Wahyuono Ruri Agung, Dellith Andrea, Schmidt Christa, Dellith Jan, Ignaszak Anna, Seyring Martin, Rettenmayr Markus, Fize Jennifer, Artero Vincent, Chavarot-Kerlidou Murielle, Dietzek Benjamin
Leibniz Institute of Photonic Technology (IPHT), Department Functional Interfaces Jena e. V. Albert-Einstein-Str. 9 07745 Jena Germany
Institute for Physical Chemistry and Abbe Center of Photonics, Friedrich Schiller University Jena Helmholtzweg 4 07743 Jena Germany.
RSC Adv. 2019 Nov 29;9(67):39422-39433. doi: 10.1039/c9ra08785k. eCollection 2019 Nov 27.
We report the wet chemical synthesis of mesoporous NiO nanostars (NS) as photocathode material for dye-sensitized solar cells (DSSCs). The growth mechanism of NiO NS as a new morphology of NiO is assessed by TEM and spectroscopic investigations. The NiO NS are obtained upon annealing of preformed β-Ni(OH) into pristine NiO with low defect concentrations and favorable electronic configuration for dye sensitization. The NiO NS consist of fibers self-assembled from nanoparticles yielding a specific surface area of 44.9 m g. They possess a band gap of 3.83 eV and can be sensitized by molecular photosensitizers bearing a range of anchoring groups, carboxylic acid, phosphonic acid, and pyridine. The performance of NiO NS-based photocathodes in photoelectrochemical application is compared to that of other NiO morphologies, nanoparticles and nanoflakes, under identical conditions. Sensitization of NiO NS with the benchmark organic dye P1 leads to p-DSSCs with a high photocurrent up to 3.91 mA cm whilst the photoelectrochemical activity of the NiO NS photocathode in aqueous medium in the presence of an irreversible electron acceptor is reflected by generation of a photocurrent up to 23 μA cm.
我们报道了介孔氧化镍纳米星（NS）作为染料敏化太阳能电池（DSSC）光阴极材料的湿化学合成方法。通过透射电子显微镜（TEM）和光谱研究评估了作为氧化镍新形态的氧化镍纳米星的生长机制。氧化镍纳米星是通过将预先形成的β - 氢氧化镍退火转变为原始氧化镍而获得的，其具有低缺陷浓度和有利于染料敏化的电子构型。氧化镍纳米星由纳米颗粒自组装而成的纤维组成，比表面积为44.9 m²/g。它们的带隙为3.83 eV，并且可以被带有一系列锚定基团（羧酸、膦酸和吡啶）的分子光敏剂敏化。在相同条件下，将基于氧化镍纳米星的光阴极在光电化学应用中的性能与其他氧化镍形态（纳米颗粒和纳米片）进行了比较。用基准有机染料P1对氧化镍纳米星进行敏化，可得到具有高达3.91 mA/cm²高光电流的p型染料敏化太阳能电池，而在存在不可逆电子受体的水性介质中，氧化镍纳米星光阴极的光电化学活性通过产生高达23 μA/cm²的光电流得以体现。
