Preparation and application of Pd/TiO2 hydrogen evolution catalyst

Abstract

The invention discloses preparation and application of a Pd / TiO2 hydrogen evolution catalyst, which comprises the following steps: 1) cutting a titanium sheet with the thickness of 1mm into titanium sheets with the size of 10mm * 15mm, sequentially carrying out ultrasonic treatment in acetone (CH3COCH3), ethanol (C2H6O) and water (H2O) respectively for 10min, and airing in air; 2) polishing the air-dried titanium sheet in a polishing solution for 30 seconds, quickly cleaning the titanium sheet with water, and drying the titanium sheet in a drying oven of 60 DEG C for 10 hours after cleaning, the polishing solution being composed of nitric acid (HNO3), hydrofluoric acid (HF) and water (H2O) in a ratio of 4: 1: 5 (V: V: V); (3) reacting in an electrolyte of ethylene glycol (C2H6O2) and 3vol%water of 0.5 wt% ammonium fluoride (NH4F) under the condition of 50V voltage for 2 hours, obtaining a TiO2 nanotube after the reaction is finished, cleaning and drying, and annealing at 500 DEG C for2 hours; 4) depositing for 15 minutes under the current density of 20 mA / cm < 2 > in an electrolyte consisting of 1 mM of palladium chloride (PdCl2) and 0.1 M of sodium chloride (NaCl) to obtain Pd / TiO2; and 5) carrying out a hydrogen evolution electrochemical test. The overpotential of Pd / TiO2 prepared by the method provided by the invention in a hydrogen evolution reaction is positively shiftedby 588 mV compared with the overpotential (j = 10mA / cm < 2 >) of the TiO2 nanotube.

Description

Technical field [0001] The invention relates to a Pd / TiO 2 Preparation and application of hydrogen evolution catalyst. Background technique [0002] With the acceleration of the global industrialization process, the continuous consumption of fossil fuels has led to a gradual decrease in reserves, which will eventually lead to depletion, which has prompted mankind to search for other types of abundant new energy. Hydrogen energy has the advantages of high energy, wide sources and no pollution, and is an ideal substitute for fossil fuels. Hydrogen production by electrolysis of water is an important method for producing hydrogen, but it requires a catalyst with a large current density at a low potential. This type of catalyst is expensive, such as Pd, which limits the development of hydrogen production by electrolysis. People are required to find catalysts with high and stable catalytic activity and inexpensive or catalysts that reduce the amount of precious metals. [0003] TiO 2 N...

AI Technical Summary

Problems solved by technology

Hydrogen production by electrolysis of water is an important method to produce hydrogen, but it requires a catalyst with a large current density at a low potential, and this type of catalyst is expensive, such as Pd, which limits the development of hydrogen production by electrolysis of water. People are required to look for catalysts with high catalytic activity, stability and low cost or catalysts that reduce the amount of precious metals

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