A cobalt ferrite/cobalt iron alloy nanocomposite counter electrode material and preparation method thereof

Abstract

The invention discloses a cobalt ferrite / cobalt iron alloy nano-composite counter electrode material and a preparation method thereof. The preparation process is as follows: using Fe(NO 3 ) 3 ·9H 2 O, Co(NO 3 ) 2 ·6H 2 O is a reactant, which was dissolved in a solvent to prepare FeCo-glycerate precursor nanospheres by solvothermal method; the precursor nanospheres and K 3 [Co(CN) 6 ] were dissolved in water, mixed, separated, dried and sintered to obtain the target product. CoFe in this product 2 O 4 The unique core-shell structure increases the specific surface area and contact area, shortens the ion diffusion distance, and introduces more surface active sites, which are compatible with the surface Co. 3 Fe 7 The synergy and chemical coupling of the alloy improves electron transport, thereby accelerating electron transfer, promoting reaction kinetics, and enhancing electrochemical performance, thereby significantly enhancing its photovoltaic performance and expanding its application field.

Description

technical field [0001] The invention relates to the field of nanomaterials, and relates to a cobalt ferrite / cobalt iron alloy nanocomposite counter electrode material and a preparation method thereof. Background technique [0002] In recent years, due to the increasingly prominent environmental pollution and energy problems caused by the excessive consumption of fossil energy, sustainable energy has received continuous attention and rapid development. As the most abundant renewable energy and clean energy, solar energy has huge potential for utilization. Dye-sensitized solar cells have received extensive attention in various solar cells due to their simple fabrication process and high efficiency. As one of the important components of dye-sensitized solar cells, the counter electrode conducts electrons in the external circuit and catalyzes I at the counter electrode-electrolyte interface. 3 - revert to I - aspect plays an important role. The design, preparation and impro...

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Problems solved by technology

The design and preparation of counter electrode materials with high electrocatalytic performance and low cost and the improvement of their electrocatalytic activity have always been the frontier hot areas of research by scientists. Cobalt ferrite (CoFe 2 o 4 ) have been found to be used as air cathode catalysts and anode active materials. The introduction of cobalt into iron-based composites can increase the active sites, modify the electronic structure, and accelerate the electron transfer between the electrode and the electrolyte, thereby improving the electrocatalytic activity of the material. However, its poor electronic conductivity and sluggish reaction kinetics lead to low efficiency of the material itself in solar energy utilization.

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