AuPd/C core–shell and alloy nanoparticles with enhanced catalytic activity toward the electro-oxidation of ethanol in alkaline media

Silva, Lays S.R.; Almeida, Caio V.S.; Meneses, C.T.; Batista, Eduardo Augusto Caldas; Santos, Sydney Ferreira; Eguiluz, Katlin I.B.; Salazar‐Banda, Giancarlo R.

doi:10.1016/j.apcatb.2019.03.067

Cited by 66 publications

(31 citation statements)

References 73 publications

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“…This agrees with those shown in the previous report. [ 45 ] However, the Cu @ Pd 2 catalyst gives a worse catalyst activity (249 mA mg −1 Pd ) than the Pd/C catalyst (Figure S12b, Supporting Information). Therefore, the tensile strain inside the core–shell structured Pd catalyst induces higher EOR activity, while the compressive strain has an opposite effect.…”

Section: Resultsmentioning

confidence: 99%

A Phosphorus‐Doped Ag@Pd Catalyst for Enhanced CC Bond Cleavage during Ethanol Electrooxidation

Yang

Liang

Chen

et al. 2020

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a direct alkaline ethanol fuel cell owns more advantages. [4-6] For example, the production of ethanol from biomass is nonpoisonous and convenient. Ethanol is safe to be stored. More importantly, ethanol can be directly oxidized into CO 2 in an alkaline medium. [7,8] This complete ethanol oxidation reaction (EOR) involves the transfer of 12 electrons (Equation (1)), leading to a much higher energy density (e.g., 6.34 kWh L −1 for ethanol). Unfortunately, this EOR is kinetically sluggish in that the stable CC bond in ethanol molecules has to be broken. Given this fact, ethanol is much easier to be oxidized into acetate rather than CO 2. This oxidation pathway delivers only 4 electrons (Equation (2)). Based on the numbers of carbon atoms in the products and electrons transferred per ethanol molecule, these EOR pathways are termed as C1-12e and C2-4e, respectively. [7-10] In terms of energy density of the EOR, the C2-4e pathway has a three times lower efficiency than that of the C1-12e one. To improve the energy efficiency of direct ethanol fuel cells, advanced electrocatalysts that favor the C1-12e EOR pathway are thus are highly pursued.

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Section: Resultsmentioning

confidence: 99%

A Phosphorus‐Doped Ag@Pd Catalyst for Enhanced CC Bond Cleavage during Ethanol Electrooxidation

Yang

Liang

Chen

et al. 2020

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“…The X‐ray photoelectron spectroscopy (XPS) experiments ( Figure and Figure S14, Supporting Information) show that the Pd 0 , Cu 0 and Pt 0 metal atoms associated with their oxidized states (Pd 2+ , Cu 2+ , and Pt 2+ ) coexist in the near surface of the synthesized Pd‐Cu‐Pt IHs, which means the formation of near‐surface alloy (NSA). Through alloying, the nanoalloys would produce electronical effect (ligand effect and lattice strain effect), resulting in the d‐band center change of single metal atom that can regulate the adsorption energy between metal atoms and adsorbates, then improving the electrocatalytic capacities of nanoalloys . Furthermore, the synergistic effect of the new active sites constructed from neighboring exotic metal atom is another enhanced factor for electrocatalytic reaction .…”

Section: Resultsmentioning

confidence: 99%

“…Recently, the designing multimetallic electrocatalysts for direct polyol fuel cells have been paid extensive attentions due to the increasing shortages of fossil fuels and climate problems . For instance, glycerol has many advantages of its own, such as low toxicity compared with methanol and ethanol, high boiling point (290.9 °C), high solubility in aqueous electrolytes and ease of transportation and storage.…”

Section: Introductionmentioning

confidence: 99%

Ultrasmall Pd‐Cu‐Pt Trimetallic Twin Icosahedrons Boost the Electrocatalytic Performance of Glycerol Oxidation at the Operating Temperature of Fuel Cells

