JPS58131666A - Fused salt type fuel cell - Google Patents

Abstract

PURPOSE:To obtain a fuel cell where high performance can be maintained for long term, by previously holding more electrolyte than that required for reacting with an electrode material in a thin hole of an anode and/or cathode thereby preventing the flow-out and movement of the electrolyte from an electrolytic member to the electrode. CONSTITUTION:More electrolyte than that required for reacting with an electrode material is held in thin hole of an anode and/or cathode. When all holes are filled with the electrolyte, the dispersion of the reaction gas is slowed considerably thereby the three-phase interface is not formed easily to deteriorate the electrochemical reaction. In order to promote the electrochemical reaction, the holding amount is preferable to be more than that required for the electrode material while less than 50vol.% of the electrode thin hole volume. When it will exceed over 50vol.%, the gas diffusion is deteriorated to deteriorate the cell performance.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bath-salt fuel cell, and particularly to an electrode suitable for maintaining stable cell performance over a period of time.

A 118 salt fuel cell is composed of an electrolyte body disposed between an anode and a cathode, and a separator provided with a gas chamber for supplying a reactive gas to the anode and cathode. The electrolyte body consists of an alkali carbonate@solite and a matrix material that holds it, and at around 650C during battery operation, the electrolyte melts into a female shape and is held in the matrix material. however,#! The electrolyte absorbed by the anode and cathode that are in close contact with the electrolyte body may react with the electrolyte depending on the electrode material, reducing the electrolyte mass of the electrolyte body and seriously damaging ionic conductivity. Battery performance deteriorates. On the other hand, small pores are generated in the electrolyte body when the electrolyte is in a state of insufficient electrolyte, and the anode gas flows out to the cathode side. As a result, battery operation becomes impossible.

The object of the present invention is to provide a fuel cell which compensates for the disadvantages of the above-mentioned conventional techniques and maintains high performance over a long period of time.

Original @OR1! In this case, by retaining more electrolyte in the anode and/or cathode pores than will react with its electrode material, the flow of electrolyte from the electrolyte body to the electrode is reduced. The purpose is to prevent

By the way, in the f# molten salt fuel cell a, an electrochemical reaction proceeds at the phase interface where the electrode, electrolyte, and reactant gas contact each other.

To hold wLyf6'j in the electrode pore,
If the electrolyte fills all of the electrode pores, the diffusion of the reactant gas will be unbelievably slow, and a three-phase interface will be formed.
Gas chemical reactions are impaired. Therefore, in order to effectively proceed with the electrochemical reaction, the retained amount must be greater than the amount that reacts with the electrode material, and the amount so
It is preferable that it is less than VAT%.aso vot
% or more, gas diffusion becomes poor and the water resistance decreases.

Hereinafter, the present invention will be discussed in detail in detail.

Example 1 Smooth lithiated porous sintered nickel electrode (
100X100■, thickness 1.5■, porosity 59%) and alkaline carbonate! Sprinkle 4.42 g of IL solute (layered potassium carbonate = 62:38 molar ratio) and heat in an electric furnace at 530C for 1 hour in a hot atmosphere.
Electrolyte was impregnated into the electrode pores. The amount of electrolyte supported was approximately 25,100% per hole in the electrode. ζ0(41it-
A cell was constructed using the anode and cathode, and the cell performance was measured at 6500 using a mixed gas consisting of 50% hydrogen-TERA for the anode 111 and 125% oxygen-25% carbon dioxide-nitrogen for the cathode 111T as the reactive gas. zoV
When rice was fed and the current density was 100mA15I'', the initial rudder was α72V, 0.77V after 100 hours, and α75V after 200 hours.

Comparative example 1 Porous nickel 11ft body electric 1j (100X100m.

Thickness 1. ! s ■, porosity 59%) was used for the anode and cathode to form a single cell.The battery performance was 11!11it with the same porosity. Current density 100mA/crn
”, the initial battery performance showed α78V, but after 50 hours, it decreased to o, azvt. At this time, when the log gas emitted from the cando side was analyzed by gas chromatography, hydrogen was detected at α38 VOt%, and the anode gas was the cathode gas. It has been reported that Confucianism was a cross-over.

Claims (1)

[Claims] 1. The electrolyte body, fuel, and oxidizer disposed between the anode and cathode and both electrodes are supplied to the fuel chamber disposed on the anode side and the oxidizer chamber disposed on the cathode side, respectively. 1. A fuel cell that generates electricity electrochemically, characterized in that more electrolyte is retained in the pores of the anode and/or cathode than reacts with the electrode material thereof.