Carbon-doped copper nano-oxide self-supporting electrode, its preparation method and its catalytic method for splitting water

Abstract

The invention discloses a preparation method and application of a carbon-doped copper nano-oxide self-supporting electrode. The preparation method is disclosed as follows: soak the copper wire with black copper oxide on the surface in an alkaline solution of sodium citrate (0.1mol / L NaOH) at 50°C, and increase the temperature by 5°C every 15 minutes until 90°C , after the water was evaporated to dryness, the sample was taken out, placed in an autoclave, and reacted at 180°C for 12 hours to obtain a self-supporting carbon-doped copper composite catalyst CW@C / CuO / Cu 2 O / Cu(OH) 2 NPs. It was confirmed by field emission-energy spectroscopy (FESEM-EDS) that carbon has been successfully doped into copper nano-oxides, and the good conductivity and stability of carbon are very important for CW@CuO / Cu 2 O / Cu(OH) 2 NPs materials were improved. In the process of catalytic water splitting to produce hydrogen and oxygen, the electrode shows good stability and high current density. When the potential is 0V and 0.5V respectively, the reduction and oxidation current densities can reach 800mA cm ‑2 . The catalytic current density of the electrode after doping is 1.5 to 3 times that of the electrode without carbon material.

Description

technical field [0001] The invention belongs to the technical field of electrocatalysis, and in particular relates to a carbon-doped copper nano-oxide self-supporting electrode, a preparation method thereof and a method for catalytically decomposing water. Background technique [0002] With the gradual reduction of fossil fuel resources and their pollution to the environment, it is very important to develop clean, high-energy-density renewable energy. Water is the most abundant compound on the earth. Hydrogen has high energy density, and the combustion product is water, which is non-polluting. Therefore, storing energy by reducing hydrogen atoms in water in nature to hydrogen gas is the most attractive energy storage method. However, at present, hydrogen and oxygen are produced industrially by electrolyzing water, regardless of whether the electrode material is a noble metal or a transition metal, the required potential is above 1.6V. The disadvantages of the use of transi...

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Problems solved by technology

However, the catalytic current density of this electrode is low, and the current efficiency is low in the process of electrolyzing water to produce hydrogen and oxygen.

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