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

An oxyhydroxide and electrolysis device technology, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, electrode, etc., can solve the problem of unsatisfactory energy conversion efficiency, limiting equipment industrialization, Slow kinetics and other issues, to achieve excellent catalytic performance, abundant reserves, and reduce catalytic costs

Inactive Publication Date: 2017-05-24
王艳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 inclu

Method used

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

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preparation example Construction

[0055] The preparation method of metal oxyhydroxide catalyst provided by the invention comprises the following steps:

[0056] Dissolving two or more metal salt precursors of 3d transition metal elements and at least one compound precursor of regulator elements in a first polar organic solvent to generate a first solution;

[0057] mixing traces of water in said first polar organic solvent to produce a second solution;

[0058] mixing the cooled first solution and the cooled second solution to form a gel within a preset time;

[0059] soaking the gel in a second polar organic solvent to remove unreacted metal salt precursors and compound precursors from the gel;

[0060] The gel is dried without annealing to produce an uncrystallized powder aerogel, which is the metal oxyhydroxide catalyst.

[0061] Wherein, the first polar organic solvent can be any organic solvent capable of dissolving the metal salt precursor and the compound precursor of the regulator element, including ...

Embodiment 1

[0072] Embodiment 1 FeCoW oxyhydroxide catalyst and preparation method thereof

[0073] This embodiment discloses a FeCoMo oxyhydroxide catalyst, that is, the FeCoMo oxyhydroxide in the FeCoMo oxyhydroxide catalyst contains two 3d transition metal elements, Fe and Co, and Mo is used as a regulator element. The FeCoMo hydroxyhydroxide In the oxide structure, the atomic covalent radii of Fe and Co differ from Mo by more than 6%, and Fe, Co and Mo are bridged by oxygen atoms (O) or hydroxyl groups (OH), achieving a homogeneous distribution at the atomic level. And through the interaction between adjacent Fe, Co and Mo, the adsorption energy of the oxygen evolution reaction intermediate can be adjusted.

[0074] This embodiment also discloses a preparation method of a FeCoMo oxyhydroxide catalyst, which is realized by a sol-gel method at room temperature, and specifically includes the following steps:

[0075] First, the anhydrous FeCl 3 (eg 0.9mmol), CoCl 2 (eg 0.9mmol) and Mo...

Embodiment 2

[0096] Embodiment 2 FeCoMoW oxyhydroxide catalyst and its preparation

[0097] The main component of the FeCoMoW oxyhydroxide catalyst in this embodiment is FeCoMoW oxyhydroxide, which contains two 3d transition metal elements, Fe and Co, and Mo and W as regulator elements. In the structure of the FeCoMoW oxyhydroxide, Fe The atomic covalent radii of Co and Mo and W differ by more than 6%, and Fe, Co and Mo and W are bridged by oxygen atoms (O) or hydroxyl groups (OH), achieving a homogeneous distribution at the atomic level, and by phase The interaction between adjacent Fe, Co and Mo, W can adjust the adsorption energy of oxygen evolution reaction intermediates.

[0098] The preparation method of the FeCoMoW oxyhydroxide catalyst in this example is basically the same as in Example 1, where only the type and amount of the precursor and the amount of trace water added need to be changed. Specifically, anhydrous FeCl 3 (eg 0.7mmol), CoCl 2 (eg 0.7mmol), WCl 6 (eg 0.7mmol) and...

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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...

Claims

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Application Information

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IPC IPC(8): B01J23/78B01J23/843B01J23/86B01J23/882B01J23/888B01J23/889C25B1/04C25B11/04
CPCB01J23/78B01J23/8435B01J23/864B01J23/882B01J23/8885B01J23/8892B01J23/8896C25B1/04C25B11/077Y02E60/36
Inventor 王艳
Owner 王艳
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