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首页> 外文期刊>RSC Advances >Dye-sensitization of boron-doped diamond foam: champion photoelectrochemical performance of diamond electrodes under solar light illumination
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Dye-sensitization of boron-doped diamond foam: champion photoelectrochemical performance of diamond electrodes under solar light illumination

机译：硼掺杂金刚石泡沫的染料敏化：太阳灯照明下金刚石电极的冠军光电化学性能

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摘要

Diamond foams composed of hollow spheres of polycrystalline boron-doped diamond are chemically modified with two donor-acceptor type molecular dyes, BT-Rho and CPDT-Fur, and tested as electrode materials for p-type dye-sensitized solar cells with an aqueous electrolyte solution containing methyl viologen as a redox mediator. Reference experiments with flat polycrystalline diamond electrodes evidence full blocking of the methyl viologen redox reaction by these dyes, whereas only partial blocking is observed for the diamond foams. This is ascribed to sp(2)-carbon impurities in the foam, viz. trans-polyacetylene and graphite-like carbon. Cathodic photocurrents under solar light illumination are about 3 times larger on foam electrodes compared to flat diamond. Long-term (1-2 days) illumination of the sensitized foam electrodes with chopped light at 1 sun intensity causes an increase of the cathodic photocurrent density to ca. 15-22 mu A cm(-2). These photocurrent densities represent the largest values reported so far for dye-sensitized diamond electrodes. The photoelectrochemical activation of the sensitized diamond electrodes is accompanied with characteristic changes of the dark voltammogram of the MV2+/MV+ redox couple and with gradual changes of the IPCE spectra.
机译：由多晶硼掺杂金刚石的中空球体组成的金刚石泡沫，用两种供体 - 受体型分子染料，BT-RHO和CPDT-毛，并作为P型染料敏化太阳能电池的电极材料进行了测试，具有水性电解质含有甲基Viologen作为氧化还原介体的溶液。具有扁平多晶金刚石电极的参考实验证据通过这些染料完全阻断甲基Viologen氧化还原反应，而仅观察到金刚石泡沫的部分阻断。这归因于泡沫，Viz中的SP（2） - 碳杂质。反式聚乙炔和石墨碳。与扁平金刚石相比，在太阳光照下的阴极光电流下的阴光照射在泡沫电极上较大约3倍。长期（1-2天）在1个太阳强度下具有切碎光的敏化泡沫电极的照明导致阴极光电流密度增加到CA. 15-22 mu a cm（-2）。这些光电流密度代表到目前为止染料敏化金刚石电极报告的最大值。敏化金刚石电极的光电化学激活伴随着MV2 + / MV +氧化还原耦合的黑暗伏安图的特征变化，以及IPCE光谱的逐渐变化。

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  • 来源
    《RSC Advances》 |2015年第99期|共9页
  • 作者

    Krysova Hana; Kavan Ladislav; Zivcova Zuzana Vlckova; Yeap Weng Siang; Verstappen Pieter; Maes Wouter; Haenen Ken; Gao Fang; Nebel Christoph E.;

  • 作者单位

    AS CR Vvi J Heyrovsky Inst Phys Chem CZ-18223 Prague 8 Czech Republic;

    AS CR Vvi J Heyrovsky Inst Phys Chem CZ-18223 Prague 8 Czech Republic;

    AS CR Vvi J Heyrovsky Inst Phys Chem CZ-18223 Prague 8 Czech Republic;

    Hasselt Univ Inst Mat Res IMO B-3590 Diepenbeek Belgium;

    Hasselt Univ Inst Mat Res IMO B-3590 Diepenbeek Belgium;

    IMOMEC IMEC Vzw B-3590 Diepenbeek Belgium;

    IMOMEC IMEC Vzw B-3590 Diepenbeek Belgium;

    Fraunhofer Inst Appl Solid State Phys IAF D-79108 Freiburg Germany;

    Fraunhofer Inst Appl Solid State Phys IAF D-79108 Freiburg Germany;

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  • 正文语种 eng
  • 中图分类 化学;
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