Graphene/iron-nickel sulfo-spinel composite catalyst, preparation method therefor, and method for preparing dye-sensitized solar cell

Abstract

The invention discloses a graphene / iron-nickel sulfo-spinel composite catalyst, and the composite catalyst comprises graphene oxide serving as a substrate, and iron-nickel sulfide which is in in-situ growth on graphene and is in a spinel structure. The atom ratio of iron, nickel and sulfur in the iron-nickel sulfide is x: (3-x): 4, wherein x is greater than zero and less than three. The invention also provides a preparation method for the composite catalyst, and a method for preparing a dye-sensitized solar cell. The composite catalyst is ingenious in design, is simple in manufacturing technology, well solves problems that a non-platinum system catalyst is low in catalytic efficiency and a platinum catalyst is high in cost, and can meet the demands of the industrial production well. Therefore, the composite catalyst is wide in application range, and is very suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of dye-sensitized solar cells, in particular to a graphene / iron-nickel sulfide spinel (Fe x Ni 3-x S 4 ) composite catalyst, its preparation method and the method for preparing dye-sensitized solar cell. Background technique [0002] Dye-sensitized solar cell (Dye-sensitizedSoalrcell, referred to as DSC) is a new type of low-cost photochemical cell based on nanostructures. Since the introduction of nanomaterials in the 1990s, DSC has set off a research boom in various countries due to its many advantages such as low cost, simple preparation process, high photoelectric conversion efficiency, and broad potential market applications. [0003] The counter electrode is an important part of the DSC, and its function is mainly to collect electrons flowing in from the external circuit and transfer them to the oxidation products or holes in the electrolyte to complete the regeneration process of the electrolyte. ...

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Problems solved by technology

[0005] 1. As a precious metal element, resources are scarce and expensive;

[0006] 2. There are certain defects in the preparation process of platinum counter electrodes for DSC, for example: (1) The pyrolysis method requires the substrate to withstand high temperature sintering above 375°C, which is not suitable for transparent polymer conductive substrates, and the prepared platinum counter electrodes have individual differences Slightly larger; (2) The sputtering method requires high target purity and low sputtering vacuum, which is not suitable for the preparation of large-area counter electrodes; (3) The electrodeposition method uses more platinum raw materials, and the electrode charge exchange resistance is relatively large;

[0007] 3. The catalytic activity of the platinum counter electrode to different system electrolytes is quite different, which is suitable for iodine system electrolytes, but has poor catalytic activity for polysulfide system electrolytes;

[0008] 4. The stability of the platinum counter electrode is poor, and it is easily absorbed by I in the electrolyte. 3 - / I - Corrosion and passivation, loss of catalytic activity

[0014] Although the synthesis and application of non-platinum system catalysts have been extensively studied, and the performance of some catalysts is close to or reaches the effect of traditional Pt catalysts, the development of non-platinum system catalysts still faces low catalytic efficiency and low cost. High, complex preparation process, stability yet to be verified and other issues limit the large-scale preparation and application of new catalysts

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