fuel cells, especially direct ethanol fuel cells (DEFCs), have received broad interest mainly due to their superior energy densities to batteries, low-cost and environmental friendliness. [1][2][3][4][5][6][7][8] Compared with rigid liquid cells such as traditional proton-exchange membrane and anion exchange membrane DEFCs, [9,10] developing flexible and even wearable solid-state DEFCs which can work efficiently and stably at room temperature is very important for extending their application adjust the electronic structure of Pd. Note that the selected X should be soluble to some extent in the PdNiCu alloy.…”