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Hydrogen storage device for preparing sodium borohydride by reducing sodium metaborate based on jet electrochemical device

The technology of sodium metaborate and sodium borohydride is applied in the field of hydrogen storage devices for preparing sodium borohydride, which can solve the problems of low electrolysis efficiency, large power consumption, poor mass transfer efficiency, etc. Low cost and improved conversion rate

Pending Publication Date: 2021-06-25
XUZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the problems of poor mass transfer efficiency, large power consumption and low electrolysis efficiency of the devices used in the electrolytic reduction of sodium metaborate to prepare sodium borohydride in the prior art, in order to improve the mass transfer conditions and reduce the partial The influence of borate ions to electromigration to the anode, the present invention designs a hydrogen storage device based on the reduction of sodium metaborate to prepare sodium borohydride with a jet electrochemical device, which consists of a power supply, a constant temperature magnetic stirrer, a peristaltic pump, and a nozzle, and the power supply mode DC electrolysis is used, the negative pole of the power supply is applied to the cathode, and the positive pole of the power supply is applied to the nozzle

Method used

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  • Hydrogen storage device for preparing sodium borohydride by reducing sodium metaborate based on jet electrochemical device
  • Hydrogen storage device for preparing sodium borohydride by reducing sodium metaborate based on jet electrochemical device
  • Hydrogen storage device for preparing sodium borohydride by reducing sodium metaborate based on jet electrochemical device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]The constant temperature magnetic stirrer is adjusted to 25 ℃ constant, in the 300ml beaker, add the NaOH solution of 50ml 1mol / L and the sodium metaborate mixed solution of 0.5mol / L, put into the constant temperature magnetic stirrer and heat for 10 minutes. Use a rectangular lead sheet cut into 2×3cm and a thickness of 0.1mm as the cathode, and use a mobile power supply to apply the negative electrode to the lead sheet. One end of the peristaltic pump hose is connected to the nozzle, and the positive electrode of the power supply is applied to the nozzle; the other end of the hose is placed in a beaker. Adjust the delivery direction of the peristaltic pump to forward the electrolyte. Make the cathode close to the nozzle during electrolysis. At 25°C, DC power supply was used, the flow rate of the electrolyte was set to 0.28ml / s, and the electrolysis time was 30min, and sodium borohydride was electrolyzed at 2.5, 3, 3.5, 4, and 4.5v respectively.

Embodiment 2

[0038] Using the same raw materials and steps as in Example 1, direct current electrolysis at constant temperature (25°C) and constant voltage (3v), and electrolysis for 30 minutes at flow rates of 0.28ml / s, 0.34ml / s, and 0.37ml / s respectively. Sodium borohydride.

Embodiment 3

[0040] Using the same raw materials and steps as in Example 1, the test was performed at a DC voltage of 3v, the flow rate v: 0.38ml / s, and the electrolysis time was 60, 90, 120, and 150min.

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Abstract

The invention discloses a hydrogen storage device for preparing sodium borohydride by reducing sodium metaborate based on a jet electrochemical device, the hydrogen storage device comprises an electrolysis device and an electrolyte circulating device, the electrolysis device comprises a power supply, an anode connected with a positive electrode of the power supply, a cathode connected with a negative electrode of the power supply and an electrolytic tank, and the electrolytic tank contains electrolyte. The electrolyte circulating device comprises a circulating pump, a liquid inlet end and a liquid outlet end, the liquid inlet end and the liquid outlet end are connected with two ends of the circulating pump, the liquid inlet end is inserted below the electrolyte, and the liquid outlet end is connected with the spray head and is arranged opposite to the cathode of the electrolysis device. According to the device, external hydrodynamic force is adopted to enable BO2 <-> and BH4 <-> ions to be quickly sprayed out of the anode and sprayed on the surface of the cathode, so that electromigration of BO2 <-> and BH4 <-> anions to the anode can be effectively avoided, mass transfer of BO2 <-> to the surface of the cathode is effectively improved, the electrochemical reduction rate of BO2 <-> at the cathode is increased, and the preparation efficiency of sodium borohydride is improved. The device is simple in structure and low in cost.

Description

technical field [0001] The invention belongs to the field of hydrogen storage material production, and in particular relates to a hydrogen storage device for preparing sodium borohydride by reducing sodium metaborate based on a spray electrochemical device. Background technique [0002] The construction of a renewable energy hydrogen production system is a prerequisite for the realization of a green hydrogen energy supply system. At present, 96% of hydrogen production in my country mainly comes from fossil fuel hydrogen production and chemical by-product hydrogen. Sodium borohydride is an excellent hydrogen storage material, its hydrogen storage density can reach 10.8wt%, the regeneration product is pollution-free, and the hydrogen desorption purity is high. Currently used electrochemical reduction of NaBO 2 Preparation of NaBH 4 The specific reaction process is shown in formula (1): [0003] NaBO 2 +2H 2 O→2O 2 +NaBH 4 (1) [0004] The main problem in the preparat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B9/17C25B1/14C25B11/02C25B15/08
CPCC25B1/14C25B11/02C25B15/08
Inventor 魏永生司司付文英刘妍陈佳琪韦露赵新生
Owner XUZHOU NORMAL UNIVERSITY