Iron-phosphorus compound modified electrode with electrocatalytic oxygen evolution performance and preparation method

Abstract

The invention relates to an iron-phosphorous compound modified electrode with electro-catalysis oxygen release performance and a preparation method thereof. The preparation method comprises the following steps that 1, preparation is conducted, specifically, an appropriate quantity of pretreated electrode materials and sodium hypophosphite are weighed, and the electrode materials and the sodium hypophosphite are placed at the two ends of a high-temperature reacting device according to a certain mass ratio; and 2, phosphating is conducted, specifically, heat preservation is conducted for a period of time under the nitrogen atmosphere and the certain temperature condition, and after washing and drying, the iron-phosphorous compound modified electrode with the electro-catalysis oxygen releaseperformance is obtained. According to the iron-phosphorous compound modified electrode with the electro-catalysis oxygen release performance and the preparation method thereof, through the one-step direct low-temperature phosphating method, the iron-phosphorous compound modified electrode is prepared, preparation is easy, needed raw materials are low in price and easy to obtain, and industrial application is easy to achieve; and additionally, compared with the prior art, the prepared iron-phosphorous compound modified electrode has the same stability under the 10M KOH and meanwhile has higherelectrocatalytic activity, and thus industrial production is greatly boosted.

Description

technical field [0001] The invention belongs to the technical field of electrochemical catalysis, and relates to an iron-phosphorus compound modified electrode and a preparation method thereof. The iron-phosphorus compound modified electrode has excellent electrocatalytic oxygen evolution (OER) performance, and can be applied to the field of hydrogen production by electrolysis of water. Background technique [0002] With the development of the global economy, the consumption of traditional fossil energy has caused many problems such as energy shortage and environmental pollution. Therefore, renewable clean energy will surely become the mainstream of energy supply. As one of the clean and efficient new energy sources, hydrogen energy has become a hot spot in current research and development. Various hydrogen production methods currently developed include traditional steam reforming, photolysis of water, and electrolysis of water. Among them, the hydrogen production method of...

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Problems solved by technology

[0004] However, the catalyst-modified electrode prepared by the above research has the following problems: 1) The hydrothermal synthesis method under high temperature and high pressure is used in the preparation process, which requires a reaction kettle resistant to high temperature, high pressure and chemical corrosion, and the conditions are relatively harsh and the cost is high; 2) It is necessary to prepare the oxide or hydroxide precursor in advance, and then prepare the iron phosphide modified electrode by low-temperature phosphating. The steps are cumbersome and the cost is high, which is not conducive to the realization of industrial production; There is an internal interface between them, which to a certain extent inhibits the electron transport between the iron phosphide and the electrode during the hydrogen production process, increases the overpotential of the oxygen evolution reaction and reduces its reactivity, and at the same time, a large number of bubbles generated during the oxygen evolution process will lead to Catalyst detachment, which reduces catalyst stability

However, this method still needs to prepare the oxide precursor in advance, so there are still problems of cumbersome steps and long time consumption, which is not conducive to the realization of industrial production

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