Hydrogen Storage and Release Properties of a Cu-Added Fe/YSZ Redox System

Table 3

Total oxidation time, quantities of evolved hydrogen, and the hydrogen evolution rate with Fe/4YSZ, Fe/8YSZ, and Fe/12YSZ during five repeated isothermal redox cycles.

	Sample	1st	2nd	3rd	4th	5th	Avg.
a	Fe/4YSZ	10.00	10.50	11.25	11.00	10.50	10.65
	Fe/8YSZ	9.75	10.50	10.50	10.75	9.75	10.25
	Fe/12YSZ	7.75	8.75	9.00	9.50	9.50	8.90
b	Fe/4YSZ	10.16	9.95	9.93	10.01	9.93	10.00
	Fe/8YSZ	9.61	9.70	9.45	9.85	9.57	9.64
	Fe/12YSZ	9.62	9.61	9.93	10.02	9.94	9.82
c	Fe/4YSZ	1.02	0.95	0.88	0.91	0.95	0.94
	Fe/8YSZ	0.99	0.92	0.90	0.92	0.98	0.94
	Fe/12YSZ	1.24	1.10	1.10	1.05	1.05	1.11

(a) Total oxidation time (min).
(b) Quantity of hydrogen evolved (mmol g⁻¹-sample).
(c) Quantity of hydrogen evolved divided by the time required for complete oxidation (mmol min⁻¹ g⁻¹-sample).