A polyhedral cobalt-iridium nanoparticle hydrogen evolution electrocatalyst and its plating solution and preparation method

Abstract

The invention discloses a polyhedral cobalt-iridium nanoparticle electrolytic water hydrogen evolution electrocatalyst and its plating solution and preparation method. The cobalt-iridium nanoparticle has octahedral and decahedral structures, the particle size is 10-250nm, and the chemical composition of cobalt and iridium in the particle is The components are evenly distributed, the iridium content is 45-95wt%, and the Tafel slope of the catalytic hydrogen evolution performance of the catalyst is 30-40mV / decade. Catalyst plating solution: cobalt salt is cobalt sulfate 5-200mmol / L, cobalt sulfamate 1-100mmol / L, iridium salt is sodium hexabromoiridium (IV) 10-150mmol / L, hexabromoiridium (III 1-100mmol / L of sodium nitrite, 0.1-500mmol / L of sodium bromide as conductive salt, 0.1-100mmol / L of sodium chloride, 1-20mmol / L of triammonium citrate as 1-20mmol / L of complexing agent, 1-10mmol of sodium tetraborate / L, other additives are benzotriazole 1-10mmol / L, thiourea 1-10mmol / L, sodium dodecylbenzenesulfonate 1-5mmol / L. The invention is prepared by an electrochemical deposition process, has high efficiency, can be applied to the surface preparation of conductive substrates with complex shapes, has controllable size and composition of nano particles, and has high catalytic performance and strong stability.

Description

technical field [0001] The invention belongs to the field of energy electrocatalysis, and in particular relates to a polyhedral cobalt iridium nanoparticle hydrogen evolution electrocatalyst, a plating solution and a preparation method thereof. Background technique [0002] Energy and environmental problems are becoming more and more serious in today's world. With the continuous consumption of fossil fuels, clean and renewable energy has received great attention. Generally, 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 has promoted the application prospects of electrocatalysts in electrocatalytic reduction of hydrogen production. At present, the most basic way to obtain hydrogen energy is the electrolysis of water, which is divided into oxyg...

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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

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