Carbon-Supported Pt and Pt–Ir Nanowires for Methanol Electro-Oxidation in Acidic Media

Ribeiro, Jamylle Yanka Cruz; Neto, Edmundo Sebadelhe Valério; Salazar‐Banda, Giancarlo R.; Eguiluz, Katlin Ivon Barrios

doi:10.1007/s10562-019-02839-y

Cited by 14 publications

(4 citation statements)

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“…[ 45 ] The CO oxidation onset potential on the 15.5 wt% Pt/rutile Ti 0.9 Ir 0.1 O 2 and traditional 20 wt% Pt/C catalysts was observed at around 0.50 and 0.67 V, respectively, versus NHE, suggesting the facilitate CO oxidation on the rutile Ti 0.9 Ir 0.1 O 2 ‐supported low Pt‐loading electrocatalyst. In the CO‐stripping curves, the first peak was ascribable to the CO oxidation [ 52 ] that was found at ≈0.65 V versus NHE and ≈0.78 V versus NHE corresponding to the Pt/rutile Ti 0.9 Ir 0.1 O 2 and Pt/C electrocatalysts, indicating that the rutile Ti 0.9 Ir 0.1 O 2 ‐supported low Pt‐loading showed the CO antipoisoning much greater than the conventional carbon‐supported Pt catalyst. [ 45 ] This was ascribable to the strong interplay between the Pt and the rutile Ti 0.9 Ir 0.1 O 2 nanosupport, bringing about the weak adsorption of the CO on the catalytic Pt surface.…”

Section: Resultsmentioning

confidence: 99%

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Rutile Ti_0.9Ir_0.1O₂‐Supported Low Pt Loading: An Efficient Electrocatalyst for Ethanol Electrochemical Oxidation in Acidic Media

Pham

Huynh

2020

Energy Tech

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Developing a cost‐effective electrocatalyst toward ethanol electrochemical oxidation plays a vital role in large‐scale applications of direct ethanol fuel cells (DEFCs). Herein, a rutile Ti0.9Ir0.1O2‐supported low Pt‐loading catalyst is fabricated using a surfactant‐free one‐pot chemical reduction route at room temperature that not only reduces the amount of the Pt loading but also significantly enhances the CO antipoisoning and electrochemical stability toward ethanol electrochemical oxidation compared with the conventional carbon‐supported Pt electrocatalyst. The rutile Ti0.9Ir0.1O2 nanosupport with rod‐like morphology is first prepared via a one‐pot hydrothermal route, and then 15.5 wt% Pt nanoparticles with small size (≈3 nm) are anchored on it by the surfactant‐free chemical reduction process. For ethanol electrochemical oxidation, the rutile Ti0.9Ir0.1O2‐supported Pt catalyst shows a moderate current density (≈13.74 mA cm−2), which is comparable with the 20 wt% Pt/C electrocatalyst, despite its low loading (15.5 wt%). In addition, the rutile Ti0.9Ir0.1O2‐supported low Pt‐loading electrocatalyst demonstrates low onset potential (0.45 V vs normal hydrogen electrode [NHE]), superior CO‐tolerance, and impressive electrochemical stability compared with the carbon‐supported Pt catalyst. These enhancements are ascribable to the inherent durability of the rutile TiO2 nanostructure and the synergistic effect between Pt and Ti0.9Ir0.1O2 nanosupport.

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Section: Resultsmentioning

confidence: 99%

“…Moreover, the rutile Ti 0.9 Ir 0.1 O 2 ‐supported low Pt‐loading electrocatalyst exhibited two peaks, which was attributable to the CO oxidation process occurring on different surface domains. [ 52,53 ]…”

Section: Resultsmentioning

confidence: 99%

Rutile Ti_0.9Ir_0.1O₂‐Supported Low Pt Loading: An Efficient Electrocatalyst for Ethanol Electrochemical Oxidation in Acidic Media

Pham

Huynh

2020

Energy Tech

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“…This strategy is very promising because it allows the Pt loading in FCs to be reduced. Over the years several dopants have been found to act as promoters on Pt, such as Sn, Ru, Ag, Nb, Mo, Co, Pd, Ni, or Ir [21–32] . It is believed that the dopant not only induces a geometrical change but also affects the local electronic structure of the Pt active sites [33] .…”

