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Single-cell activation method for direct borohydride fuel cell

A borohydride and fuel cell technology, used in fuel cells, fuel cell additives, fuel cell control, etc., can solve the problems of high fuel consumption, low fuel utilization, low battery performance, etc., to achieve a simple system and eliminate dependence. , the effect of simplifying the system

Active Publication Date: 2014-06-04
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, the main problems restricting the development of DBFC include: high cost of borohydride as fuel, insufficient activity of anode catalyst, low fuel utilization rate due to hydrogen evolution caused by anode side reaction, long battery activation time, high fuel consumption, low battery performance, etc.
The longer the activation time, the more borohydride and oxidant used as fuel, the higher the activation cost of the battery, and the longer the period of catalyst screening by battery

Method used

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  • Single-cell activation method for direct borohydride fuel cell
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Set the effective area to 5cm 2 The DBFC uses a single-piece membrane electrode and the corresponding flow field plate, collector plate, and end plate to assemble a DBFC single cell. The assembly torque of the battery is 2.5Nm. Activate the single cell as follows:

[0056] The first part of the battery setting: (1) Use circulating water to control the battery temperature to 50±1°C; (2) Supply the normal temperature sodium borohydride aqueous solution stabilized by 2M NaOH to the battery anode, NaBH 4 The concentration is 1M, the flow rate is 1ml min -1 ;Introduce ordinary O to the battery cathode 2 , the inlet pressure control is 0.025±0.002MPa, the battery outlet O 2 Flow rate control is 17.5±0.5ml min -1 . The reactants are not recycled;

[0057] The second part of battery activation: (1) Connect the positive and negative terminals of the battery to the corresponding terminals of the electronic load; (2) Connect the terminals of the AC signal generator to the b...

Embodiment 2

[0062] Set the effective area to 5cm 2 The DBFC uses a single-piece membrane electrode and the corresponding flow field plate, collector plate, and end plate to assemble a DBFC single cell. The assembly torque of the battery is 2.5Nm. The single cell is activated according to the activation mode provided by the present invention.

[0063] The first part of the battery setting: (1) Use circulating water to control the battery temperature to 30±1°C; (2) Supply a normal temperature potassium borohydride aqueous solution stabilized by 0.5M NaOH to the battery anode, KBH 4 The concentration is 3M, the flow rate is 5ml min -1 ; Pass 3M H to the battery cathode 2 SO 4 Stable aqueous hydrogen peroxide, H 2 o 2 The concentration is 2M, the flow rate is 5ml min -1 . The reactants are not recycled.

[0064] The second part of battery activation: (1) Connect the positive and negative terminals of the battery to the corresponding terminals of the electronic load; (2) Connect the t...

Embodiment 3

[0069] Set the effective area to 5cm 2 The DBFC uses a single-piece membrane electrode and the corresponding flow field plate, collector plate, and end plate to assemble a DBFC single cell. The assembly torque of the battery is 2.5Nm. The single cell is activated according to the activation mode provided by the present invention.

[0070] The first part of the battery setting: (1) Use circulating water to control the battery temperature at 80±1°C; (2) Supply a normal temperature potassium borohydride aqueous solution stabilized by 5M NaOH to the battery anode, NaBH 4 The concentration is 0.5M, the flow rate is 3ml min -1 ;Introduce ordinary O to the battery cathode 2 , the inlet pressure control is 0.005±0.002MPa, the battery outlet O 2 Flow rate control is 17.5±0.5ml min -1 .

[0071]The second part of battery activation: (1) Connect the positive and negative terminals of the battery to the corresponding terminals of the electronic load; (2) Connect the terminals of the...

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Abstract

The present invention provides a single-cell activation method for a direct borohydride fuel cell (DBFC). The single-cell activation method is characterized by comprising three steps such as initial stage activation, electrochemical alternating current accelerated activation and cell performance testing, has characteristics of rapid electrochemical reaction interface expansion, short activation time, fuel saving, simple system and the like, and is especially suitable for activation of the DBFC with characteristics of low catalyst activity and long activation time.

Description

technical field [0001] The invention relates to an activation method of a single cell of a direct borohydride fuel cell. Background technique [0002] Direct Borohydride Fuel Cell (DBFC) is a kind of using alkali metal borohydride MBH 4 (M=K, Na, Li) as a fuel generating device. Borohydride is used as fuel and oxygen (or hydrogen peroxide) is used as oxidant. Because DBFC has the advantages of high open circuit voltage and high theoretical energy density of this type of battery, it has received extensive attention in recent years, and related technologies have also developed rapidly. [0003] When the direct borohydride fuel cell works, the fuel sodium borohydride (dissolved in sodium hydroxide solution) and the oxidant oxygen reach the anode and cathode of the battery through the channels on the end plate respectively, and the reactants pass through the diffusion layer on the electrode to reach the electrode catalyst In the active center of the layer, borohydride reacts ...

Claims

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Application Information

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IPC IPC(8): H01M8/08H01M8/04H01M8/00H01M8/04298
CPCY02E60/50H01M8/04223H01M8/083
Inventor 张华民邱艳玲曲超张凤祥
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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