Enhancement of ethanol oxidation on Pd nanoparticles supported on carbon-antimony tin oxide hybrids unveils the relevance of electronic effects

Alvarenga, Gabriel M.; Gallo, Irã Borges Coutinho; Villullas, Hebe M.

doi:10.1016/j.jcat.2017.02.002

Cited by 43 publications

(26 citation statements)

References 64 publications

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“…The Nafion® membranes (N117, DuPont) underwent the standard procedure for cleaning and anionic activation through successive washing steps. The MEAs were prepared as described previously, in which a Pt/Vulcan XC72 (BASF) commercial cathode (1 mg (Pt) cm −2 ) and either a homemade Pd 1 Nb 1 /carbon black anode (1 mg (Pd) cm −2 ) or a commercial Pd/C (Alfa Aesar) anode (1 mg (Pd) cm −2 ) were used at 125 °C for 420 s under a pressure of 247 kgf cm −2 . The MEA was placed between two bipolar plates and assembled in a single fuel cell …”

Section: Methodsmentioning

confidence: 99%

“…This auxiliary metal facilitates the oxidation of carbon monoxide and intermediates adsorbed to the effective metal by means of, mainly the electronic and bifunctional effects. The electronic effect acts in decreasing the adsorption force of carbon monoxide due to the filling of the “d” band of the effective metal, in this case, Pd . The bifunctional effect facilitates carbon monoxide oxidation by means of oxygenated species supplied by the auxiliary metal …”

Section: Introductionmentioning

confidence: 99%

“…The electronic effect acts in decreasing the adsorption force of carbon monoxide due to the filling of the "d" band of the effective metal, in this case, Pd. [12,13] The bifunctional effect facilitates carbon monoxide oxidation by means of oxygenated species supplied by the auxiliary metal. [14,15] Recently, Yahya et al [16] applied binary PdÀ Au electrocatalysts supported on vapor grown carbon nanofiber at a 1 : 1 ratio, and demonstrated the highest power density of 7 mW cm À 2 in ADGFC, where the presence of Au as the second metal reduces the poisoning effect and leads to higher CO tolerance than using pure Pd and Au separately.…”

Section: Introductionmentioning

confidence: 99%

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Niobium Enhances Electrocatalytic Pd Activity in Alkaline Direct Glycerol Fuel Cells

et al. 2019

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Pd x Nb y /C binary electrocatalysts supported on Printex 6 L carbon black were prepared by using an adapted chemical reduction method with sodium borohydride. The electrocatalysts were characterized by using SEM, TEM, XRD, EDS, ICP-MS, water contact angle and Raman spectroscopy. The best performance for the alkaline direct glycerol fuel cell (ADGFC) was obtained by using Pd 1 Nb 1 /C, which yielded a maximum power density of 27 mW cm À 2 at 70°C. Residues of products formed from the glycerol oxidation were analyzed by using FT-Raman and high-performance liquid chromatography (HPLC).The Pd 1 Nb 1 /C electrocatalyst exhibited a more negative onset potential for the CO oxidation reaction and a higher conversion rate of glycerol to carbonate. We suggest that the higher hydrophilicity, higher degree of disorder, and bifunctional effects enhanced the electrocatalytic activity of Pd, as Nb facilitated the oxidation of adsorbed CO in Pd and increased the transfer rate of electron from Pd to carbon black support Therefore, Nb is a promising co-catalyst for Pd-based electrocatalysts for ADGFCs.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Niobium Enhances Electrocatalytic Pd Activity in Alkaline Direct Glycerol Fuel Cells

et al. 2019

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“…Antimony tin oxide (ATO) is a kind of semiconductor material with excellent electrochemical stability. It has better electrical conductivity than other metal oxide materials, but still needs to be promoted . Besides, ATO as metal oxide is very difficult to uniformly load Pt nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Pt Supported on Carbon‐coating Antimony Tin Oxide as Anode Catalyst for Direct Methanol Fuel Cell

et al. 2018

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A qualified support material for Pt must has numerous deposition sites for Pt nanoparticles and great electrical conductivity. Metal oxide materials are potential support materials for Pt nanoparticles. However, they have less deposition sites for Pt and worse electronic conductivity than carbon. Carbon over the surface of metal oxide materials can improve the above shortage. In this paper, antimony tin oxide (ATO) coated by carbon layer has been successfully prepared by plasma enhanced chemical vapor deposition method (PECVD). PECVD can provide a brief approach to enwrap metal oxide with carbon at low temperatures. Besides, it becomes easier to control the amount of carbon by the PECVD to create much more two‐phase interface for Pt deposition. The carbon layer promotes the electronic conductivity of ATO and provides more deposition sites for platinum nanoparticles, which directly influence the size of Pt nanoparticles as well as the electrochemical active surface areas. The as‐prepared catalyst exhibits excellent activity for methanol oxidation reaction (MOR), which is twice of that of the commercial Pt/C catalyst. Meanwhile, it has better stability than the commercial Pt/C.

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“…Despite the fact that measurements around the Pd L3 edge are rather scarce for carbon-supported Pd and Pd-based nanoparticles, analysis of https://doi.org/10.1016/j.elecom.2018.07.023 Received 10 July 2018; Received in revised form 25 July 2018; Accepted 26 July 2018 the XANES region of spectra acquired under high-vacuum conditions has shed some light on the role of the electronic occupation of the Pd 4d band in electrocatalytic reactions [11,12] and electrochemical surface processes [13].…”

Section: Introductionmentioning

confidence: 99%

A novel electrochemical cell for operando X-ray absorption measurements at low energies: Probing electrochemically induced electronic changes in palladium

Villullas

Ometto

Alvarenga

et al. 2018

Electrochemistry Communications

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A B S T R A C TOperando assessment of electronic properties near the Fermi level is essential to gain new insights into the mechanisms of electrochemical reactions as well as for the development of more efficient electrocatalysts. However, the high vacuum ambient needed for X-ray absorption measurements at low energies has made studies under electrochemical conditions quite challenging. Here, we describe an out-of-chamber setup with a new electrochemical cell that allowed us to performed operando X-ray absorption studies at the low energy of the Pd L3 edge. Using the new electrochemical cell, we were able to probe, for the first time, the changes in electronic properties of carbon-supported Pd nanoparticles induced by the electrochemical oxidation of the Pd surface. Our results demonstrate that the oxidation process produces an increase in the Pd 4d band vacancy, which indicates that charge is transferred from the metal to the adsorbed oxygenated species.

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Enhancement of ethanol oxidation on Pd nanoparticles supported on carbon-antimony tin oxide hybrids unveils the relevance of electronic effects

Cited by 43 publications

References 64 publications

Niobium Enhances Electrocatalytic Pd Activity in Alkaline Direct Glycerol Fuel Cells

Niobium Enhances Electrocatalytic Pd Activity in Alkaline Direct Glycerol Fuel Cells

Pt Supported on Carbon‐coating Antimony Tin Oxide as Anode Catalyst for Direct Methanol Fuel Cell

A novel electrochemical cell for operando X-ray absorption measurements at low energies: Probing electrochemically induced electronic changes in palladium

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