Metal-free sulfur-doped carbon material hydrogen peroxide reduction catalyst and preparation method

Abstract

The invention provides a metal-free sulfur-doped carbon material hydrogen peroxide reduction catalyst and a preparation method. The preparation method is characterized by comprising the following steps: putting benzyl disulfide and a carbon material into sufficient ethanol according to a mass ratio of (5-6): (95-94), ultrasonically treating the mixture for 0.5 to 1 hour, centrifuging the mixture to remove the upper substances, vacuum drying the mixture for 5 to 6 hours at the temperature of 50 to 60 DEG C to form solid powder, putting the solid powder into a high-temperature furnace to be reacted for 7 to 8 hours at the temperature of 800 to 900 DEG C under the protection of nitrogen, cooling the solid powder to room temperature under the protection of nitrogen to obtain the sulfur-doped carbon material hydrogen peroxide reduction catalyst. The sulfur is used for substituting carbon to form S-C bonds to form an activity center of the electroreduction of H2O2. The source of the raw material is wide, and the price is low. Not only is the electrochemical activity high, but also the stability is high, and the toxicity resistance is high. The hydrolysis reaction of the H2O2 can be prevented, and the oxygen can be reduced. The electric oxidation performance and utilization rate of the H2O2 can be greatly improved.

Description

technical field [0001] The invention relates to a hydrogen peroxide electroreduction catalyst. The invention also relates to a preparation method of the hydrogen peroxide electroreduction catalyst. Background technique [0002] h 2 o 2 The fuel cell as an oxidant has the advantages of high electrochemical activity, easy storage, transportation and operation, and can replace O in an oxygen-free environment such as space or underwater. 2 , especially in several representative low-temperature fuel cells has become a current research hotspot. The use of hydrogen peroxide instead of oxygen as the oxidant has the following advantages: the reduction of oxygen is a 4-electron process with a slow kinetic rate, while the reduction of hydrogen peroxide is a 2-electron process with a lower activation overpotential and thus has a faster Reaction kinetic rate; hydrogen peroxide is a liquid at room temperature, convenient for storage and transportation, especially suitable for space, u...

AI Technical Summary

Problems solved by technology

Both noble metal and transition metal catalysts have two problems, one is poor electroreduction performance, and the other is hydrolysis to oxygen evolution, see (2) formula

This leads to H 2 o 2 Problems of low electroreduction performance and low utilization