Ultra-uniform PdBi nanodots with high activity towards formic acid oxidation

Xu, Hui; Zhang, Ke; Yan, Bo; Wang, Jin; Wang, Caiqin; Li, Shumin; Gu, Zhulan; Du, Yu Kou; Yang, Ping

doi:10.1016/j.jpowsour.2017.04.070

Cited by 153 publications

(76 citation statements)

References 54 publications

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“…To further confirm their crystalline structure, powder X-ray diffraction (PXRD) was also performed. [15] To uncovert he formation mechanism of the 3D PtAg "nuts", as eries of controlled experiments regarding the reaction parameters were conducted. The composition ratio of Pt/Ag is around5 0.7/49.3, as revealed by the TEM-EDS (EDS:e nergy-dispersive X-ray spectroscopy;F igure1E), which is consistent with the resultsf rom inductively coupled plasma atomic emission spectroscopy (ICP-AES).…”

Section: Resultsmentioning

confidence: 99%

Pt Islands on 3 D Nut‐like PtAg Nanocrystals for Efficient Formic Acid Oxidation Electrocatalysis

Song

Yan

et al. 2018

ChemSusChem

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Precise control of structures offers a great opportunity to efficiently tune the catalytic performance of nanomaterials, enhacing both their activity and durability. Herein, we achieve a new class of Pt islands on 3 D nut-like PtAg nanocrystals by exploiting the lower electronegativity of Ag in conjunction with the galvanic replacement of catalytically active Pt to Ag. Such nanostructures coated with Pt nanoparticles, exhibiting exposed facets, and active surface composition enhance formic acid oxidation electrocatalysis with optimized PtAg nut-like catalysts and achieved a factor of 4.0 and 2.4 in mass and specific activities (1728.3 mA mg and 3.31 mA cm ) relative to those of the commercial Pt/C (431.2 mA mg and 1.41 mA cm ), respectively. Moreover, such 3 D PtAg nut-like catalysts also display great enhancement in durability with less decay for at last 500 cycles, showing a great potential to serve as promising catalysts for fuel cells and other applications. Our work provides a fundamental insight on the effect of the morphology toward liquid fuel electrooxidation, which may pave a new way for the fabrication of highly efficient electrocatalysts for fuel cells.

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Section: Resultsmentioning

confidence: 99%

Pt Islands on 3 D Nut‐like PtAg Nanocrystals for Efficient Formic Acid Oxidation Electrocatalysis

Song

Yan

et al. 2018

ChemSusChem

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“…Incorporation of other metals or oxides with Pd, such as Pt, Pb, Au, Ir, HoO x , or WO 2.72 , has been considered as an effective strategy to improve the activity and stability of Pd‐based catalysts. For instance, Du and co‐workers demonstrated that a well‐prepared ultrauniform and small PdBi nanodots had a high FAO activity compared to that of commercial Pd/C . More recently, Sun and co‐workers reported that Cu in a CuPd alloy could be better stabilized by strong interfacial interactions between CuPd particles and WO 2.72 ; and the stabilized CuPd exhibited significantly improved catalytic ability for the FAO …”

Section: Methodsmentioning

confidence: 99%

Facile Synthesis of Porous Pd₃Pt Half‐Shells with Rich “Active Sites” as Efficient Catalysts for Formic Acid Oxidation

Yan

et al. 2018

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Exploring highly efficient electrocatalysts is greatly important for the widespread uptake of the fuel cells. However, many newly generated nanocrystals with attractive nanostructures often have extremely limited surface area or large particle-size, which leads them to display limited electrocatalytic performance. Herein, a novel anode catalyst of hollow and porous Pd Pt half-shells with rich "active sites" is synthesized by using urea as a guiding surfactant. It is identified that the formation of Pd Pt half-shells involves the combination of bubble guiding, in situ deposition of particles and bubble burst. The obtained Pd Pt half-shells demonstrate a rich edge area with abundant exposed active sites and surface defects, indicating great potential for the electrocatalysis. When used as an electrocatalyst, the Pd Pt half-shells exhibit remarkably improved electrocatalytic performance for formic acid oxidation (FAO), where it promotes the dehydrogenation process of FAO by suppressing the formation of poisonous species CO via the electronic effect and ensemble effect.

