Preparation method of iron-nickel electro-catalyst and oxygen evolution application thereof under high current density

Abstract

The invention belongs to the technical field of electro-catalysis, and particularly relates to a preparation method of an iron-nickel electro-catalyst and an oxygen evolution application thereof underhigh current density. Cheap ferric nitrate is used as a main raw material of the catalyst, ultrathin Fe and Ni nano sheets can grow on foamed nickel in-situ only through a simple hydrothermal reaction for 3 hours, and the average thickness of the obtained nano sheets is only 4.5 nm, so that the catalyst has an ultra-large specific surface area, and rich active sites are exposed. The preparation process of the catalyst is simple, the raw materials are cheap and easily available, and the production cost is greatly reduced. Meanwhile, the catalyst shows excellent oxygen evolution performance under an alkaline condition; over-potentials of 195 mV, 280 mV and 307 mV can drive current density of 10 mA/cm<2>, 500 mA/cm<2> and 1000 mA/cm<2>, meanwhile, the catalyst can stably operate for at least80 hours under a current density of 1000 mA/cm<2>, and the catalyst is an excellent catalyst meeting actual industrial production conditions.

Description

Technical field [0001] The invention belongs to the technical field of electrocatalysis, and specifically relates to a preparation method of an iron-nickel electrocatalyst and its application of oxygen evolution under a large current density. Background technique [0002] With the accelerated consumption of non-renewable fuels such as oil and natural gas, hydrogen energy has attracted more and more attention as a new energy source with high energy density and pollution-free. Electrolyzed water provides a convenient and effective method for producing high-purity hydrogen. However, the oxygen evolution reaction (OER) involving a multi-step proton coupled transfer process that occurs at the anode has become a bottleneck in water electrolysis technology, thus greatly limiting the efficiency of hydrogen production. Noble metal Ru and Ir oxide (RuO 2 And IrO 2 ) It shows high catalytic performance for OER, but it is difficult to be applied on a large scale due to the limitation of res...

AI Technical Summary

Problems solved by technology

However, their main hurdle is that most of the catalysts mentioned above are nanoscale powders, which require the use of Nafion or Teflon to attach the catalysts to the electrodes.

However, the introduction of binders largely affects the mass transfer and energy conversion processes

At the same time, the OER catalysts prepared by the prior art only operate at lower current densities (2 ) has good catalytic performance, but under high current density, the rapid escape of the bubbles will cause the catalyst to fall off and deactivate, which is far from reaching the electrolytic water conditions required by the industry.

At the same time, most of the existing technologies require harsh preparation conditions, and the preparation process is time-consuming and labor-intensive.

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