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Method for electrolytically preparing hydrogen from formic acid

A formic acid, hydrogen technology

Inactive Publication Date: 2012-05-16
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Due to the electrolysis of water for hydrogen production, the theoretical electrolysis voltage is 1.23V, but in the actual electrolysis hydrogen production process, due to certain losses, the electrolysis voltage is as high as 1.4-1.5V or more; and high energy consumption is the most important factor for realizing large-scale water electrolysis hydrogen production big obstacle

Method used

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  • Method for electrolytically preparing hydrogen from formic acid
  • Method for electrolytically preparing hydrogen from formic acid
  • Method for electrolytically preparing hydrogen from formic acid

Examples

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Embodiment 1

[0028] according to figure 1 Assemble a polymer electrolyte membrane electrolyzer, the cathode and anode diffusion layers are made of carbon paper (Toray-060) with PTFE hydrophobic treatment, wherein the anode PTFE mass percentage is 15%, and the cathode PTFE mass percentage is 30%. The anode catalyst is Pd / C, which is sprayed on the anode diffusion layer, and the loading capacity is 2mg / cm 2 ; The cathode catalyst is Pt / C, which is sprayed on the cathode diffusion layer with a loading of 1 mg / cm 2 . The electrolyte membrane is -115 membrane, electrode effective area is 4cm 2 . 2-10M formic acid solution is passed into the anode of the electrolyzer at a flow rate of 1ml / min, and nitrogen gas is passed into the cathode at a flow rate of 20 sccm. Use a PAR273A electrochemical workstation (potentiostat / galvanostat, Princeton Applied Research, USA) as a DC power supply, apply a voltage of 0.3-1V across the electrolytic cell, and control the temperature of the electrolytic ce...

Embodiment 2

[0032] Figure 4 For the use of formic acid aqueous solution as fuel, the electrolytic production of hydrogen by polymer electrolyte membrane electrolyzer is combined with proton exchange membrane fuel cell (PEMFC).

[0033] In the figure, the electrolysis power supply is a No. 5 battery (rated voltage 1.5V); the electrolyzer is two electrolysis electrodes connected in series, and constituted together with bipolar plates. Due to the existence of ohmic loss, the measured voltages of the two series electrolytic electrodes are all in the range of 0.65-0.68V.

[0034] The anode catalyst of the electrolysis electrode is Pd / C, and the loading capacity is 3mg / cm 2 , the cathode catalyst is Pt / C, and the loading capacity is 1mg / cm 2 , the total electrode area is 16cm 2 .

[0035] In the figure, the cathode and anode catalysts of the proton exchange membrane fuel cell (PEMFC) are both Pt / C, and the loading capacity is 0.4mg / cm 2 , and the cathode adopts air self-breathing mode, an...

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Abstract

The invention provides a method for electrolytically preparing hydrogen from a formic acid. The hydrogen is electrolytically prepared from a fuel which is an aqueous solution of formic acid by a polymer electrolyte film electrolyzer. An anode, an electrolyte film and a cathode are sequentially stacked and hot-pressed to form an electrolysis electrode, and the electrolysis electrode is clamped between two polar plates to form the polymer electrolyte film electrolyzer. The aqueous solution of formic acid is introduced in the anode side of the electrolyzer, a voltage is applied between the cathode and the anode so that the formic acid undergoes electro-catalytic oxidation reaction at the anode, and the hydrogen is generated on a cathode side. The method is a small-scale in-situ hydrogen preparation method which is convenient, quick and flexible, and has the advantages of low electrolysis voltage, low energy consumption, high hydrogen preparation efficiency and the like.

Description

technical field [0001] The invention relates to a hydrogen production method based on a solid polymer electrolyte membrane electrolyzer. Using formic acid aqueous solution as the anode electrolysis fuel, a certain voltage is applied on both sides of the cathode and anode, so that the formic acid undergoes an electrocatalytic oxidation reaction; the protons generated on the anode side are conducted to the cathode side through the membrane, and recombine with electrons to generate hydrogen. Background technique [0002] Hydrogen energy has the characteristics of abundant sources, cleanness and high efficiency, and it is a secondary energy source that may play a pivotal role on the world energy stage in the 21st century. The proton exchange membrane fuel cell (PEMFC) technology using hydrogen as fuel has been greatly developed in recent years. Fuel cells will likely solve the two world problems of "energy" and "environmental protection", which is of great significance to the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/06C25B1/02C25B13/08H01M8/0612H01M8/0656
CPCY02E60/50
Inventor 孙公权姜黔杨少华赵钢陈利康
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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