通过石墨烯纳米带进行 TiO2 光阳极的界面工程，用于高效量子点敏化太阳能电池和光电化学水分解,Energy & Fuels

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通过石墨烯纳米带进行 TiO2 光阳极的界面工程，用于高效量子点敏化太阳能电池和光电化学水分解
Energy & Fuels ( IF 5.2 ) Pub Date : 2023-09-14 , DOI: 10.1021/acs.energyfuels.3c02266
Iqbal Singh ₁ , Viplove Bhullar ₁ , Aman Mahajan ₁

Affiliation

量子点（QD）敏化TiO ₂光阳极是量子点敏化太阳能电池（QDSSC）和光电化学（PEC）水分解应用的常见组件。量子点敏化TiO ₂光阳极从太阳光中收集能量，然后分别通过QDSSC和PEC水分解装置产生电能和清洁的H _2燃料。尽管进行了各种界面修饰，这种光电阳极仍然会遭受大量的重组和不良的电子传输，从而降低了器件的性能。在目前的工作中，高导电性一维（1D）石墨烯纳米带（GNR）已被纳入基于 TiO ₂的致密材料和介孔（m-TiO ₂）层以减少复合并实现卓越的电荷传输网络。最初，GNR的含量在致密层中进行了优化，QDSSC中的最大功率转换效率（PCE）和PEC水分解中的光电流密度分别达到了约2.33％和1.92 mA cm ^–2。此外，在 m-TiO ₂层中加入 GNR 可提高 QDSSC 和 PEC 水分解中的短路电流密度和更好的电子传输。优化后的器件显示 QDSSC 的 PCE 为 3.06%，电流为 2.39 mA cm ^–2PEC 水分解的光电流密度。之后，两种情况下的 GNR 优化浓度已用于制备器件，使 QDSSC 和 PEC 水分解的 PCE 和光电流密度分别提高 113% 和 80%。此外，通过优化光电阳极的共敏化，QDSSC 的 PCE 提高到 4.55%，PEC 水分解装置的光电流密度提高到 2.67 mA cm ^{–2 。}

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Interfacial Engineering of a TiO2 Photoanode via Graphene Nanoribbons for Efficient Quantum-Dot-Sensitized Solar Cells and Photoelectrochemical Water Splitting

Quantum dot (QD)-sensitized TiO₂ photoanodes are a common component of quantum dot-sensitized solar cells (QDSSCs) and photoelectrochemical (PEC) water-splitting applications. The QD-sensitized TiO₂ photoanode harvested energy from sunlight and then produced electric energy and clean H₂ fuel by QDSSCs and PEC water-splitting devices, respectively. Despite various interfacial modifications, such photoanode still suffers from numerous recombinations and poor electron transport, degrading the performance of devices. In the present work, highly conductive one-dimensional (1D) graphene nanoribbons (GNRs) have been incorporated in both TiO₂-based compact as well as mesoporous (m-TiO₂) layers to reduce recombinations and achieve a superior charge transport network. Initially, the content of GNR has been optimized in a compact layer, and the maximum power conversion efficiency (PCE) in QDSSCs and photocurrent density in PEC water splitting have been attained around 2.33% and 1.92 mA cm^–2, respectively. Furthermore, incorporation of GNR in the m-TiO₂ layer delivered enhanced short-circuit current density and better electron transport in both QDSSCs and PEC water splitting. The optimized device showed 3.06% PCE for QDSSCs and 2.39 mA cm^–2 photocurrent density for PEC water splitting. After that, the optimized concentrations of GNR from both cases have been used to prepare devices that give 113 and 80% enhancement in PCE and photocurrent density in QDSSCs and PEC water splitting, respectively. Moreover, an improvement in PCE of QDSSCs to 4.55% and photocurrent density of the PEC water-splitting device of 2.67 mA cm^–2 has been recorded with co-sensitization of the optimized photoanode.

更新日期：2023-09-14

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