Research ArticleENVIRONMENTAL CHEMISTRY

Microbial synthesis of highly dispersed PdAu alloy for enhanced electrocatalysis

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Science Advances  30 Sep 2016:
Vol. 2, no. 9, e1600858
DOI: 10.1126/sciadv.1600858
  • Scheme 1 Formation mechanism for DPARH.

    NPs, nanoparticles.

  • Fig. 1 Morphological features of as-prepared materials in biosynthesis process.

    SEM images of (A) core/shell bacteria/Pd (BP), (B) BPA, (C) BPABG, and (D) DPARH.

  • Fig. 2 General electrocatalytic activities of optimized catalyst.

    Mass activities of DPARH and commercial Pd/C catalysts in CH3CH2OH and HCOOH electrooxidation.

  • Fig. 3 Morphological features and element distribution of as-prepared materials before and after the hydrothermal reaction.

    TEM (A1) and HRTEM (A2 and A3) imaging and HAADF-STEM elemental mapping (B1 to B6) of BPAGB. TEM (C1) and HRTEM (C2 and C3) imaging and HAADF-STEM elemental mapping (D1 to D6) of DPARH after hydrothermal reaction.

  • Fig. 4 Structure features.

    XRD pattern of S. oneidensis MR-1, BPAGB, and DPARH. a.u., arbitrary units.

  • Fig. 5 Surface atom features.

    XPS of BPAGB and DPARH.

  • Fig. 6 Detailed electrocatalytic performances of as-prepared catalysts.

    (A) CVs of the DPARH-, DPA-, DP-, and commercial Pd/C catalyst–modified electrodes in 1 M KOH + 1 M ethanol at a scan rate of 50 mV s−1 versus Ag/AgCl (saturated KCl). (B) Chronoamperometric curves of these catalyst-modified electrodes in 1 M KOH + 1 M ethanol at −0.3 V for 2000 s. (C) CVs of these catalyst-modified electrodes in 0.5 M H2SO4 + 0.5 M HCOOH at a scan rate of 50 mV s−1. (D) Chronoamperometric curves of these catalyst-modified electrodes in 0.5 M H2SO4 + 0.5 M HCOOH at 0.1 V for 2000 s. The Pd mass amounts of all the catalysts were about 1 μg in each electrode.

Supplementary Materials

  • Supplementary material for this article is available at http://advances.sciencemag.org/cgi/content/full/2/9/e1600858/DC1

    fig. S1. The mechanism of biosynthesis.

    fig. S2. Morphological feature of different biocatalysts.

    fig. S3. Atomic ratio of as-prepared catalyst.

    fig. S4. Feature of graphene.

    fig. S5. CO stripping for the DPARH and commercial Pd/C.

    fig. S6. Ethanol electrooxidation activities of the DPARH synthesized under different conditions.

    fig. S7. Formic acid electrooxidation activities of the DPARH synthesized under different conditions.

    table S1. Electrocatalytic mass activities of different catalysts in previous studies.

    table S2. Atomic ratio of the DPARH from the XPS data.

    table S3. Electrocatalytic mass activities of DPARH synthesized under different conditions.

    References (5564)

  • Supplementary Materials

    This PDF file includes:

    • fig. S1. The mechanism of biosynthesis.
    • fig. S2. Morphological feature of different biocatalysts.
    • fig. S3. Atomic ratio of as-prepared catalyst.
    • fig. S4. Feature of graphene.
    • fig. S5. CO stripping for the DPARH and commercial Pd/C.
    • fig. S6. Ethanol electrooxidation activities of the DPARH synthesized under different conditions.
    • fig. S7. Formic acid electrooxidation activities of the DPARH synthesized under different conditions.
    • table S1. Electrocatalytic mass activities of different catalysts in previous studies.
    • table S2. Atomic ratio of the DPARH from the XPS data.
    • table S3. Electrocatalytic mass activities of DPARH synthesized under different conditions.
    • References (5564)

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