Silver-copper nano-alloy air electrode catalyst layer and deposition method thereof

Abstract

The invention relates to a silver copper nano alloy air electrode catalyst and a deposition method thereof. The silver copper nano alloy air electrode catalyst layer is in a film shape and consists of 50 to 90 percent of Ag and 10 to 50 percent of Cu, wherein the percentage is the atomic percentage. The silver copper nano alloy is directly deposited onto a foam nickel current collector electrode by adopting a pulse laser deposition method, a silver copper single-phase solid solution alloying cathode catalyst layer is prepared to form a catalytic layer which does not contain carbon and contains Teflon. The micro tissue of the silver copper nano alloy air electrode catalyst layer is formed by dispersing silver copper nano alloy particles in a copper amorphous substrate, the average nano particle granularity is 2.5nm to 2.8nm, and the distribution granularity is 1nm to 5nm. The open-circuit voltage of the silver copper nano alloy film in a primary zinc-air battery is 1.42V to 1.44V, the power density can reach up to 86.3mW.cm<-2> and is improved by 20 percent, and the charging-discharging circulating efficiency in a secondary zinc-air battery is more than 41 percent.

Description

technical field [0001] The invention belongs to the field of rechargeable metal-air batteries and renewable fuel batteries, in particular to a catalyst layer used on an oxygen electrode and an air electrode in the battery and a preparation method thereof. Background technique [0002] In recent years, due to the energy and environmental crisis, traditional waste batteries have caused great pollution to the environment, and renewable energy such as photovoltaics and wind energy have intermittent problems, making the development of new renewable energy devices the focus of research in the energy field. Under natural conditions, metal-air batteries and fuel cells can oxidize metals or fuels on the anode to generate electrons, and at the same time reduce oxygen on the cathode catalyst layer to produce hydroxide ions or water, and convert chemical energy into electrical energy. Since the anode metal or fuel oxidation is a spontaneous process, the catalytic efficiency of the oxyge...

AI Technical Summary

Problems solved by technology

[0005] (1) Regarding the composition of the air electrode catalyst, the silver element of the silver-based alloy catalyst in the current literature does not have the transition metal elements that are conducive to the alloying of Ag and the formation of a stable catalyst layer with copper and manganese.

At the same time, the d orbital center saturation of pure silver is low, the adsorption of oxygen is weak, and the catalytic activity of oxygen reduction reaction is weak. Silver needs suitable metal elements to dope and develop new silver-based alloy nanocatalysts to improve its catalytic activity. .

[0006] (2) In the preparation process of the air electrode catalytic layer, the synthesis of silver alloy electrocatalysts in the current literature involves manual operation and solution process, which does not have the characteristics of making the battery preparation process automatic. At the same time, the process is difficult to control, which is not conducive to the modularization of parameter settings. The energy density and cycle life of the electrocatalysts prepared in the chamber stage and their prototype batteries cannot be expected to be achieved in mass-produced batteries.

[0007] (3) On the carrier of the air electrode catalyst layer, silver-based alloys currently use a large number of various forms of carbon (such as acetylene black and conductive graphite) as catalyst carriers. When the air battery is charged, the nickel foam on the current collector of the air electrode will Oxygen is produced, and the new ecological oxygen will strongly corrode the carbon of the air electrode, causing the Ag-based catalytic active components to fall off. After a period of use, the catalytic activity of the air electrode will be significantly reduced

Images