In this study, zinc aluminum layered double hydroxide (ZnAl-LDH) with a Zn/Al molar ratio 8/1 was synthesized via a facile urea method, and the mixed metal oxide (MMO) was prepared using the corresponding LDH as a precursor. In order to improve the performance of electron transport layer, we introduced graphene into ZnAl-MMO to prepare new nanocomposites, ZnAl-MMO/graphene, as promising photoanodes for dye-sensitized solar cell (DSSC). The bare ZnAl-MMO and formed ZnAl-MMO/graphene nanocomposites were characterized by X-ray diffraction (XRD), Raman spectra, scanning electron microscope (SEM) and UV–vis absorption spectrum, confirming the presence of graphene and the wurtzite type phase of ZnO. A series of DSSC were fabricated by the corresponding nanocomposites and a D205 as dye. The photovoltaic behavior of these cells based on different graphene concentration was further investigated by electrochemical method. It turned out that the introduced graphene facilitated the dye adsorption and light-scattering, which heightened the performance of DSSC. The DSSC based on ZnAl-MMO/0.2 wt.% graphene reached the best power conversion efficiency (PCE) of 0.51%, showing a rise of 25% approximately when compared with plain ZnAl-MMO.

在这项研究中，通过简便的尿素方法合成了锌/铝摩尔比为8/1的锌铝层状双氢氧化物（ZnAl-LDH），并使用相应的LDH作为前体制备了混合金属氧化物（MMO）。为了提高电子传输层的性能，我们将石墨烯引入ZnAl-MMO中以制备新的纳米复合材料ZnAl-MMO /石墨烯，作为有望用于染料敏化太阳能电池（DSSC）的光阳极。裸露的ZnAl-MMO和形成的ZnAl-MMO /石墨烯纳米复合材料通过X射线衍射（XRD），拉曼光谱，扫描电子显微镜（SEM）和紫外可见吸收光谱进行了表征，证实了石墨烯和纤锌矿型相的存在。的ZnO。由相应的纳米复合材料和D205作为染料制备了一系列DSSC。通过电化学方法进一步研究了基于不同石墨烯浓度的这些电池的光伏行为。结果表明，引入的石墨烯促进了染料的吸附和光散射，从而提高了DSSC的性能。基于ZnAl-MMO / 0.2 wt。％石墨烯的DSSC达到0.51％的最佳功率转换效率（PCE），与普通ZnAl-MMO相比，大约提高了25％。