Yang

Yuan

et al. 2020

Adv Funct Materials

111

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Recently, in order to improve the energy conversion efficiency of direct polyol fuel cells, the engineering of effective Pd‐ and/or Pt‐based electrocatalysts to rupture CC bonds has received increasing attention. Here, an example is shown to synthesize highly uniform sub‐10 nm Pd‐Cu‐Pt twin icosahedrons by controlling the nucleation phase. Because of the synergies of the electronic effect, synergistic effect, geometric effect, and abundant surface active sites originating from the formation of near surface alloy and special icosahedral shape, the Pd‐Cu‐Pt twin icosahedrons exhibit excellent electrocatalytic performance in glycerol electrocatalysis at the operating temperature of direct alcohol fuel cells (70 °C) in KOH electrolyte. The Pd50.2Cu38.4Pt11.4 icosahedrons show mass activities of 9.7 A mg−1Pd+Pt and 13.7 A mg−1Pd. Furthermore, the Pd50.2Cu38.4Pt11.4 icosahedrons demonstrate long‐term durability in current–time test for 36 000 s and high in situ anti‐CO poisoning performance. In addition, the introduction of CO can enhance electro‐oxidation endurance on Pd50.2Cu38.4Pt11.4 icosahedrons, and the peak mass activity can reach to 14.4 A mg−1Pd+Pt. The in situ Fourier transform infrared spectroscopy spectra indicate that the Pd50.2Cu38.4Pt11.4 icosahedrons possess a high capacity to break CC bonds and may efficiently convert glycerol into CO2, thus improving the utilization efficiency of energy‐containing molecule glycerol.

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“…These unique features make Pd-based catalysts as important and promising alternatives in boosting EOR activity in alkaline electrolytes. Many metals (such as Ni [46][47][48], Sn [49,50], Ag [51,52], Au [53], Cu, Rh [49], and Ru [32]) or external additives (such as metal oxides [54,55] and hydroxides [56]) have been alloyed or mixed with Pd to form multicomponent systems with optimized catalytic performance and operational durability. Moreover, nanostructure engineering has been adopted to design Pd-based catalysts with enlarged surface areas and abundant active sites.…”

Section: Nanostructure Engineering and Composition Controlmentioning

confidence: 99%

“…Despite the wide-ranging methods employed in synthesizing heterostructured nanocrystals, it is still challenging to control the fine surface morphologies in order to achieve homogeneous and diversified microstructures for advanced catalytic performance. Recently, bimetallic Au@Pd core-shell nanostructures have been carefully designed which show an advanced catalytic performance towards EOR [23,53,57]. For instance, the seed-mediated epitaxial growth method has been employed to synthesize Au@Pd core-shell nanorods via controllable interface engineering ( Figure 3) [23].…”

Section: Nanostructure Engineering and Composition Controlmentioning

confidence: 99%

Advanced Catalytic Materials for Ethanol Oxidation in Direct Ethanol Fuel Cells

et al. 2020

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Direct ethanol fuel cells (DEFCs) have emerged as promising and advanced power systems that can considerably reduce fossil fuel dependence, and thus have attracted worldwide attention. DEFCs have many apparent merits over the analogous devices fed with hydrogen or methanol. As the key constituents, the catalysts for both cathodes and anodes usually face some problems (such as high cost, low conversion efficiency, and inferior durability) that hinder the commercialization of DEFCs. This review mainly focuses on the most recent advances in nanostructured catalysts for anode materials in DEFCS. First, we summarize the effective strategies used to achieve highly active Pt- and Pd-based catalysts for ethanol electro-oxidation, including composition control, microstructure design, and the optimization of support materials. Second, a few non-precious catalysts based on transition metals (such as Fe, Co, and Ni) are introduced. Finally, we outline the concerns and future development of anode catalysts for DEFCs. This review provides a comprehensive understanding of anode catalysts for ethanol oxidation in DEFCs.

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AuPd/C core–shell and alloy nanoparticles with enhanced catalytic activity toward the electro-oxidation of ethanol in alkaline media

Cited by 66 publications

References 73 publications

A Phosphorus‐Doped Ag@Pd Catalyst for Enhanced CC Bond Cleavage during Ethanol Electrooxidation

A Phosphorus‐Doped Ag@Pd Catalyst for Enhanced CC Bond Cleavage during Ethanol Electrooxidation

Ultrasmall Pd‐Cu‐Pt Trimetallic Twin Icosahedrons Boost the Electrocatalytic Performance of Glycerol Oxidation at the Operating Temperature of Fuel Cells

Advanced Catalytic Materials for Ethanol Oxidation in Direct Ethanol Fuel Cells

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