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Graphene-intercalated Fe2O3/TiO2 heterojunctions for efficient photoelectrolysis of water

机译：石墨烯嵌入的Fe2O3 / TiO2杂交功能用于水的有效光电解

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Interfacial modification of alpha-Fe2O3/TiO2 multilayer photoanodes by intercalating few-layer graphene (FLG) was found to improve water splitting efficiency due to superior transport properties, when compared to individual iron and titanium oxides and heterojunctions thereof. Both metal oxides and graphene sheets were grown by plasma-enhanced chemical vapor deposition. Compared to the onset potential achieved for alpha-Fe2O3 films (1 V vs. RHE), the alpha-Fe2O3/TiO2 bilayer structure yielded a better onset potential (0.3 V vs. RHE). Heterojunctioned bilayers exhibited a higher photocurrent density (0.32 mA cm(-2) at 1.23 V vs. RHE) than the single alpha-Fe2O3 layer (0.22 mA cm(-2) at 1.23 V vs. RHE), indicating more efficient light harvesting and higher concentration of photogenerated charge carriers. For more efficient charge transport at the interface, a few layer graphene sheet was intercalated into the alpha-Fe2O3/TiO2 interface, which substantially increased the photocurrent density to 0.85 mA cm(-2) (1.23 V vs. RHE) and shifted the onset potential (0.25 V vs. RHE). Ultrafast transient absorption spectroscopy studies indicated that the incorporation of FLG between the alpha-Fe2O3 and TiO2 layers resulted in reduced recombination in the alpha-Fe2O3 layer. The results showed that graphene intercalation improved the charge separation and the photocurrent density of the FTO/alpha-Fe2O3/FLG/TiO2 system.
机译：发现通过嵌入少数层石墨烯（FLG）来互换α-Fe2O3 / TiO2多层光阳极，以改善由于优异的运输性能而与单独的铁和氧化钛和杂交函数相比，提高水分裂效率。通过等离子体增强的化学气相沉积而生长金属氧化物和石墨烯片。与α-Fe2O3膜（1Vs.She）实现的发作电位相比，α-Fe 2 O 3 / TiO2双层结构产生更好的发作潜力（0.3V与Rhe）。杂障碍双层在1.23V与rh rh的光电流密度（0.32mA cm（-2））上表现出比单一α-Fe 2 O 3层（0.22mAcm（-2）为1.23V与Rhe），表明更有效的光收获较高浓度的光泌型电荷载体。对于在界面处更有效的电荷传输，将几层石墨​​烯片嵌入到α-Fe 2 O 3 / TiO2界面中，其基本上增加了光电响起至0.85 mA cm（-2）（1.23V与Rhe）并移位潜力（0.25 V与RHE）。超快瞬态吸收光谱研究表明，在α-Fe 2 O 3和TiO 2层之间的掺入导致α-Fe 2 O 3层中的重组减少。结果表明，石墨烯嵌入改善了FTO /α-FE2O3 / FLG / TiO2系统的电荷分离和光电流密度。

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  • 来源
    《RSC Advances》 |2015年第123期|共7页
  • 作者

    Kaouk A.; Ruoko T. -P.; Gonullu Y.; Kaunisto K.; Mettenborger A.; Gurevich E.; Lemmetyinen H.; Ostendorf A.; Mathur S.;

  • 作者单位

    Univ Cologne Inst Inorgan Chem D-50939 Cologne Germany;

    Univ Cologne Inst Inorgan Chem D-50939 Cologne Germany;

    Univ Cologne Inst Inorgan Chem D-50939 Cologne Germany;

    Tampere Univ Technol Dept Chem &

    Bioengn Tampere 33710 Finland;

    Univ Cologne Inst Inorgan Chem D-50939 Cologne Germany;

    Ruhr Univ Bochum Lehrstuhl Laseranwendungstech D-44801 Bochum Germany;

    Tampere Univ Technol Dept Chem &

    Bioengn Tampere 33710 Finland;

    Ruhr Univ Bochum Lehrstuhl Laseranwendungstech D-44801 Bochum Germany;

    Univ Cologne Inst Inorgan Chem D-50939 Cologne Germany;

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  • 正文语种 eng
  • 中图分类 化学;
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