Ultrathin PdAg single-crystalline nanowires enhance ethanol oxidation electrocatalysis

Lv, Hao; Wang, Yan; Lopes, Aaron; Xu, Dongdong; Liu, Ben

doi:10.1016/j.apcatb.2019.02.068

Cited by 138 publications

(108 citation statements)

References 45 publications

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“…Its individual peaks are located between those of pure Pd and pure Ag, but are relatively closer to Pd, evidencing the formation of a Pd‐rich alloy according to the Vegard's law. [ 42 ] Through the transmission electron microscopy (TEM) (Figure 1b) and scanning transmission electron microscopy (STEM) (Figure 1c,d), Pd 4 Ag is unveiled to comprise predominantly 1D nanowires (having an average diameter of 5–6 nm and a length of several hundred nanometers), together with a small fraction of nanoparticles. These nanowires are often curved, and some of them appear to be bundled or even melted together.…”

Section: Figurementioning

confidence: 99%

Alloyed Palladium–Silver Nanowires Enabling Ultrastable Carbon Dioxide Reduction to Formate

et al. 2020

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Palladium can enable the electrochemical CO2 reduction to formate with nearly zero overpotential and good selectivity. However, it usually has very limited stability owing to CO poisoning from the side reaction intermediate. Herein, it is demonstrated that alloying palladium with silver is a viable strategy to significantly enhance the electrocatalytic stability. Palladium–silver alloy nanowires are prepared in aqueous solution with tunable chemical compositions, large aspect ratio, and roughened surfaces. Thanks to the unique synergy between palladium and silver, these nanowires exhibit outstanding electrocatalytic performances for selective formate production. Most remarkably, impressive long‐term stability is measured even at < ‐0.4 V versus reversible hydrogen electrode where people previously believed that formate cannot be stably formed on palladium. Such stability results from the enhanced CO tolerance and selective stabilization of key reaction intermediates on alloy nanowires as supported by detailed electrochemical characterizations and theoretical computations.

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Section: Figurementioning

confidence: 99%

Alloyed Palladium–Silver Nanowires Enabling Ultrastable Carbon Dioxide Reduction to Formate

et al. 2020

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“…The galvanic replacement reaction between Ag NWs and Pt(CH 3 COO) 2 or Pd(NO) 2 was also performed and resulted in Pt NTs or Pd NTs (Figure j) with a rough morphology, respectively . Interestingly, when the length of Ag NWs was increased to 20 µm, only some segments of the NWs were converted into hollow structures (Figure k) due to the hydrolysis of Pd 2+ before the reaction completed . In addition, by introducing a reductant (such as ascorbic acid), Ag NWs were controllably modified with a small amount of Pd (5 at%), leading to excellent chemical stability against oxidation …”

Section: G Ag Nws and The Derived Nanostructuresmentioning

confidence: 99%

Nanowire Genome: A Magic Toolbox for 1D Nanostructures

Yang

Liang

et al. 2019

Advanced Materials

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1D nanomaterials with high aspect ratio, i.e., nanowires and nanotubes, have inspired considerable research interest thanks to the fact that exotic physical and chemical properties emerge as their diameters approach or fall into certain length scales, such as the wavelength of light, the mean free path of phonons, the exciton Bohr radius, the critical size of magnetic domains, and the exciton diffusion length. On the basis of their components, aspect ratio, and properties, there may be imperceptible connections among hundreds of nanowires prepared by different strategies. Inspired by the heredity system in life, a new concept termed the “nanowire genome” is introduced here to clarify the relationships between hundreds of nanowires reported previously. As such, this approach will not only improve the tools incorporating the prior nanowires but also help to precisely synthesize new nanowires and even assist in the prediction on the properties of nanowires. Although the road from start‐ups to maturity is long and fraught with challenges, the genetical syntheses of more than 200 kinds of nanostructures stemming from three mother nanowires (Te, Ag, and Cu) are summarized here to demonstrate the nanowire genome as a versatile toolbox. A summary and outlook on future challenges in this field are also presented.

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“…Furthermore, the use of 1D Pt and Pd nanomaterials, alloyed or decorated with Au, has shown significant catalytic activity owing to their synergistic effects and large surface areas [18,[25][26][27][28][29][30][31]. To this end, ultrathin nanowires (NWs) have become widely used in fuel cells, offering remarkable catalytic performances [32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

One Dimensional AuAg Nanostructures as Anodic Catalysts in the Ethylene Glycol Oxidation

et al. 2020

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Direct alcohol fuel cells are highly promising as efficient power sources for various mobile and portable applications. However, for the further advancement of fuel cell technology it is necessary to develop new, cost-effective Pt-free electrocatalysts that could provide efficient alcohol oxidation and also resist cross-over poisoning. Here, we report new electrocatalytic materials for ethylene glycol oxidation, which are based on AuAg linear nanostructures. We demonstrate a low temperature tunable synthesis that enables the preparation of one dimensional (1D) AuAg nanostructures ranging from nanowires to a new nano-necklace-like structure. Using a two-step method, we showed that, by aging the initial reaction mixture at various temperatures, we produced ultrathin AuAg nanowires with a diameter of 9.2 ± 2 and 3.8 ± 1.6 nm, respectively. These nanowires exhibited a high catalytic performance for the electro-oxidation of ethylene glycol with remarkable poisoning resistance. These results highlight the benefit of 1D metal alloy-based nanocatalysts for fuel cell applications and are expected to make an important contribution to the further development of fuel cell technology.

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Ultrathin PdAg single-crystalline nanowires enhance ethanol oxidation electrocatalysis

Cited by 138 publications

References 45 publications

Alloyed Palladium–Silver Nanowires Enabling Ultrastable Carbon Dioxide Reduction to Formate

Alloyed Palladium–Silver Nanowires Enabling Ultrastable Carbon Dioxide Reduction to Formate

Nanowire Genome: A Magic Toolbox for 1D Nanostructures

One Dimensional AuAg Nanostructures as Anodic Catalysts in the Ethylene Glycol Oxidation

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