The influence of the crystal structure of TiO2 support material on Pd catalysts for formic acid electrooxidation

Wang, Xiaoming; Xia, Yongyao

doi:10.1016/j.electacta.2009.09.037

Cited by 32 publications

(6 citation statements)

References 53 publications

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“…The forward peak current on the commercial 30 wt % Pd/C(Aldrich) catalyst is 722 mA·mg –1 , similar to the previous report in the literature . The mass activity of the TiO 2 (001)@Pd(111) catalyst is 5.8 times that of the impregnated Pd/TiO 2 (001) catalyst (1121 vs 194 mA·mg –1 ), which is much higher than other TiO 2 -supported palladium catalysts reported in the literature. − It should be noted that our TiO 2 (001)@Pd(111) catalyst also exhibits 1.5 times the mass activity as that on a commercial Pd/C catalyst with similar palladium loading. Moreover, the forward peak potential of the TiO 2 (001)@Pd(111) catalyst is situated at 0.20 V (marked with vertical dashed lines in Figure ), ∼20 mV more negative compared to the commercial Pd/C catalyst, indicating that the TiO 2 (001)@Pd(111) catalyst has faster kinetics than the commercial Pd/C catalyst.…”

Section: Resultssupporting

confidence: 85%

Facile Synthesis of the TiO₂-Supported Ultrathin Palladium Facet Composite Catalyst with Superior Metal Dispersion and Enhanced Catalytic Performance in Formic Acid Electro-Oxidation

Chen,

Gao,

et al. 2023

J. Phys. Chem. C

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Supported metal catalysts are widely applied in electrocatalysis and heterogeneous catalysis. However, the agglomeration and/or sintering of metal nanoparticles is still a big problem, which usually causes the deactivation of these catalysts. Moreover, the inhomogeneity of the exposed facets of metal nanoparticles hinders the establishment of the structure–activity relationship of catalysts. Thus, it is crucial to develop new strategies to prepare supported metal catalysts with exposed specific metal facets that remarkably decrease the agglomeration of metal nanoparticles and achieve superior metal dispersion, especially in situations of high metal loading. In this manuscript, an ultrathin palladium layer exposed to a Pd{111} facet with an average thickness of 0.9 nm is grown on {001}-faceted anatase TiO2 nanosheets to form the TiO2(001)@Pd(111) facet composite catalyst by precise control of the reduction of palladium precursors in the presence of CO at ambient temperature under mild conditions. On one hand, well-dispersed ultrathin Pd metal with a high metal loading of ∼31 wt % is achieved, which leads to a much larger active surface area and improved atom utilization efficiency as compared to the supported Pd nanoparticle catalyst, Pd/TiO2(001), prepared by the conventional impregnation method. On the other hand, the maximized interface contact between the ultrathin Pd layer and the TiO2 nanosheet improves the stability of the ultrathin palladium layer and downshifts the Pd d-band center. Therefore, the TiO2(001)@Pd(111) catalyst shows much higher activity, stability, and CO tolerance as compared to Pd/TiO2(001) and commercial Pd/C(Aldrich) catalysts with similar palladium loadings in the formic acid electro-oxidation reaction. This work opens up an effective strategy to synthesize highly stable and active supported ultrathin metal catalysts with exposed specific facets, which also sheds light on enhancing the stability and activity of Pd anodic catalysts in formic acid electro-oxidation.

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Section: Resultssupporting

confidence: 85%

Facile Synthesis of the TiO₂-Supported Ultrathin Palladium Facet Composite Catalyst with Superior Metal Dispersion and Enhanced Catalytic Performance in Formic Acid Electro-Oxidation

Chen,

Gao,

et al. 2023

J. Phys. Chem. C

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“…For instance, the high operational potentials limit the use of carbon based support materials in SPEWEs, the most common material support used in fuel cells, because degradation and loss of electrical contact with the electroactive material is typically observed. Therefore, the catalyst support materials should possess several important features: (i) a highly superficial surface to allow for good dispersion of the catalyst nanoparticles, (ii) a high electrical conductivity to allow for efficient transport of electrons to the ions involved in the electrochemical reactions, (iii) mechanical and chemical stability, and (iv) a good metal support interaction to improve the intrinsic catalytic activity of the catalyst phase [13,14]. The support materials that have been studied for OER are based on oxides and other ceramics, which include Ti n O 2n-1 [14], TiC, SiC-Si, SnO 2 [15,16] and Sb-SnO 2 [5].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical study of Ir–Sn–Sb–O materials as catalyst-supports for the oxygen evolution reaction

