Process for electrodeposition preparation of cuprous sulfocyanide film in aqueous solution

Abstract

The water solution electrodepositing process of preparing cuprous thiocyanate (CuSCN) film includes the following steps: dissolving copper salt, thiocyanate and chelate in certain proportion into water as solvent; regulating the pH value to 2-7 to obtain electrolyte solution for electrodeposition; static complexing and homogenizing of the electrolyte solution for 4-72 hr; cleaning the base for electrodeposition with organic solvent, acid solution, alkali solution and water; and electrodepositing in common electrochemical deposition process. The electrochemical deposition process has temperature 15-75 deg.c and deposition potential from 0.2 v to -0.65 v. The deposited CuSCN film is water washed and dried at 60-100 deg.c. The present invention has the features of high stability of the electrodepositing solution, high depositing efficiency, low cost, less pollution and being suitable for various kinds of base material.

Description

technical field [0001] The invention relates to a method for preparing cuprous thiocyanate film by electrodeposition in aqueous solution. Background technique [0002] With the rapid development of China and the world economy, the demand for energy has increased dramatically. The environmental pollution caused by the increasing consumption of fossil energy, such as coal, oil and natural gas, and the continuous deterioration of the global climate caused by greenhouse gas emissions have attracted great attention from all countries in recent years. Various countries, including China, have begun to formulate corresponding policies to strengthen the research and development of green and renewable energy. In the 21st century China's sustainable development strategy white paper "China's 21st Century Agenda", it is mentioned that "renewable energy is the foundation of future energy", "priority is given to the development of renewable energy in the national ...

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Problems solved by technology

[0005] At present, the main problems in the preparation of CuSCN thin films by electrodeposition are: (1) The electrolyte uses organic liquids as solvents, such as ethanol, acetone, etc., so the main raw materials must use organic groups or bulky anions with high solubility in organic solvents. Copper salts, such as copper tetrafluoroborate, etc., most of these materials are relatively expensive, which increases the manufacturing cost

In addition, waste organic matter will also cause environmental pollution problems.

(2) Due to the low conductivity of the pure organic electrolyte, the deposition efficiency of the film is low, so a small amount of water is usually added, which brings problems to the long-term stability of the electrodeposition solution

The unstable precipitation of the deposition solution will change the composition of the deposition solution, affect the quality of the deposited film, and replace the deposition solution to cause waste of raw materials

(3) Due to the low conductivity of the pure organic electrolyte, the electric field distribution on the deposition surface is uneven, and the uniformity and density of the film decrease.

(4) At present, most dyes (such as bipyridyl ruthenium) used in dye-sensitized solar cells are alcohol-soluble, and electrodeposition in organic electrolytes will lead to desorption of dyes and reduce cell efficiency.

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