Synthesis of Pt+SnO2/C electrocatalysts containing Pt nanoparticles with preferential (100) orientation for direct ethanol fuel cell

Antoniassi, Rodolfo M.; Silva, Júlio César M.; Neto, Almir Oliveira; Spinacé, Estevam V.

doi:10.1016/j.apcatb.2017.06.031

Cited by 52 publications

(47 citation statements)

References 37 publications

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“…Whereas only the synthesis of monometallic high‐index facets NPs has been reported by using electrochemical methods, by the use of chemical methods have been reported also the synthesis of not only high‐index but also low‐index monometallic, bimetallic and trimetallic NPs, such as cubic, octahedral and rhombic dodecahedral NPs with predominantly {100}, {111} and {110} facets, respectively …”

Section: Shape‐controlled Metal Nanoparticles For the Eormentioning

confidence: 99%

“…Whereas only the synthesis of monometallic high-index facets NPs has been reported by using electrochemical methods, by the use of chemical methods have been reported also the synthesis of not only high-index but also low-index monometallic, bimetallic and trimetallic NPs, such as cubic, octahedral and rhombic dodecahedral NPs with predominantly {100}, {111} and {110} facets, respectively. [49][50][51][52][53][54][55][56][57][58][59] Regarding monometallic catalysts, Feliu and coworkers studied the ethanol oxidation in acid media on different shapecontrolled platinum nanoparticles: (100) and (111) predominantly oriented Pt nanoparticles with a preferential cubic and octahedron shape, respectively. [50] FTIRS and DEMS studies demonstrated that the CÀ C bond breaking was more favored on cubic Pt NPs (2B in Scheme 1), in agreement with the aforementioned results with Pt single crystals.…”

Section: Chemical Synthesismentioning

confidence: 99%

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Well‐Defined Platinum Surfaces for the Ethanol Oxidation Reaction

2019

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Direct ethanol fuel cells are a promising technology for clean energy production. The ethanol oxidation reaction (EOR) is surface sensitive and, hence, the study of single‐crystal electrodes provides fundamental knowledge of the different activity of the metal crystal planes. However, for practical applications, metal nanoparticles dispersed on a porous support are generally used to enhance the efficiency and to reduce the catalyst cost. Although some research has been devoted to the development of shape‐controlled nanoparticles, the finding of an efficient, cost‐effective, and easily scaled‐up catalytic system remains a challenge. Furthermore, the use of a suitable support with a well‐defined nanoarchitecture is essential for the control of the catalyst reactivity. In this Review, a general overview of the performance of single‐crystal electrodes and unsupported/supported shape‐controlled nanoparticles for the EOR is presented, paying special attention to Pt surfaces. Finally, the major challenges and directions for future research are also discussed to guide the design of efficient shape‐controlled catalysts for the EOR.

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Section: Shape‐controlled Metal Nanoparticles For the Eormentioning

confidence: 99%

Section: Chemical Synthesismentioning

confidence: 99%

Well‐Defined Platinum Surfaces for the Ethanol Oxidation Reaction

2019

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“…On the other hand, in presence of sulfuric acid, the catalysts showed the opposite tendency. It is noteworthy that the open circuit potential values obtained for all catalysts and in both conditions were higher than that presented by pure platinum (0.5 V) [16,52].Moreover, they were similar to those exhibited by binary PtRu/C catalysts (0.7 V) [19,53,54], but lower than those shown by PtSn/C binaries (0.8 V) [19,53]. The power densities were also higher compared to pure platinum (7-10 mW cm −2 ) [16,53] catalysts, as well as PtRu/C (8-30 W g −1 Pt) [19,52] and PtSnRu/C (17 W g −1 Pt) [52] ternary catalysts.…”

Section: Electrochemical Characterizationmentioning

confidence: 60%

“…Studies have shown that the PtSn/C catalyst presents excellent electrocatalytic activity in relation to ethanol oxidation [16][17][18]. The addition of Ru into PtSn/C catalysts has been also studied for alcohol oxidation [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Catalysts of PtSn/C Modified with Ru and Ta for Electrooxidation of Ethanol

Queiroz

Ribeiro

2019

Catalysts

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PtSn/C-type catalysts modified with Ta and Ru were prepared by the thermal decomposition of polymeric precursors with the following nominal compositions: Pt70Sn10Ta20/C, Pt70Sn10Ta15Ru5/C, Pt70Sn10Ta10Ru10/C and Pt70Sn10Ta5Ru15/C. The physicochemical characterization was performed by X-ray diffraction (XRD) and energy dispersive X-ray (EDX). The electrochemical characterization was performed using cyclic voltammetry, chronoamperometry and fuel cell testing. PtSnTaRu/C catalysts were characterized in the absence and presence of ethanol in an acidic medium (H2SO4 0.5 mol L−1). All the catalysts showed activity for the oxidation of ethanol. The results indicated that the addition of Ta increased the stability and performance of the catalysts, as the Pt70Sn10Ta20/C catalyst had the maximum power density of 27.3 mW cm−2 in an acidic medium. The results showed that the PtSn/C-type catalysts modified with Ta and Ru showed good performance against alcohol oxidation, representingan alternative to the use of direct ethanol fuel cells.

