Nanobranched porous palladium–tin intermetallics: One-step synthesis and their superior electrocatalysis towards formic acid oxidation

Sun, Dandan; Si, Lina; Fu, Gengtao; Liu, Chang; Sun, Dongmei; Chen, Yu; Tang, Yawen; Lu, Tianhong

doi:10.1016/j.jpowsour.2015.01.100

Cited by 63 publications

(47 citation statements)

References 57 publications

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“…4A displays the XPS survey spectra for the PdSn/MWCNT and Pd/MWCNT samples. 21,38 Moreover, the Pd 3d spectrum of the PdSn/MWCNT catalyst (Fig. 3,35,37 It is noted that the Sn 3d (486.4 eV) signal is only observed in the spectrum for PdSn/ MWCNT, a nding that supports the conclusion that the PdSn/MWCNT catalyst was successfully prepared.…”

Section: Resultsmentioning

confidence: 63%

“…Tu et al also reported the synthesis of a carbonsupported PdSn (PdSn/C) catalyst by a chemical reduction method with the aid of microwave radiation, this catalyst exhibited enhanced electrocatalytic performance for FAO. 21 However, the PdSn catalysts described above were generally prepared in aqueous or ethylene glycol solutions, and the electrochemical performance of PdSn catalysts needs further enhancement. 21 However, the PdSn catalysts described above were generally prepared in aqueous or ethylene glycol solutions, and the electrochemical performance of PdSn catalysts needs further enhancement.…”

Section: Introductionmentioning

confidence: 99%

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PdSn nanocatalysts supported on carbon nanotubes synthesized in deep eutectic solvents with high activity for formic acid electrooxidation

et al. 2016

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Deep eutectic solvents (DESs) are being increasingly used in electrochemically controllable synthesis of functional nanomaterials because of their unique merits (e.g., high conductivity, wide electrochemical windows and environmental friendship). Herein, we report a novel strategy in DESs for the fabrication of multi-walled carbon nanotubes (MWCNTs)-supported Pd-based alloy nanostructures. Using a NaBH 4 solvothermal reduction process in DESs, highly active PdSn alloy nanocatalysts supported on MWCNTs towards the formic acid oxidation (FAO) reaction were synthesized for the first time. The as-synthesized materials were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive X-ray (EDX) spectroscopy, X-ray photoelectron spectroscopy (XPS) and electrochemical tests.The results demonstrate that the PdSn nanocluster structure with a rough surface provides a high density of catalytically active sites and thereby increases the electrochemically active surface area. There is a strong charge transfer interaction between Pd and Sn in the PdSn/MWCNT catalyst due to its high degree of alloying. The electrochemical studies indicate that the PdSn/MWCNT shows remarkably improved electrocatalytic performance towards FAO compared to Pd/MWCNT and commercial Pd/C catalysts. This study suggests an effective synthesis strategy for Pd-based electrocatalysts with high performance for DFAFCs applications.

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Section: Resultsmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 99%

PdSn nanocatalysts supported on carbon nanotubes synthesized in deep eutectic solvents with high activity for formic acid electrooxidation

et al. 2016

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“…Strategies centered on alloying to remove CO ads generated by the indirect pathway have been described previously. 6,[12][13][14][15][16][17][18] The addition of adatoms to the catalyst surface, like Bi or Sb, has been shown to improve formic acid electro-oxidation activity at low overpotentials by so-called ensemble or third-body effects. 4,5,[19][20][21][22][23][24][25] Coupled in situ surface-enhanced infrared spectroscopy and first-principles density functional theory (DFT) calculations indicate that the addition of adatoms can influence the configuration of the formic acid molecule at the catalyst surface.…”

Section: Introductionmentioning

confidence: 99%

Supportless, Bismuth-Modified Palladium Nanotubes with Improved Activity and Stability for Formic Acid Oxidation

et al. 2015

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Palladium nanotubes (PdNTs) were synthesized by templated vapor deposition and investigated for formic acid electrooxidation. Annealed PdNTs are 2.4 times more active (2.19 mA/cm 2 ) than commercial carbon-supported palladium (0.91 mA/cm 2 ) at 0.3 V vs.RHE. Bismuth modification improved nanotube performance over 4 times (3.75 mA/cm 2 ) vs. Pd/C and nearly 2 times vs. unmodified PdNTs. A surface Bi coverage of 80% results in optimal site-specific activity by drastically reducing surface-poisoning CO generation during formic acid electrooxidation. The Bi-modified PdNTs are exceptionally stable, maintaining 2 times the area-normalized current density as Pd/C after 24 hours at 0.2 V vs. RHE. We attribute the enhanced activity and stability of the nanotube catalysts to the presence of highly coordinated surfaces, mimicking a flat polycrystal while retaining high surface area geometry.

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“…In previous investigations, nanocrystals of Pd 2 Sn and PdSn were synthesized by a modified polyol process with NaBH 4 as reducing agent. Pd 3 Sn 2 nanoparticles could be obtained by Sun et al without using an additional reducing agent in EG under solvothermal conditions …”

Section: Resultsmentioning

confidence: 99%

“…Therefore, an unmodified polyol process for the synthesis of intermetallic nanoparticles would be desirable. This has already been achieved for a few compounds, for example, Pd 3 Sn 2 , Pd 3 Pb, PtBi 2 , and PtBi , …”

Section: Introductionmentioning

confidence: 84%

Refinement of the Microwave‐Assisted Polyol Process for the Low‐Temperature Synthesis of Intermetallic Nanoparticles

et al. 2017

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The microwave-assisted polyol process was applied to synthesize phase-pure micro- or nanocrystalline intermetallic phases in the systems T-M (T = Co, Ni, Rh, Pd, Ir, Pt and M = Sn, Sb, Pb, Bi). Reaction temperatures range between 240 and 300 degrees C, and reaction times of a few minutes up to 1 h are sufficient. For optimization of the syntheses, the reaction temperature, reaction time, and metal precursors were changed. To obtain phase-pure samples the process was further modified by the addition of potassium hydroxide, oleylamine, or oleic acid. Single-phase powders of a variety of intermetallic compounds were synthesized. Although not stable at the temperature of synthesis, high-temperature phases are accessible as well. The microwave-assisted polyol process opens up the possibility to synthesize intermetallic compounds through a fast and easily applicable one-step route, without utilization of strong and often toxic reducing agents

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Nanobranched porous palladium–tin intermetallics: One-step synthesis and their superior electrocatalysis towards formic acid oxidation

Cited by 63 publications

References 57 publications

PdSn nanocatalysts supported on carbon nanotubes synthesized in deep eutectic solvents with high activity for formic acid electrooxidation

PdSn nanocatalysts supported on carbon nanotubes synthesized in deep eutectic solvents with high activity for formic acid electrooxidation

Supportless, Bismuth-Modified Palladium Nanotubes with Improved Activity and Stability for Formic Acid Oxidation

Refinement of the Microwave‐Assisted Polyol Process for the Low‐Temperature Synthesis of Intermetallic Nanoparticles

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