Dye-sensitized photoelectrochemical tandem cells have shown the promise for light driven hydrogen production from water owing to the low cost, wide absorption spectra in the visible region and ease to process of their constitutive photoelectrode materials. However, most photo-driven water splitting photoelectrochemical cells driven by organic dye sensitized solar cells exhibit unsatisfactory hydrogen evolution rate, primarily attributed to their poor light capturing ability and low photocurrent performance. Here we present the construction of a tandem system consisting of an organic blue-colored S5 sensitizer-based dye-sensitized photoelectrochemical cell (DSPEC) wired in series with three spectral-complemental dyes BTA-2, APP-3 and APP-1 sensitizers-based dye-sensitized solar cell (DSC), respectively. The two spectral-complemental chromophores were used in DSC and DSPEC to ensure that the full solar spectrum could be absorbed as much as possible. The results showed that the photocurrent of tandem device was closely related to the open-circuit voltage (V_oc) of sensitized DSC, in which the tandem configuration consisting of S5 based DSPEC and BTA-2 based DSC gave the best photocurrent. On this basis, tandem device with the only light energy and no external applied electrical bias was further constructed of BTA-2 based 2-junction DSC and S5 based DSPEC and obtained a photocurrent of 500 µA cm⁻² for hydrogen generation. Furthermore, I⁻/I₃⁻ was used as a redox couple between dye regeneration and O₂ production on the surface of Pt-IrO₂/WO₃. The strategy opens up the application of pure organic dyes in DSC/DSPEC tandem device.

中文翻译：

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以I-/ I 3-为氧化还原介体的串联有机染料敏化太阳能电池光驱动水分解光电化学电池

染料敏化的光电化学串联电池由于其低成本，在可见光区域的宽吸收光谱以及易于加工其组成型光电极材料而显示出从水中产生光驱动氢的前景。然而，大多数由有机染料敏化太阳能电池驱动的光驱动水分解光电化学电池表现出不令人满意的氢释放速率，这主要归因于其较差的光捕获能力和低的光电流性能。在这里，我们介绍一个串联系统的构建，该系统由与三种光谱互补染料BTA-2，APP-3和APP-1串联连接的基于有机S5增感剂的蓝色蓝光染料敏化光电化学电池（DSPEC）组成基于敏化剂的染料敏化太阳能电池（DSC）。DSC和DSPEC中使用了两种光谱互补的生色团，以确保可以尽可能多地吸收整个太阳光谱。结果表明，串联器件的光电流与敏化DSC的开路电压（V _oc）密切相关，其中串联结构由基于S5的DSPEC和基于BTA-2的DSC组成，具有最佳的光电流。在此基础上，进一步构造了仅具有光能且没有外部施加电偏压的串联装置，该串联装置由基于BTA-2的2结DSC和基于S5的DSPEC构成，并获得了500 µA cm ^-2的光电流。用于制氢。此外，我^- / I ₃ ^-用作氧化还原对染料再生和O之间₂的Pt-的IrO的表面上制作₂ / WO ₃。该策略打开了纯有机染料在DSC / DSPEC串联设备中的应用。