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“…Alloying Pt or Pd with 3d transition metals provides a straightforward way to alter the electronic structure and optimize the binding energies of adsorbates on the catalyst surface 15–25. Creating synergistic catalysts via a combination of noble metals with oxophilic metal oxides/hydroxides proved a promising approach for improving the durability 26–34. In a rational catalyst design, the OH adspecies on the surface of oxides/hydroxides will facilitate the oxidative removal of carbonaceous intermediates adsorbed on the nearby Pd or Pt sites.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical Nanostructured Pd/Co₃N‐Ni₃N as an Efficient Catalyst for Ethanol Electrooxidation in Alkaline Media

Tang

Gao

et al. 2020

Adv Materials Inter

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to synthesize multicomponent and/or nanocomposite catalysts. Alloying Pt or Pd with 3d transition metals provides a straightforward way to alter the electronic structure and optimize the binding energies of adsorbates on the catalyst surface. [15][16][17][18][19][20][21][22][23][24][25] Creating synergistic catalysts via a combination of noble metals with oxophilic metal oxides/hydroxides proved a promising approach for improving the durability. [26][27][28][29][30][31][32][33][34] In a rational catalyst design, the OH adspecies on the surface of oxides/ hydroxides will facilitate the oxidative removal of carbonaceous intermediates adsorbed on the nearby Pd or Pt sites.Recently, the search for synergistic phases was further extended to transition metal non-oxides, like phosphides, [35][36][37][38] sulfides, [39] carbides, [40,41] and nitrides. [42][43][44][45][46] In comparison with the corresponding oxides, metal non-oxides exhibit much more abundant physicochemical properties owing to the complex and tunable interactions between metals and non-oxygen elements. For instance, in contrast to the insulator nature of most oxides, transition metal non-oxides span a remarkable range of conductivity properties, from insulator to semiconductor and to metal. Evidently, a rich variety of metal non-oxides with diverse properties offers increased degrees of freedom in the design of synergestic catalysts for the EOR. Among the materials of choice, transition metal nitrides (TMNs) are highly appealing but less well explored candidates. Theoretical studies found that TMNs (like Ni 3 N) typically show moderate binding energies of OH species, implying a compromise between the activation of OH and poisoning of the surface with reaction intermediates. [47] This, together with their high electrical conductivity and good chemical stability, clearly suggests the potential of TMN as a component phase in the synergistic catalysis of EOR. [48,49] Herein, we report the synthesis of a carbon fiber clothsupported nanocomposite catalyst consisting of highly dispersed Pd nanoparticles on the porous Co 3 N-Ni 3 N nanowires using a hydrothermal method followed by ammonization treatment and electrochemical deposition. Our study found that incorporation of Co 3 N-Ni 3 N of metallic nature could effectively improve the poisoning tolerance, while preserving good electrical conductivity of the electrocatalyst. Furthermore, the resulting hierarchical nanostructure of Co 3 N-Ni 3 N from the applied synthesis methods ensures the exposure of abundant active sites and a favorable reactant/product mass transfer kinetics. As a consequence, the Pd/Co 3 N-Ni 3 N/CFC catalyst Creating synergistic active sites via combination of palladium (Pd) or platinum (Pt) with oxophilic metal compounds has been extensively investigated as a promising approach for developing active and robust electrocatalysts toward the ethanol oxidation reaction (EOR). Among the metal compounds of choice, transition metal nitrides are highly appealing but less well explored candidates. H...

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Synthesis of Pt+SnO2/C electrocatalysts containing Pt nanoparticles with preferential (100) orientation for direct ethanol fuel cell

Cited by 52 publications

References 37 publications

Well‐Defined Platinum Surfaces for the Ethanol Oxidation Reaction

Well‐Defined Platinum Surfaces for the Ethanol Oxidation Reaction

Catalysts of PtSn/C Modified with Ru and Ta for Electrooxidation of Ethanol

Hierarchical Nanostructured Pd/Co₃N‐Ni₃N as an Efficient Catalyst for Ethanol Electrooxidation in Alkaline Media

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Synthesis of Pt+SnO2/C electrocatalysts containing Pt nanoparticles with preferential (100) orientation for direct ethanol fuel cell

Cited by 52 publications

References 37 publications

Well‐Defined Platinum Surfaces for the Ethanol Oxidation Reaction

Well‐Defined Platinum Surfaces for the Ethanol Oxidation Reaction

Catalysts of PtSn/C Modified with Ru and Ta for Electrooxidation of Ethanol

Hierarchical Nanostructured Pd/Co3N‐Ni3N as an Efficient Catalyst for Ethanol Electrooxidation in Alkaline Media

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Hierarchical Nanostructured Pd/Co₃N‐Ni₃N as an Efficient Catalyst for Ethanol Electrooxidation in Alkaline Media