Cobalt ferrite/cobalt-iron alloy nano composite 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 method comprises the following steps of taking Fe(NO3)3.9H2O and Co(NO3)2.6H2O as reactants, dissolving the reactants in a solvent, and preparing FeCo-glycerate precursor nanospheres through a solvothermal method, respectively dissolving the precursor nanospheres and K3[Co(CN)6] in water, mixing, separating, drying and sintering to obtain a target product. The specific surface area and the contact area are increased through the unique core-shell structure of CoFe2O4 in the product, the ion diffusion distance is shortened, more surface active sites are introduced, electron transfer is improved through the synergistic effect and the chemical coupling effect of CoFe2O4 and the Co3Fe7 alloy on the surface, and therefore electron transfer is accelerated, reaction kinetics is promoted, the electrochemical performance is improved, therefore, the photovoltaic performance is obviously enhanced, and the application field is expanded.

Description

technical field [0001] The invention relates to the field of nanometer materials, 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 great utilization potential. Dye-sensitized solar cells have attracted extensive attention among various solar cells due to their facile 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 a vital role. The design and preparation of c...

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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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