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

A technology of hydrogen peroxide and sulfur doping, applied in physical/chemical process catalysts, chemical instruments and methods, nanotechnology for materials and surface science, etc., can solve poor electroreduction performance, low electroreduction performance, Low utilization rate and other problems, to achieve the effect of improving electro-oxidation performance and utilization rate, good stability, and reducing the generation of oxygen

Active Publication Date: 2016-09-14
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A glassy carbon electrode coated with sulfur-doped carbon nanotubes was used as the working electrode, the carbon rod was used as the counter electrode, and Ag / AgCl was used as the reference electrode. 2 O 2 In the solution of -0.4V vs. Ag / AgCl, after running for 10000S, the chronocurrent density reaches 4.8mA / cm 2 . H 2 O 2 No bubbles escaped during electroreduction.

Embodiment 2

[0021] Using sulfur-doped carbon nanotubes coated on carbon cloth as H 2 O 2 For the cathode of direct electroreduction, 3 mol / L KOH was used as the catholyte; Nafin-115 proton exchange film was used as the diaphragm; the nano-Pt supported on foam nickel was used as the anode, and 3 mol / L KOH was used as the anolyte solution, 1 mol / L L sodium borohydride as fuel; when H 2 O 2 The concentration is 0.6mol / L -1 , KOH concentration is 3mol / L -1 The maximum power density of the battery is 65mW / cm -2 . H 2 O 2 No bubbles escaped during electroreduction.

Embodiment 3

[0023] Using sulfur-doped carbon nanotubes coated on carbon cloth as H 2 O 2 For the cathode of direct electroreduction, 3 mol / L KOH was used as the catholyte; Nafin-115 proton exchange film was used as the diaphragm; the metal Al plate was used, and 6 mol / L KOH was used as the anolyte; 2 O 2 The concentration is 0.6mol / L -1 , KOH concentration is 3mol / L -1 The maximum power density of the battery is 47mW / cm -2 . H 2 O 2 No bubbles escaped during electroreduction.

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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 present 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 As an oxidant, fuel cells have the advantages of high electrochemical activity, easy storage, transportation and operation, etc., and can replace O in an oxygen-free environment such as space or underwater. 2 , especially the research in several representative low-temperature fuel cells has become a current research hotspot. Using hydrogen peroxide to replace oxygen as the oxidant has the following advantages: oxygen reduction is a 4-electron process with slow kinetic rates, whereas hydrogen peroxide reduction is a 2-electron process with lower activation overpotential and therefore faster Reaction kinetic rate; Hydrogen peroxide is a liquid at room temperature, which is convenient for storage and transportation, especially suitabl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90B01J27/20
CPCB82Y30/00B82Y40/00H01M4/90Y02E60/50
Inventor 王贵领王滨刘继军曹殿学蔡庄
Owner HARBIN ENG UNIV
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