Polyhedral cobalt iridium nano particle electrolytic hydrogen evolution catalyst and plating solution formula and preparation method thereof

Abstract

The invention discloses a polyhedral cobalt iridium nano particle electrolytic hydrogen evolution catalyst and a plating solution formula and a preparation method thereof. The cobalt iridium nano particles have octahedral and octahedral structures, the particle size is 10-250 nm, the chemical components of cobalt and iridium in the particles are uniformly distributed, the iridium content is 45-95wt%, the catalytic hydrogen evolution performance tower fresnel slope of the catalyst is 30-40 mV / decade. The plating solution formula of the catalyst is that the cobalt salt is 5-200 mmol / L of cobaltsulfamate and 1-100 mmol / L of cobalt sulfamate; the iridium salt is 10-150 mmol / L of hexa-bromo-iridium (IV) acid sodium and 1-100 mmol / L of hexa-bromo-iridium (III) acid sodium; the conductive saltis 0.1-500 mmol / L of sodium bromide and 0.1-100 mmol / L of sodium chloride; the complexing agent is 1-20 mmol / L of triammonium citrate and 1-10 mmol / L of sodium tetraborate l; and the other additives are 1-10 mmol / L of benzotriazole, 1-10 mmol / L of thiourea and 1-5 mmol / L of sodium dodecyl benzene sulfonate. The preparation method is prepared by an electrochemical deposition process, is high in efficiency and can be applied to the surface preparation of a conductive substrate with a complicated shape, and the size of the nano particles and the components of the nano particles are controllable;in addition, the catalytic performance is high, and the stability is high.

Description

technical field [0001] The invention belongs to the field of energy electrocatalysis, in particular to a polyhedral cobalt iridium nanoparticle hydrogen evolution electrocatalyst and a plating solution formulation and preparation method thereof. Background technique [0002] The energy and environmental problems in today's world are becoming more and more serious. With the continuous consumption of fossil fuels, clean and renewable energy has received great attention. Usually, a series of renewable energy sources such as solar energy and wind energy can be converted into the form of electricity. Hydrogen is considered to be the most ideal substitute for fossil fuels due to its high combustion efficiency and zero pollution. The demand for hydrogen energy promotes the application prospect of electrocatalysts in electrocatalytic reduction to hydrogen production. At present, the most basic way to obtain hydrogen energy is water electrolysis, which is divided into oxygen evolut...

AI Technical Summary

Problems solved by technology

However, the preparation method of this type of alloy catalyst is relatively complicated, and the amount of noble metal Ir in the additive is large, and the Ir inside the structure has not been fully utilized.

Tang Zhenghua et al. designed core-shell cobalt-iridium nanoparticles in the published patent "Preparation of Nitrogen-doped Porous Carbon Coated Cobalt-Iridium Core-Shell Structure Nanoparticles and Their Application in Catalytic Water Splitting", which were prepared by electroless plating preparation technology Cobalt-iridium core-shell structure nanoparticles can be used in electrocatalytic hydrogen evolution and oxygen evolution reactions, but compared with the present invention, the catalyst takes too long to make, consumes more energy, has cumbersome steps, and has a higher hydrogen evolution overpotential

Images