et al. 2015

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A novel material, with a general formula of IrSn-Sb-O, was synthesized for use in solid polymer electrolyte water electrolyzers (SPEWEs) by the thermal decomposition of the chloride precursors H 2 IrCl 6 , SnCl 4 Á5H 2 O, and SbCl 3 in ethanol. The material functions simultaneously as an electrocatalyst and support for the oxygen evolution reaction (OER). Two different H 2 IrCl 6 proportions in the reaction mixture were tested to observe the effect of this proportion on the electrocatalytic activity and composition of the materials. Physicochemical properties of Ir-Sn-S-O were characterized by X-ray diffraction, scanning electron microscopy. The electrochemical properties of the materials studied were measured using cyclic voltammetry, linear scan voltammetry, and electrochemical impedance spectroscopy. Mechanical mixtures of IrO 2 with Vulcan carbon or antimony doped tin oxide were also tested with respect to the OER to compare the properties of Ir-Sn-Sb-O. The results indicate that the catalyst-support materials presented nanometric sizes (1-2 nm) and electrocatalytic properties similar to IrO 2 supported on Vulcan carbon but with higher stability toward the oxygen evolution reaction. The synthesized mixed oxides could be a suitable anode material in SPEWEs.

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“…The enhanced catalytic property of Pd/CMRT mainly arised from the improved electronic conductivity of the carbon-modified rutile TiO2, the dilated lattice constant of Pd nanoparticles, an increasing of surface steps and kinks in the microstructure of Pd nanoparticles and slightly better tolerance to the adsorption of poisonous intermediates [107]. Wang et al [108] investigated the influence of the crystal structure of TiO2 supporting material on formic acid oxidation. TiO2 with the rutile structure improved the catalytic activity of Pd nanoparticles toward formic acid oxidation.…”

Section: Pd Supported On Oxidesmentioning

confidence: 99%

Recent Development of Pd-Based Electrocatalysts for Proton Exchange Membrane Fuel Cells

2015

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This review selectively summarizes the latest developments in the Pd-based cataysts for low temperature proton exchange membrane fuel cells, especially in the application of formic acid oxidation, alcohol oxidation and oxygen reduction reaction. The advantages and shortcomings of the Pd-based catalysts for electrocatalysis are analyzed. The influence of the structure and morphology of the Pd materials on the performance of the Pd-based catalysts were described. Finally, the perspectives of future trends on Pd-based catalysts for different applications were considered.

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The influence of the crystal structure of TiO2 support material on Pd catalysts for formic acid electrooxidation

Cited by 32 publications

References 53 publications

Facile Synthesis of the TiO₂-Supported Ultrathin Palladium Facet Composite Catalyst with Superior Metal Dispersion and Enhanced Catalytic Performance in Formic Acid Electro-Oxidation

Facile Synthesis of the TiO₂-Supported Ultrathin Palladium Facet Composite Catalyst with Superior Metal Dispersion and Enhanced Catalytic Performance in Formic Acid Electro-Oxidation

Electrochemical study of Ir–Sn–Sb–O materials as catalyst-supports for the oxygen evolution reaction

Recent Development of Pd-Based Electrocatalysts for Proton Exchange Membrane Fuel Cells

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The influence of the crystal structure of TiO2 support material on Pd catalysts for formic acid electrooxidation

Cited by 32 publications

References 53 publications

Facile Synthesis of the TiO2-Supported Ultrathin Palladium Facet Composite Catalyst with Superior Metal Dispersion and Enhanced Catalytic Performance in Formic Acid Electro-Oxidation

Facile Synthesis of the TiO2-Supported Ultrathin Palladium Facet Composite Catalyst with Superior Metal Dispersion and Enhanced Catalytic Performance in Formic Acid Electro-Oxidation

Electrochemical study of Ir–Sn–Sb–O materials as catalyst-supports for the oxygen evolution reaction

Recent Development of Pd-Based Electrocatalysts for Proton Exchange Membrane Fuel Cells

Contact Info

Product

Resources

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Facile Synthesis of the TiO₂-Supported Ultrathin Palladium Facet Composite Catalyst with Superior Metal Dispersion and Enhanced Catalytic Performance in Formic Acid Electro-Oxidation

Facile Synthesis of the TiO₂-Supported Ultrathin Palladium Facet Composite Catalyst with Superior Metal Dispersion and Enhanced Catalytic Performance in Formic Acid Electro-Oxidation