Method for producing hydrogen by utilizing ascorbic acid to promote glucose photoelectrocatalytic oxidation

An ascorbic acid, photoelectric catalysis technology, applied in electrodes, electrolysis process, electrolysis components, etc., can solve the problems of high overpotential and low utilization rate of electric energy, and achieve the effect of simple and portable electrode, simple operation and low cost.

Inactive Publication Date: 2015-07-22
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, hydrogen production by electrolysis of water often requires noble metals as catalysts, and is limited by high overpotential and low utilization rate of electric energy. Therefore, reducing the consumption of electric energy in the process of hydrogen production and improving the efficiency of hydrogen production will be the direction of researchers' future efforts

Method used

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  • Method for producing hydrogen by utilizing ascorbic acid to promote glucose photoelectrocatalytic oxidation
  • Method for producing hydrogen by utilizing ascorbic acid to promote glucose photoelectrocatalytic oxidation
  • Method for producing hydrogen by utilizing ascorbic acid to promote glucose photoelectrocatalytic oxidation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1 constructs photoelectrochemical fuel cell

[0030] The cadmium sulfide / ITO electrode of this embodiment is prepared by the following method:

[0031] (1) Prepare 50mL 0.50mol / L cadmium chloride, 10mL 1.0mol / L sodium thiosulfate aqueous solution and pH=2.0 hydrochloric acid aqueous solution;

[0032] (2) Using cyclic voltammetry electrodeposition technology, in the three-electrode system, the working electrode is ITO conductive glass, the counter electrode is a titanium electrode, the reference electrode is a saturated calomel electrode, and the electrolyte is the above-mentioned cadmium chloride, sulfo Sodium sulfate and hydrochloric acid aqueous solution mixed solution with a volume ratio of 1:5:44, the potential range of deposition is -0.3V~-0.9V, the number of circles is 100 circles, and the sweep speed is 0.05V s -1 ;

[0033] (3) Put the deposited electrode into an oven and dry at a constant temperature under the condition of 35-45° C. to obtain a ca...

Embodiment 2

[0036] Example 2 Ascorbic acid promotes the photocatalytic oxidation of glucose

[0037] To clarify the photocatalysis of ascorbic acid and ascorbic acid promoting glucose in the cadmium sulfide / ITO electrode in the photocatalytic fuel cell constructed in Example 1, the specific operation steps are as follows:

[0038] (1) The following four solutions were loaded into the anode cell to clarify the photocatalytic effect of cadmium sulfide / ITO electrode on ascorbic acid and ascorbic acid-promoted glucose. 1 is 0.5mol / L sodium sulfate solution (blank), 2 is 0.5mol / L sodium sulfate solution and 0.1mol / L glucose, 3 is 0.5mol / L sodium sulfate solution and 0.1mol / L ascorbic acid, 4 is 0.5mol / L L sodium sulfate solution, 0.1mol / L ascorbic acid and 0.1mol / L glucose.

[0039] (2) Use the electrochemical workstation to measure the open circuit potential of the photocatalytic fuel cell within 400s, and compare the effects of ascorbic acid and glucose on the open circuit potential. The re...

Embodiment 3

[0042] Embodiment 3 photocatalytic fuel cell performance

[0043] To the test of the photocatalytic fuel cell performance that embodiment 1 builds, concrete operation steps are as follows:

[0044] Adjust the resistance value of the resistance box connected between the anode and the cathode of the photocatalytic fuel cell, measure and calculate the power density and current density of the photocatalytic fuel cell with the change curve of the voltage, the result is as follows image 3 shown. At 0.18mW·cm -2 Under visible light irradiation, the short-circuit photocurrent density of the photocatalytic fuel cell constructed in Example 1 was 40 μA cm -2 , with a maximum power density of 10.1 μW cm at 0.40 V -2 , the photoelectric conversion efficiency reaches 5.6%, indicating that the constructed photocatalytic fuel cell has good battery performance and can realize the conversion of visible light energy and chemical energy into electrical energy at the same time.

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Abstract

The invention discloses a method for producing hydrogen by utilizing ascorbic acid to promote glucose photoelectrocatalytic oxidation based on the field of photoelectric chemical catalytic hydrogen production. A Nano cadmium sulfide modified electrode is used as a photo-anode, the ascorbic acid antioxidant is utilized to promote glucose photoelectrocatalytic oxidation, and a photocatalytic fuel cell with the visible photoelectric conversion efficiency of 5.6% is constructed and used for promoting evolution of hydrogen in a foamed nickel cathode. The method has the advantages of low cost and easy and simple operation, utilizes substances in living organisms as fuels, and greatly reduces the hydrogen evolution overvoltage.

Description

technical field [0001] The invention belongs to the field of photoelectrochemical catalytic hydrogen production, and in particular relates to a method for utilizing ascorbic acid to promote the photoelectric catalytic oxidation of glucose to produce hydrogen. Background technique [0002] Energy shortage and environmental pollution are the two main problems facing human development in the future, and hydrogen is favored by people because of its rich resources, high energy, clean and non-polluting, and wide range of uses; at the same time, the structure of human energy systems is positive It is estimated that from the middle of the 21st century, human society will gradually enter the era of hydrogen economy, so the development of hydrogen production technology plays a pivotal role. [0003] At present, the methods for producing hydrogen mainly include thermal cracking, solar photolysis, biological methods and water electrolysis. Hydrogen production by pyrolysis accounts for ...

Claims

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Application Information

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IPC IPC(8): C25B1/02C25B11/06C25B9/04
CPCC25B1/02C25B9/65C25B11/051
Inventor 梁兴辉刘俊辰李红
Owner SOUTH CHINA NORMAL UNIVERSITY
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