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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Insights into the interfacial carrier behaviour of copper ferrite ( CuFe2O4) photoanodes for solar water oxidation
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Insights into the interfacial carrier behaviour of copper ferrite ( CuFe2O4) photoanodes for solar water oxidation

机译：太阳能水氧化铜铁素体（CUFE2O4）光桥界面的界面载波行为

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Designing efficient yet robust photoanodes for water oxidation stands out as a major bottleneck in the realization of a feasible photoelectrochemical tandem cell for solar water splitting. Spinel copper ferrite (CuFe2O4) has been recently reported as a potential candidate photoanode, exhibiting an extended light absorption (band gap of 1.9 eV) with respect to traditional metal oxides. However, limiting factors dictating the poor performance (0.5 mA cm(-2) at 1.6 V vs. RHE) remain unclear. Here, CuFe2O4 thin-film photoanodes were examined using frequency-dependent electrochemical techniques, namely photoelectrochemical impedance spectroscopy (PEIS) and intensity-modulated photocurrent/photovoltage spectroscopy (IMPS/IMVS), to provide a detailed description of the photogenerated charge carrier behaviour under operational conditions. Results evidenced a strong Fermi level pinning during oxygen evolution caused by the accumulation of surface intermediates and a relatively slow rate of charge transfer (k(tran) approximate to 5 s(-1)). Moreover, the short hole diffusion length (L-p approximate to 4 nm) and the low charge collection efficiency (below 10%) further prevent efficient charge extraction. Overall, these findings point towards the need of both film nanostructuring and surface engineering to further advance this photoanode.
机译：设计高效且坚固的水氧化果实作为实现太阳能分裂可行的光电化学串联电池的主要瓶颈。最近据报道了尖晶石铜铁素体（CUFE2O4）作为潜在的候选光电码，相对于传统金属氧化物，表现出延长光吸收（1.9eV的带隙）。然而，限制性因素决定了差的性能（0.5 mA cm（-2）为1.6 V与Rhe）仍然不清楚。这里，使用依赖依赖电化学技术，即光电化学阻抗谱（PEIS）和强度调制的光电流/光伏电压谱（IMPS / IMV）来检查CUFE2O4薄膜光耦合，以提供在操作下的光生电电荷载流子行为的详细描述状况。结果证明了由表面中间体积累和相对较慢的电荷转移速率（K（Tran）近似为5 s（-1））引起的氧气进化期间强烈的费米净化。此外，短孔扩散长度（L-P近似为4nm）和低电荷收集效率（低于10％）进一步防止有效的电荷提取。总体而言，这些发现指出了薄膜纳米结构和表面工程的需要进一步推进这款光电码。

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    Liu Yongpeng; Le Formal Florian; Boudoire Florent; Yao Liang; Sivula Kevin; Guijarro Nestor;

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    Ecole Polytech Fed Lausanne Lab Mol Engn Optoelect Nanomat LIMNO Stn 6 CH-1015 Lausanne Switzerland;

    Ecole Polytech Fed Lausanne Lab Mol Engn Optoelect Nanomat LIMNO Stn 6 CH-1015 Lausanne Switzerland;

    Ecole Polytech Fed Lausanne Lab Mol Engn Optoelect Nanomat LIMNO Stn 6 CH-1015 Lausanne Switzerland;

    Ecole Polytech Fed Lausanne Lab Mol Engn Optoelect Nanomat LIMNO Stn 6 CH-1015 Lausanne Switzerland;

    Ecole Polytech Fed Lausanne Lab Mol Engn Optoelect Nanomat LIMNO Stn 6 CH-1015 Lausanne Switzerland;

    Ecole Polytech Fed Lausanne Lab Mol Engn Optoelect Nanomat LIMNO Stn 6 CH-1015 Lausanne Switzerland;

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  • 正文语种 eng
  • 中图分类 工程材料学;
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