Section: Introductionmentioning

confidence: 99%

Doping Platinum with Germanium: An Effective Way to Mitigate the CO Poisoning

et al. 2021

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The vulnerability towards CO poisoning is a major drawback affecting the efficiency and long‐term performance of platinum catalysts in fuel cells. In the present work, by a combination of density functional theory calculations and mass spectrometry experiments, we test and explain the promotional effect of Ge on Pt catalysts with higher resistance to deactivation via CO poisoning. A thorough exploration of the configurational space of gas‐phase Ptn+ and GePtn−1+ (n=5–9) clusters using global minima search techniques and the subsequent electronic structure analysis reveals that germanium doping reduces the binding strength between Pt and CO by hindering the 2π‐back‐donation. Importantly, the clusters remain catalytically active towards H2 dissociation. The ability of Ge to weaken the Pt−CO interaction was confirmed by mass spectrometry experiments. Ge can be a promising alloying agent to tune the selectivity and improve the durability of Pt particles, thus opening the way to novel catalytic alternatives for fuel cells.

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“…Supported catalysts with activated metals on reasonable substrate could effectively reduce the usage of noble metals [13,14]. The strong interaction between substrate and supported species like nanocluster [15,16], nanowire [17,18], alloy [19,20] or monolayer (ML) [21,22] can modulate the catalytic performance further by reorganizing the geometric and electronic structures. For example, the relatively inert Au exhibits a high activity towards CO oxidation even at the temperatures below 0 °C when it was deposited on TiO 2 [23].…”

Section: Introductionmentioning

confidence: 99%

A theoretical study of the improved CO oxidation on WC supported Au monolayer by Cu doping

Chang¹,

Zhang²,

Yang³

2023

Phys. Scr.

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Metal monolayer supported on tungsten carbides have received considerable attention in the field of catalysis, while the adsorption properties of reactants need to be optimized to improve the catalytic activity further. Alloy monolayers on tungsten carbides can deliver different geometric and electronic characters from pure metal layers, owing to the change in local environments. Herein, using the first-principles calculations, the CO oxidation processes on the supported CuAu alloy monolayer on tungsten carbide are systematically investigated and compared with that on pure metal monolayers. It is found that introducing Cu dopant in Au monolayer will elevate the d-band center of the formed alloy monolayer and thus enhancing the adsorption of reactants around the Cu atom, which is caused by the charge redistribution. Especially, the unbalanced interaction strength between Cu-O and Au-O promotes the rotation and migration of oxygen atom to interact with the C atom of CO, which lowers the energy barriers for the formation and dissociation of OOCO intermediate. The oxidation of CO by an atomic O with the largest energy barrier of 0.27 eV along the Langmuir-Hinshelwood pathway is identified as the rate determining step, which is superior or comparable to the reported CO oxidation catalysts. The significance of alloy monolayer on tungsten carbides are further highlighted by comparing the adsorption energy and reaction barrier of rate-limiting step on the pure metal monolayers. This work is insightful for the rational design of highly efficient catalysts based on alloy systems.

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Carbon-Supported Pt and Pt–Ir Nanowires for Methanol Electro-Oxidation in Acidic Media

Cited by 14 publications

References 51 publications

Rutile Ti_0.9Ir_0.1O₂‐Supported Low Pt Loading: An Efficient Electrocatalyst for Ethanol Electrochemical Oxidation in Acidic Media

Rutile Ti_0.9Ir_0.1O₂‐Supported Low Pt Loading: An Efficient Electrocatalyst for Ethanol Electrochemical Oxidation in Acidic Media

Doping Platinum with Germanium: An Effective Way to Mitigate the CO Poisoning

A theoretical study of the improved CO oxidation on WC supported Au monolayer by Cu doping

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Carbon-Supported Pt and Pt–Ir Nanowires for Methanol Electro-Oxidation in Acidic Media

Cited by 14 publications

References 51 publications

Rutile Ti0.9Ir0.1O2‐Supported Low Pt Loading: An Efficient Electrocatalyst for Ethanol Electrochemical Oxidation in Acidic Media

Rutile Ti0.9Ir0.1O2‐Supported Low Pt Loading: An Efficient Electrocatalyst for Ethanol Electrochemical Oxidation in Acidic Media

Doping Platinum with Germanium: An Effective Way to Mitigate the CO Poisoning

A theoretical study of the improved CO oxidation on WC supported Au monolayer by Cu doping

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Rutile Ti_0.9Ir_0.1O₂‐Supported Low Pt Loading: An Efficient Electrocatalyst for Ethanol Electrochemical Oxidation in Acidic Media

Rutile Ti_0.9Ir_0.1O₂‐Supported Low Pt Loading: An Efficient Electrocatalyst for Ethanol Electrochemical Oxidation in Acidic Media