Iridium-based solid solution perovskite catalyst SrTi(Ir)O3 and application thereof in electrocatalytic water splitting for oxygen production

Abstract

The invention provides an iridium-based solid solution perovskite catalyst SrTi(Ir)O3 and application thereof in electrocatalytic water splitting for oxygen production, and belongs to the field of inorganic functional materials. A strontium source, organic polybasic acid, a titanium source, an iridium source, organic polylol and water are uniformly mixed in a water bath at different ratios, the mixed liquid is heated to evaporate water, then sufficient calcination is performed, and finally, acid treatment is performed to obtain the solid solution perovskite catalysts SrTi(Ir)O3 with differentiridium contents. By using classical perovskite SrTiO3 to induce the synthesis of SrIrO3, the usage of the noble metal, namely iridium, in a system is greatly reduced while the specific surface area of the SrIrO3 is increased. Meanwhile, titanium at a B site is capable of weakening the oxygen adsorption ability of active site iridium at the rest of B sites, also enabling the p zone center of oxygen to be much closer to a Fermi level, and finally enabling the performance of the catalyst for electrocatalytic oxidation of acidic water to be improved, wherein SrTi(Ir)O3(Ir-29%) has the best electrocatalytic activity for acidic water oxidation, and the current density can reach 10 mA / cm<2> with only 248mV overpotential.

Description

technical field [0001] The invention belongs to the field of inorganic functional materials, and in particular relates to an iridium-based solid solution perovskite catalyst and its application in electrocatalytic water splitting for oxygen generation. Background technique [0002] After entering the 21st century, environmental pollution and energy crisis have become two major problems facing all mankind. Therefore, the development of energy storage methods and the study of their conversion process have become the key to the development of clean and renewable energy. Oxygen evolution reaction (OER) is an important half-reaction in water splitting reactions, but its slow reaction kinetics greatly hinders its wide application. Usually, a large overpotential is needed to achieve the expected current density, which also leads to a serious loss of the overall efficiency of water splitting, especially in acidic water splitting systems. At the same time, most compounds with oxygen...

AI Technical Summary

Problems solved by technology

However, perovskite SrIrO 3 Not SrIrO 3 The most stable crystal phase, its metastability has brought great challenges to its synthesis, usually the method of high temperature and high pressure synthesis and template extension growth can be used to synthesize perovskite SrIrO 3 pure phase

At the same time, SrIrO 3 It is possible to further reduce the amount of Ir in

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