To store energy, the fuel cell could be coupled to an external
charge storing device such as a battery but this increases the
total weight and volume of the system. Storing charge in the
fuel cell materials would therefore be a great advantage. To
implement this strategy, fuel cell materials that reversibly
transfer charges such as in batteries are needed. We fabricated
TF-SOFC with vanadium oxide anodes or vanadium oxide/
porous Pt bilayer anodes. Vanadium is known for its propensity
to change oxidation state, a property making vanadium oxide a
candidate electrode material for different battery technologies.
7,8 Moreover, hydrogen can be inserted in VO2 and V2O5
and nonstoichiometric V6O13 and V3O7, with H/V ratios in the
range 0.3−1.9 depending on the oxide.9−11 Our vanadium
oxide anode TF-SOFCs supply electricity 2−14 times longer
than reference porous Pt anode fuel cells when the hydrogen
fuel supply is turned off. During regular fuel cell operation at
temperatures of 300−360 °C with humidified hydrogen, the
open circuit voltages and maximum power densities of the
vanadium oxide/porous Pt bilayer anode fuel cells are similar to
that of the reference porous Pt anode fuel cells.
To store energy, the fuel cell could be coupled to an external
charge storing device such as a battery but this increases the
total weight and volume of the system. Storing charge in the
fuel cell materials would therefore be a great advantage. To
implement this strategy, fuel cell materials that reversibly
transfer charges such as in batteries are needed. We fabricated
TF-SOFC with vanadium oxide anodes or vanadium oxide/
porous Pt bilayer anodes. Vanadium is known for its propensity
to change oxidation state, a property making vanadium oxide a
candidate electrode material for different battery technologies.
7,8 Moreover, hydrogen can be inserted in VO2 and V2O5
and nonstoichiometric V6O13 and V3O7, with H/V ratios in the
range 0.3−1.9 depending on the oxide.9−11 Our vanadium
oxide anode TF-SOFCs supply electricity 2−14 times longer
than reference porous Pt anode fuel cells when the hydrogen
fuel supply is turned off. During regular fuel cell operation at
temperatures of 300−360 °C with humidified hydrogen, the
open circuit voltages and maximum power densities of the
vanadium oxide/porous Pt bilayer anode fuel cells are similar to
that of the reference porous Pt anode fuel cells.
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