Dataset Information

Spherical Fe₇S₈@rGO nanoflowers as electrodes with high electrocatalytic performance in dye-sensitized solar cells.

ABSTRACT: Dye-sensitized solar cells (DSSCs) can directly convert solar energy into electricity, and have aroused great research interest from researchers. Here, the spherical Fe₇S₈@rGO nanocomposites were expediently fabricated by facile methods, and applied in DSSCs as counter electrodes (CEs). The morphological features show the porous structure of Fe₇S₈@rGO, and it is beneficial to enhance the permeability of ions. Reduced graphene oxide (rGO) has a large specific surface area and good electrical conductivity, shortening the electron transfer path. The presence of rGO promotes the catalytic reduction of I₃^- ions to I^- ions and reduces the charge transfer resistance (R_ct). The experimental findings show that the power conversion efficiency (PCE) of Fe₇S₈@rGO as CEs for DSSCs can reach 8.40% (20 wt% for rGO), significantly higher than Fe₇S₈ (7.60%) and Pt (7.69%). Therefore, Fe₇S₈@rGO nanocomposite is expected to be an efficient and cost-effective CE material for DSSCs.

SUBMITTER: Wang X

PROVIDER: S-EPMC10251488 | biostudies-literature | 2023 Jun

REPOSITORIES: biostudies-literature

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Spherical Fe7S8@rGO nanoflowers as electrodes with high electrocatalytic performance in dye-sensitized solar cells.

Wang Xiaoyu X Wang Wen W Yao Jixin J Zhang Qingxiao Q Gao Xin X Lin Changcheng C Yang Qun Q Zuo Xueqin X Jin Shaowei S Li Guang G

RSC advances 20230609 25

Dye-sensitized solar cells (DSSCs) can directly convert solar energy into electricity, and have aroused great research interest from researchers. Here, the spherical Fe7S8@rGO nanocomposites were expediently fabricated by facile methods, and applied in DSSCs as counter electrodes (CEs). The morphological features show the porous structure of Fe7S8@rGO, and it is beneficial to enhance the permeability of ions. Reduced graphene oxide (rGO) has a large sp ...[more]

PMID: 37304780

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Project description:In this feature article, we discuss the fundamental use of materials-characterization methods that directly determine structural information on the dye···TiO2 interface in dye-sensitized solar cells (DSCs). This interface is usually buried within the DSC and submerged in solvent and electrolyte, which renders such metrological work nontrivial. We will show how ex-situ X-ray reflectometry (XRR), atomic-force microscopy (AFM), grazing-incidence X-ray scattering (GIXS), pair-distribution-function analysis of X-ray diffraction data (gaPDF), and in-situ neutron reflectometry (NR) can be used to deliver specific structural information on the dye···TiO2 interface regarding dye anchoring, dye aggregation, molecular dye orientation, intermolecular spacing between dye molecules, interactions between the dye molecules and the TiO2 surface, and interactions between the dye molecules and the electrolyte components and precursors. Some of these materials-characterization techniques have been developed specifically for this purpose. We will demonstrate how the direct acquisition of such information from materials-characterization experiments is crucial for assembling a holistic structural picture of this interface, which in turn can be used to develop DSC design guidelines. Moreover, we will show how these methodologies can be used in the experimental-validation process of "design-to-device" pipelines for big-data- and machine-learning-based materials discovery. We conclude with an outlook on further developments of this design-to-device approach as well as the materials characterization of more dye···TiO2 interfacial structures that involve known DSC dyes using the methods described herein. In addition, we propose to combine these formally disparate metrologies so that their complementary merits can be exploited simultaneously. New metrologies of this kind could serve as a "one-stop-shop" for the materials characterization of surfaces, interfaces, and bulk structures in DSCs and other devices with layered architectures.

Dataset Information

Spherical Fe₇S₈@rGO nanoflowers as electrodes with high electrocatalytic performance in dye-sensitized solar cells.

Publications

Spherical Fe<sub>7</sub>S<sub>8</sub>@rGO nanoflowers as electrodes with high electrocatalytic performance in dye-sensitized solar cells.

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