Preparation of nitrogen-doped platinum-nickel/carbon electrochemical catalyst for catalytic oxidation on ethanol through one-step method

Abstract

The invention discloses a preparation method of a carrier by using saccharide and urea and Pt-Ni / NC catalyst with high performance for ethanol oxidation through hydrothermal synthesis on the carrier and a metal salt solution in a one-step method, and particularly relates to preparation of ethanol oxidation-electro-catalyst which is obtained by synthesizing sucrose (glucose) into a carbon carrier,adding the urea to realize doping of nitrogen, performing hydrothermal reaction and a metal salt solution and performing synthesis to obtain the catalyst, and then carbonizing the urea. The preparation method comprise the following main steps: firstly, adding the sucrose (glucose) and the urea into deionized water and then performing mixing to obtain a mixed solution; mixing a nickel chloride aqueous solution with a chloroplatinic acid aqueous solution according to a mass ratio to obtain a mixture; then adding the mixture into the mixed solution; regulating pH by using a sodium hydroxide aqueous solution, then performing ultrasonic treatment to enable the mixed solution to be evenly mixed; finally, putting into a polytetrafluoroethylene high-temperature high-pressure reaction kettle and carrying out hydrothermal reaction; cooling to a room temperature, then performing suction filtration and washing on the reacted solution to obtain a product; drying the obtained product in a vacuum drying box; carbonizing the obtained powder in a tubular furnace at a high temperature to obtain the spherical Pt-Ni / NC catalyst. Under an acidic condition, the Pt-Ni / NC catalyst prepared by the method disclosed by the invention has strong electro-catalytic oxidation activity and stability on ethanol, and the current density of the Pt-Ni / NC catalyst can reach 500mA.mg-1Pt; moreover, the Pt-Ni / NC catalyst is environmentally friendly and is free of pollution, and is relatively low in cost; therefore, the catalyst is a high-performance catalyst which can be directly applied to anodes of direct ethanol fuel cells.

Description

technical field [0001] The invention relates to a preparation method of an ethanol oxidation catalyst, in particular to a method for preparing a metal salt chloroplatinic acid (H 2 PtCl 6 ) and nickel chloride (NiCl 2 ) A new method for one-step synthesis of ethanol oxidation catalysts with high performance. Background technique [0002] The continuing expectations of researchers around the world for renewable and clean energy sources do not stop there, increasingly dwindling in the face of high levels of pollution from the combustion of petroleum derivatives. The most interesting clean power source is the direct alkaline alcohol fuel cell. This type of battery uses liquid alcohol as fuel (such as methanol, ethanol and ethylene glycol). Alcohol replacing hydrogen as a fuel faces problems in production, handling, storage and distribution. Direct alcohol fuel cells (DAFCs) represent the ideal energy converter of the chemical energy of alcohol directly into electrical ener...

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Problems solved by technology

However, this method needs to use concentrated sulfuric acid and concentrated nitric acid to prepare graphene, which is harmful to the environment, and the experimental operation is unsafe, and the reaction conditions are harsh.

For carbon nanotubes, it is also necessary to use strong acid for treatment, because if metals are loaded on carbon nanotubes, carbon nanotubes need to be cleaned to remove impurities and other metals inside, and the experimental operation is also cumbersome.