Metal oxyhydroxide catalyst, electrode, preparation methods of catalyst and electrode and electrochemical electrolysis unit

Abstract

The invention provides a metal oxyhydroxide catalyst, an electrode, preparation methods of the catalyst and the electrode and an electrochemical electrolysis unit. In addition to oxygen and hydrogen, the metal oxyhydroxide further comprises two or more than two 3d transition metal elements and at least one regulator element, wherein the atoms of the 3d transition metal elements and atoms of the regulator elements are distributed in a common oxyhydroxide skeleton, and are connected onto the atoms of the regulator elements through bridging oxygen or bridging hydroxyl, and homogeneous phase distribution is realized on the atomic level; and moreover, according to the interaction among the adjacent 3d transition metal atoms and the interaction between the adjacent 3d transition metal atoms and the regulator element atoms, the adsorption energy of an intermediate in an oxygen evolution reaction can be regulated. The metal oxyhydroxide catalyst is different from a mixed metal oxide catalyst crystallized in the prior art, so that the efficiency of carrying out the oxygen evolution reaction through electrolytic water can be improved. Meanwhile, the 3d transition metal atoms have rich reserves on the earth, so that the catalytic cost can be reduced.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a metal oxyhydroxide catalyst, an electrode, a preparation method and an electrochemical electrolysis device. Background technique [0002] Using renewable energy such as solar energy, wind energy, and tidal energy to generate electricity is the most environmentally friendly way to solve the world's energy problems, but there is also a common problem-the inability to provide continuous and stable electricity. The storage of electrical energy as chemical energy by electrolysis of water or electroreduction of carbon dioxide is a promising solution. [0003] The water electrolysis reaction can be divided into two half-reactions, the negative electrode hydrogen evolution reaction (HER) and the positive electrode oxygen evolution reaction (OER), while the electrolytic reduction of carbon dioxide reaction can be divided into negative electrode carbon dioxide molecules into hydrocarbo...

AI Technical Summary

Problems solved by technology

The positive electrode of the two electrolytic cells is the oxygen evolution reaction, that is, OER: 2H 2 O=4H + +O 2 ↑+4e. This reaction involves the transfer of four electrons. It is a kinetically slow reaction. There are a variety of high-energy intermediate states in the process. It is one of the most difficult steps. Even if the most efficient noble metal catalyst is used, For example, single metals include Ni, Ag, Co, Hg, Pt, etc., and mixed catalysts include Ag-Hg, Ag-Ni, Pt-Fe, etc., which are not only costly, but also require a high voltage to drive the electrolysis of water. The conversion efficiency is also unsatisfactory, and this problem also exists in the electrolytic reduction of carbon dioxide reaction, thus greatly limiting the industrialization of equipment including fuel cells and electrolytic cells

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