摘要:
To provide an operation method of a fuel cell system which even when the fuel cell repeats stop and start, can avoid degradation of the fuel cell and a fuel cell system for carrying out the method. An operation method of a fuel cell system which is provided with a fuel cell having at least one cell provided with an electrolyte, an anode and a cathode each having a platinum based metallic catalyst, the electrolyte being put between the anode and the cathode, and a pair of separator plates having formed thereon gas passages for feeding a fuel gas into the anode and feeding an oxidizing agent gas into the cathode, respectively and which switches connection and disconnection between the fuel cell and a load, wherein feeding of the oxidizing agent gas into the cathode and feeding of the fuel gas into the anode are continued until a prescribed period of time elapses after disconnection between the fuel cell and the load, and thereafter, feeding of each of the oxidizing agent gas and the fuel gas is stopped, thereby controlling the operation such that the time when the cell of the fuel cell has a voltage of 0.9 V or more falls within 10 minutes.
摘要:
The present invention provides a hydrogen storage alloy electrode high in capacity and exceptional in cycle life characteristic by improving a conventional V-based hydrogen storage alloy of a body-centered cubic structure. The electrode comprises particles of a hydrogen storage alloy represented by the general formula V 1-a-b-c-d Ti a Cr b M c L d , wherein M is at least one element selected from the group consisting of Mn, Fe, Co, Cu, Nb, Zn, Zr, Mo, Ag, Hf, Ta, W, Al, Si, C, N, P and B, and L is at least one element selected from the group consisting of Y and rare earth elements, and 0.2≤a≤0.5, 0.1≤b≤0.4, 0≤c≤0.2 and 0
摘要:
In a method for producing a multi-component hydrogen storage alloy including metals of zirconium or vanadium, oxides of these metals is used to produce an alloy having characteristics equivalent to that produced with pure metals. It comprises steps of calcining the raw material, wherein at least one selected from the group consisting of zirconium and vanadium is included in its oxide form, at a temperature ranging from 900°C to 1300°C, mixing metal calcium with said calcined raw material, and treating the mixture with heat at a temperature ranging from the melting point of metal calcium to 1300°C, under inert gas atmosphere.
摘要:
A hydrogen storage alloy preferably used for electrodes in an alkaline storage battery is provided. The alloy is of the general formula ZrMn w V x Mo b M y Ni z , wherein M is at least one element selected from the group consisting of Fe and Co and 0.4 ≦ w ≦ 0.8, 0 ≦ x ≦ 0.3, 0.05 ≦ b ≦ 0.2, 0 ≦ y ≦ 0.2, 1.0 ≦ z ≦ 1.5, and 2.0 ≦ w + x + b + y + z ≦ 2.4 . The alloy has C15-type Laves phases of a crystal structure similar to that of MgCu₂ as a main alloy phase, and a lattice constant "a" such that 7.05 Å ≦ a ≦ 7.13 Å,
摘要:
In a method for producing a multi-component hydrogen storage alloy including metals of zirconium or vanadium, oxides of these metals is used to produce an alloy having characteristics equivalent to that produced with pure metals. It comprises steps of calcining the raw material, wherein at least one selected from the group consisting of zirconium and vanadium is included in its oxide form, at a temperature ranging from 900°C to 1300°C, mixing metal calcium with said calcined raw material, and treating the mixture with heat at a temperature ranging from the melting point of metal calcium to 1300°C, under inert gas atmosphere.