Preparing method of 3D-structuer Ni/rGO composite hydrogen evolution electrode

Abstract

The invention discloses a preparing method of a 3D-structuer Ni / rGO composite hydrogen evolution electrode. The preparing method mainly comprises the steps that graphite oxide is added into deionized water, and ultrasonic treatment is carried out to obtain graphene oxide dispersion liquid; nickel aminosulfonate, nickel chloride and ammonium chloride are added into the graphene oxide dispersion liquid, ultrasonic treatment is carried out to obtain a composite plating solution, a foam nickel substrate subject to ultrasonic and acidification treatment serves as an electro-deposition cathode, a pure nickel pipe serves as an electro-deposition anode, the strength G of a high gravity field is 350 g, the electro-deposition time ranges from 10 min to 100 min, the electro-deposition temperature is 45 DEG C, the electro-deposition current density is 3 A / dm<2>, and a composite coating obtained through preparing is washed with deionized water to be neutral and is dried; and the prepared Ni / rGO composite electrode has the considerable specific surface area, a uniform and stable coating structure and the excellent hydrogen evolution performance. When the current density is 100.0 mA / cm<2>, the hydrogen evolution reaction overpotential is reduced to 190 mV from 240 mV obtained through conventional electro-deposition preparing.

Description

technical field [0001] The invention belongs to the technical field of hydrogen production by electrolysis, in particular to a method for preparing a hydrogen evolution electrode. technical background [0002] Energy is the driving force for social development and the progress of human civilization. With the continuous development of science and technology and economy, human demand for energy continues to increase. Traditional primary energy sources such as coal, oil, and natural gas are facing a crisis of depletion. As a clean, efficient, and renewable green energy, hydrogen energy has attracted extensive attention from researchers, and it is regarded as the most ideal new energy to replace fossil energy. However, at present, more than 90% of hydrogen is produced by fossil fuels. This kind of hydrogen production method is not sustainable and cannot fundamentally solve the energy crisis. Hydrogen production by electrolysis of water is a sustainable hydrogen production metho...

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Problems solved by technology

[0005] Composite electrodeposition method is currently a relatively simple and mature method for preparing nickel-based composite hydrogen evolution materials. However, when hydrogen evolution composite materials are prepared by electrodeposition, hydrogen evolution reaction will inevitably occur on the cathode, and the generated hydrogen bubbles will be adsorbed on the surface of the electrode. If it is not detached in time, it will hinder the deposition process of metal ions reaching the electrode surface, causing defects such as micropores and microcracks in the coating; The moving direction of the charged graphene oxide under the action of the electric field force is to move away from the cathode, thus greatly reducing the content of graphene in the composite coating, and correspondingly it is difficult to obtain a Ni / rGO composite electrode with higher catalytic performance.

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