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首页> 外文期刊>RSC Advances >Insights into the spontaneous formation of hybrid PdOx/PEDOT films: electroless deposition and oxygen reduction activity
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Insights into the spontaneous formation of hybrid PdOx/PEDOT films: electroless deposition and oxygen reduction activity

机译：洞察杂交PDOX / PEDOT膜的自发形成：无电沉积和氧还原活性

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摘要

Hybrid palladium oxide/poly(3,4-ethylenedioxythiophene) (PdOx/PEDOT) films were prepared through a spontaneous reaction between aqueous PdCl42- ions and a nanostructured film of electropolymerized PEDOT. Spectroscopic and electrochemical characterization indicate the presence of mixed-valence Pd species as-deposited (19 +/- 7 at% Pd-0, 64 +/- 3 at% Pd2+, and 18 +/- 4 at% Pd4+ by X-ray photoelectron spectroscopy) and the formation of stable, electrochemically reversible Pd-0/alpha-PdOx active species in alkaline electrolyte and furthermore in the presence of oxygen. The elucidation of the Pd speciation as-deposited and in solution provides insight into the mechanism of electroless deposition in neutral aqueous conditions and the electrocatalytically active species during oxygen reduction in alkaline electrolyte. The PdOx/PEDOT film catalyses 4e(-) oxygen reduction (n = 3.97) in alkaline electrolyte at low overpotential (0.98 V vs. RHE, onset potential), with mass- and surface area-based specific activities competitive with, or superior to, commercial 20% Pt/C and state-of-the-art Pd- and PEDOT-based nanostructured catalysts. The high activity of the nanostructured hybrid PdOx/PEDOT film is attributed to effective dispersion of accessible, stable Pd active sites in the PEDOT matrix.
机译：通过PdCl42-离子水溶液和电聚合型染色膜与纳米结构薄膜之间的自发反应制备杂交钯/聚（3,4-亚乙二氧基噻吩）（PDOX / PEDOT）膜。光谱和电化学表征表明，通过X射线通过涂覆（19 +/- 7at％PD-0，64 +/- 3，18 +/- 4，18 +/- 4，18 +/- 4处的混合价Pd物种的存在光电子光谱）和在碱性电解质中形成稳定的电化学可逆PD-0 /α-PDOX活性物质，进一步存在于氧气存在下。沉积的PD物质和溶液的阐明提供了在碱性电解质的氧气还原过程中阐述中性水性条件和电象性活性物质中的无电沉积机制。 PDOX / PEDOT膜在低过电位（0.98V与RHE，发病势势）下碱性电解质中的4E（ - ）氧还原（n = 3.97），具有大规模和表面积的特定活动，具有竞争力，或优于，商业20％Pt / C和最先进的PDOT基础纳米结构催化剂。纳米结构杂交PDOX /佩特膜膜的高活性归因于探测基质中可接近的稳定PD活性位点的有效分散。

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  • 来源
    《RSC Advances》 |2018年第43期|共6页
  • 作者

    Vigil Julian A.; Brumbach Michael T.; Duay Jonathon; Lambert Timothy N.;

  • 作者单位

    Sandia Natl Labs Dept Mat Devices &

    Energy Technol Albuquerque NM 87185 USA;

    Sandia Natl Labs Mat Characterizat &

    Performance Albuquerque NM 87185 USA;

    Sandia Natl Labs Dept Mat Devices &

    Energy Technol Albuquerque NM 87185 USA;

    Sandia Natl Labs Dept Mat Devices &

    Energy Technol Albuquerque NM 87185 USA;

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  • 正文语种 eng
  • 中图分类 化学;
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