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首页> 外文期刊>Chemistry: A European journal >Ultrathin FeSe2 Nanosheets: Controlled Synthesis and Application as a Heterogeneous Catalyst in Dye-Sensitized Solar Cells
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Ultrathin FeSe2 Nanosheets: Controlled Synthesis and Application as a Heterogeneous Catalyst in Dye-Sensitized Solar Cells

机译：超薄FeSe2纳米片：受控合成及其在染料敏化太阳能电池中作为非均相催化剂的应用

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摘要

Two-dimensional (2D) semiconducting nanosheets have emerged as an important field of materials, owing to their unique properties and potential applications in areas ranging from electronics to catalysis. However, the controlled synthesis of ultrathin 2D nanosheets remains a great challenge, due to the lack of an intrinsic driving force for anisotropic growth. High-quality ultrathin 2D FeSe2 nanosheets with average thickness below 7 nm have been synthesized on large scale by a facile solution method, and a formation mechanism has been proposed. Due to their favorable structural features, the as-synthesized ultrathin FeSe2 nanosheets exhibit excellent electrocatalytic activity for the reduction of triiodide to iodide and low charge-transfer resistance at the electrolyte-electrode interface in dye-sensitized solar cells (DSSCs). The DSSCs with FeSe2 nanosheets as counter electrode material achieve a high power conversion efficiency of 7.53% under a simulated solar illumination of 100 mWcm(-2) (AM 1.5), which is comparable with that of Pt-based devices (7.47 %).
机译：二维（2D）半导体纳米片由于其独特的性能以及在从电子学到催化学等领域的潜在应用而成为一种重要的材料领域。然而，由于缺乏各向异性生长的内在驱动力，超薄2D纳米片的受控合成仍然是一个巨大的挑战。通过简便的溶液法大规模合成了平均厚度低于7 nm的高质量超薄二维FeSe2纳米片，并提出了形成机理。由于其良好的结构特征，刚合成的超薄FeSe2纳米片在染料敏化太阳能电池（DSSC）的电解质-电极界面处表现出优异的电催化活性，可还原三碘化物至碘化物，并具有低电荷转移阻力。以FeSe2纳米片作为对电极材料的DSSC在100 mWcm（-2）（AM 1.5）的模拟太阳光照下可实现7.53％的高功率转换效率，这与基于Pt的器件（7.47％）相当。

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