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Method for preparing metal/metal oxide composite electrocatalyst

An electrocatalyst and oxide technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of rare precious metal reserves, high price, limited application, etc. problems, to achieve excellent catalytic activity, high controllability, and good repeatability.

Active Publication Date: 2019-06-21
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the defects in the prior art, the present invention aims to provide a method for preparing a metal / metal oxide composite electrocatalyst to solve the problems of rare metal reserves, high price, and limited application in the field of catalytic electrolysis of water to prepare hydrogen

Method used

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  • Method for preparing metal/metal oxide composite electrocatalyst
  • Method for preparing metal/metal oxide composite electrocatalyst
  • Method for preparing metal/metal oxide composite electrocatalyst

Examples

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Embodiment 1

[0029] This embodiment provides a method for preparing metal / metal oxide (NiCo / NiCo 2 o 4 ) method of composite electrocatalyst, specifically:

[0030] (a) NiCo growth on carbon paper by hydrothermal method and heat treatment 2 o 4 Materials, specifically: Soak 2×3cm carbon paper in dilute hydrochloric acid for 1 hour, then rinse with deionized water repeatedly, dry for use; weigh 1 mmol NiCl 6 ·6H 2 O, 2 mmol CoCl 2 ·6H 2 O, 2 mmol NH 4 F and 5 mmol urea were dissolved in 60mL deionized water, stirred for 30min, transferred to a 100mL reactor, and put into cleaned carbon paper; the reactor was placed in an oven at 120°C for 6h, and naturally After cooling to room temperature, the NiCo precursor / carbon paper (hydrothermal product) was washed with deionized water, and dried overnight in an oven at 60 °C; the NiCo precursor / carbon paper was heated to 420 °C in air and kept for 2 hours to obtain NiCo 2 o 4 / carbon paper composite material;

[0031] (b) A two-electrode...

Embodiment 2

[0035] This embodiment provides a method for preparing NiCo / NiCo 2 o4 The specific steps of the composite electrocatalyst method are basically the same as those in Example 1, except that in step (b), the charging and discharging current is 3 mA, the cycle is 1 cycle, and the charging and discharging voltage ranges from 0.5 to 2.8 V. The obtained material has excellent oxygen evolution ability under alkaline conditions, at 10 mA / cm -2 The overpotential at the current density is 303 mV.

Embodiment 3

[0037] This embodiment provides a method for preparing NiCo / NiCo 2 o 4 The specific steps of the composite electrocatalyst method are basically the same as those in Example 1, except that in step (b), the charging and discharging current is 5 mA, the cycle is 1 cycle, and the charging and discharging voltage ranges from 0.8 to 2.8 V. The obtained material has excellent oxygen evolution ability under alkaline conditions, at 10 mA / cm -2 The overpotential at the current density is 350 mV.

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Abstract

The invention relates to a method for preparing a metal / metal oxide composite electrocatalyst. The method comprises the following steps: (a), growing a metal oxide on a conductive carrier; (b), assembling the metal oxide used as a working electrode, a lithium sheet used as a counter electrode and electrolyte to form a lithium ion half cell; circularly charging and discharging until the dischargingstate is the final state; (c), taking out a product processed by the step (b), washing, and drying. According to the method, lithium ion induced phase transformation reaction is carried out to transform the metal oxide into a metal phase, so that the obtained metal / metal oxide composite material is rich in interface, few in defects and outstanding in conductivity; when the metal / metal oxide composite material is treated as an electrolyzing water catalyst, the catalyzing activity bit density is greatly increased; the substance transferring in the electro-catalysis reaction is speed up, and thus the catalyzing activity is outstanding. The method is generally suitable for a plurality of metal oxides; compared with an existing composite metal oxide synthesizing method, the method is simple, easy to carry out, low in price, high in efficiency, high in controllability, and high in repeatability.

Description

technical field [0001] The invention belongs to the field of catalysts and relates to a composite catalyst, in particular to a method for preparing a metal / metal oxide composite electrocatalyst. Background technique [0002] With the increasing energy crisis and environmental pollution caused by fossil fuels, the development and utilization of various clean and renewable energy sources has attracted widespread attention. As a secondary energy source, hydrogen is regarded as the most ideal energy carrier due to its clean, non-polluting, high-efficiency, storable and transportable advantages. Hydrogen production by electrolysis of water is considered to be an important part of modern clean energy technology due to the advantages of high product purity, no pollution, and abundant materials. [0003] However, there are problems of high energy consumption and low electrolysis efficiency in the electrolysis process of water, which limit the further development of this technology....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J23/889
Inventor 王显福王超晏成林
Owner SUZHOU UNIV
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