Method for preparing copper tungstate photo-anode film

Abstract

The invention relates to a method for preparing a copper tungstate photo-anode film. The method comprises the steps of (1) preparing organic solutions containing copper and tin, wherein the solutions are ethylene glycol monomethyl ether with the dissolution of copper nitrate trihydrate and the concentration of 0.04-0.08mol / L and ethylene glycol monomethyl ether with the dissolution of stannous chloride dihydrate and the concentration of 0.04-0.08mol / L, (2) mixing (5-x) ml copper solution and X ml tin solution prepared in the step (1) to be uniform, (3) adding ammonium metatungstate with an equimolar amount, adding 0.1-0.7ml concentrated nitric acid and 10 to 100mg ammonium nitrate, stirring the solution to be clear to obtain a precursor solution, (4) using a pipettor to take a certain amount of precursor solution prepared in the step (3), dripping the solution on a fluorine doped tin oxide conductive substrate to be heated for 20 min on a heating plate of 70 DEG C, and removing an organic solvent, and (5) burning the fluorine doped tin oxide conductive substrate covered by a film of precursor in a muffle furnace with the temperature of 550+ / -50 DEG C, and taking the substrate out to be naturally cooled to a room temperature to obtain a corresponding tin doped copper tungstate film.

Description

technical field [0001] The invention relates to a method for preparing a copper tungstate film and using tin element doping to increase carrier concentration. Background technique [0002] With the increasing demand for energy consumption in modern society, the shortcomings of traditional fossil energy are also increasingly magnified, and the environmental pollution problems caused by its limited total amount and use process need to be solved urgently. Finding alternatives to traditional fossil energy has long been considered by many The country is on the agenda. Using photoelectrochemical cells to directly convert highly dispersed, volatile, and difficult to store and transport solar energy into high energy density and stable clean hydrogen energy is expected to solve the current energy problem. However, the conversion efficiency of current photoelectrochemical cell water splitting systems is limited by the low photocurrent density and high turn-on potential of photoanode ...

AI Technical Summary

Problems solved by technology

[0003] Copper tungstate can absorb visible light near 550nm, and its theoretical solar-to-hydrogen energy conversion efficiency can reach 10%, but the actual solar-to-hydrogen energy conversion efficiency is very low

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