Photocathode with superior catalytic activity, long-term stability, and fast mass/electron transfer is highly desirable but challenging for dye-sensitized solar cell (DSC). Herein, the ZIF-67 grown on carbon cloth is successfully transformed into CoSe₂ embedded in N-doped carbon nanocage (CoSe₂/N-C) via a growth-carbonization-selenization process. The carbon cloth supported CoSe₂/N-C, as photocathode of DSC, demonstrates a good long-term stability and high photovoltaic efficiency (8.40%), outperforming Pt. The good efficiency can be attributed to the high catalytic activity of CoSe₂, fast mass transfer of porous 3D structure, and good electron transport derived from the intimate contact between CoSe₂ and highly conductive carbon cloth. The high stability would be ascribed to N-doped carbon coating that perfectly prevents CoSe₂ from decomposition. This work will pave the way to develop highly efficient and stable Pt-free photocathode for DSC.

中文翻译：

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固定在碳布上的多孔N掺杂碳涂层CoSe 2作为3D光电阴极，用于染料敏化太阳能电池，其效率和稳定性优于Pt

具有优异的催化活性，长期稳定性和快速的质量/电子转移的光阴极是非常需要的，但对于染料敏化太阳能电池（DSC）却具有挑战性。在此，在碳布的ZIF-67生长的成功转化成COSE ₂嵌入在N掺杂碳纳米笼（COSE ₂经由生长碳化-硒化工艺/ NC）。碳布支撑的CoSe ₂ / NC作为DSC的光电阴极，具有良好的长期稳定性和较高的光伏效率（8.40％），优于Pt。良好的效率归因于CoSe ₂的高催化活性，多孔3D结构的快速质量传递以及源自CoSe ₂之间紧密接触的良好电子传输和高导电性的碳布。高稳定性归因于完全防止CoSe ₂分解的N掺杂碳涂层。这项工作将为开发用于DSC的高效，稳定的无铂光电阴极铺平道路。