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“…Furthermore, we have also employed the energy‐dispersive X‐ray spectroscopy (EDX) analyses mapping to clearly distinguish the elemental distributions of Pt and Cu in the pentangles, where both Pt and Cu are spreading over the whole pentangle homogeneously, as revealed by line‐scan (Figure e). From the Figure f, the Pt/Cu composition determined EDX analysis is 74.1/25.9 (Figure f), which is consistent with the result determined by inductively coupled plasma atomic emission spectroscopy (ICP‐AES), indicating the complete reduction of precursors …”

Section: Figurementioning

confidence: 99%

“…From the Figure 1f,t he Pt/Cu composition determined EDX analysis is 74.1/25.9 (Figure 1f), which is consistent with the result determined by inductively coupledp lasma atomic emission spectroscopy (ICP-AES), indicating the complete reduction of precursors. [17] Apart from these, X-ray photoelectron spectroscopy (XPS) has also been conducted for analyzing the surface compositions and valence states of the pentangle-like Pt 3 Cu NCs. As it can be seen in FigureS3a,t he Pt 4f XPS spectrum recorded from Pt 3 Cu NCs illustrates that the predominated product for surfaceP ti si nm etallics tate, the other two well-defined peaks located att he bindinge nergy (B.E.)…”

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Ethylene Glycol Electrooxidation Based on Pentangle‐Like PtCu Nanocatalysts

Liu

Song

et al. 2018

Chemistry An Asian Journal

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The research of active and stable electrocatalysts toward liquid-fuel oxidation reaction is of great significance for the large-scale commercialization of fuel cells. Although extensive efforts have been devoted to pursuing high-performance nanocatalysts for fuel cells, both the high cost and sluggish reaction kinetics have been two major drawbacks that limited its commercial development. In this regard, we demonstrated a facile solvothermal method for the syntheses of an advanced class of PtCu nanocatalysts with a unique pentangle-like shape. By combining the merits of a highly active surface area as well as the synergistic and electronic effects, the as-prepared pentangle-like Pt Cu nanocatalysts showed superior electrocatalytic activity towards ethylene glycol oxidation with a mass and specific activities of 5162.6 mA mg and 9.7 mA cm , approximately 5.0 and 5.1 times higher than the commercial Pt/C, respectively. More significantly, the Pt Cu pentangle also showed excellent long-term stability with less activity decay and negligible changes in structure after 500 cycles, indicating another class of anode catalysts for fuel cells and beyond.

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Ultra-uniform PdBi nanodots with high activity towards formic acid oxidation

Cited by 153 publications

References 54 publications

Pt Islands on 3 D Nut‐like PtAg Nanocrystals for Efficient Formic Acid Oxidation Electrocatalysis

Pt Islands on 3 D Nut‐like PtAg Nanocrystals for Efficient Formic Acid Oxidation Electrocatalysis

Facile Synthesis of Porous Pd₃Pt Half‐Shells with Rich “Active Sites” as Efficient Catalysts for Formic Acid Oxidation

Ethylene Glycol Electrooxidation Based on Pentangle‐Like PtCu Nanocatalysts

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Ultra-uniform PdBi nanodots with high activity towards formic acid oxidation

Cited by 153 publications

References 54 publications

Pt Islands on 3 D Nut‐like PtAg Nanocrystals for Efficient Formic Acid Oxidation Electrocatalysis

Pt Islands on 3 D Nut‐like PtAg Nanocrystals for Efficient Formic Acid Oxidation Electrocatalysis

Facile Synthesis of Porous Pd3Pt Half‐Shells with Rich “Active Sites” as Efficient Catalysts for Formic Acid Oxidation

Ethylene Glycol Electrooxidation Based on Pentangle‐Like PtCu Nanocatalysts

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Facile Synthesis of Porous Pd₃Pt Half‐Shells with Rich “Active Sites” as Efficient Catalysts for Formic Acid Oxidation