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Zinc Ferrite Photoanode Nanomorphologies with Favorable Kinetics for Water-Splitting

机译：具有良好动力学的水分解锌铁氧体光电阳极纳米形态

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摘要

The n-type semiconducting spinel zinc ferrite (ZnFe2O4) is used as a photoabsorber material for light-driven water-splitting. It is prepared for the first time by atomic layer deposition. Using the resulting well-defined thin films as a model system, the performance of ZnFe2O4 in photoelectrochemical water oxidation is characterized. Compared to benchmark -Fe2O3 (hematite) films, ZnFe2O4 thin films achieve a lower photocurrent at the reversible potential. However, the oxidation onset potential of ZnFe2O4 is 200 mV more cathodic, allowing the water-splitting reaction to proceed at a lower external bias and resulting in a maximum applied-bias power efficiency (ABPE) similar to that of Fe2O3. The kinetics of the water oxidation reaction are examined by intensity-modulated photocurrent spectroscopy. The data indicate a considerably higher charge transfer efficiency of ZnFe2O4 at potentials between 0.8 and 1.3 V versus the reversible hydrogen electrode, attributable to significantly slower surface charge recombination. Finally, nanostructured ZnFe2O4 photoanodes employing a macroporous antimony-doped tin oxide current collector reach a five times higher photocurrent than the flat films. The maximum ABPE of these host-guest photoanodes is similarly increased.
机译：n型半导体尖晶石锌铁氧体（ZnFe2O4）用作光驱动水分解的光吸收材料。它是通过原子层沉积首次制备的。使用得到的清晰的薄膜作为模型系统，表征了ZnFe2O4在光电化学水氧化中的性能。与基准-Fe2O3（赤铁矿）薄膜相比，ZnFe2O4薄膜在可逆电位下具有较低的光电流。但是，ZnFe2O4的阴极氧化开始电位高200 mV，使水分解反应在较低的外部偏压下进行，从而产生了与Fe2O3相似的最大施加偏压功率效率（ABPE）。水氧化反应的动力学通过强度调制光电流光谱法检查。数据表明，与可逆氢电极相比，ZnFe2O4在0.8至1.3 V之间的电势下具有更高的电荷转移效率，这归因于表面电荷复合的明显减慢。最后，采用大孔掺杂锑的氧化锡集电器的纳米结构ZnFe2O4光电阳极的光电流比平膜高五倍。这些主客体光阳极的最大ABPE同样增加。

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  • 来源
    《Advanced Functional Materials》 |2016年第25期|4435-4443|共9页
  • 作者

    Hufnagel Alexander G.; Peters Kristina; Mueller Alexander; Scheu Christina; Ng Dina Fattakhova-Rohlfi; Bein Thomas;

  • 作者单位

    Univ Munich, Dept Chem, Butenandtstr 5-13, D-81377 Munich, Germany|Univ Munich, Ctr NanoSci CeNS, Butenandtstr 5-13, D-81377 Munich, Germany;

    Univ Munich, Dept Chem, Butenandtstr 5-13, D-81377 Munich, Germany|Univ Munich, Ctr NanoSci CeNS, Butenandtstr 5-13, D-81377 Munich, Germany;

    Max Planck Inst Eisenforsch GmbH, Max Planck Str 1, D-40237 Dusseldorf, Germany;

    Max Planck Inst Eisenforsch GmbH, Max Planck Str 1, D-40237 Dusseldorf, Germany;

    Univ Munich, Dept Chem, Butenandtstr 5-13, D-81377 Munich, Germany|Univ Munich, Ctr NanoSci CeNS, Butenandtstr 5-13, D-81377 Munich, Germany;

    Univ Munich, Dept Chem, Butenandtstr 5-13, D-81377 Munich, Germany|Univ Munich, Ctr NanoSci CeNS, Butenandtstr 5-13, D-81377 Munich, Germany;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    atomic layer deposition; host-guest; kinetics; photoelectrochemical water splitting; zinc ferrite;

    机译：原子层沉积;主客体;动力学;光电化学水分解;铁素体锌;

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