Re-envisioning a sustainable hydrogen energy economy
Re-envisioning a sustainable hydrogen energy economy
Re-envisioning a sustainable hydrogen energy economy
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Slide 54<br />
⎪<br />
⎪<br />
⎭<br />
⎪<br />
⎪<br />
⎬<br />
⎫<br />
⎪<br />
⎪<br />
⎩<br />
⎪<br />
⎪<br />
⎨<br />
⎧<br />
⎟<br />
⎟<br />
⎠<br />
⎞<br />
⎜<br />
⎜<br />
⎝<br />
⎛<br />
⎟<br />
⎟<br />
⎠<br />
⎞<br />
⎜<br />
⎜<br />
⎝<br />
⎛<br />
α<br />
−<br />
− η<br />
+<br />
⎟<br />
⎟<br />
⎠<br />
⎞<br />
⎜<br />
⎜<br />
⎝<br />
⎛<br />
⎟<br />
⎟<br />
⎠<br />
⎞<br />
⎜<br />
⎜<br />
⎝<br />
⎛<br />
α<br />
η<br />
+<br />
⎪⎭<br />
⎪<br />
⎬<br />
⎫<br />
⎪⎩<br />
⎪<br />
⎨<br />
⎧<br />
⎟<br />
⎟<br />
⎠<br />
⎞<br />
⎜<br />
⎜<br />
⎝<br />
⎛<br />
α<br />
−<br />
− η<br />
−<br />
⎟<br />
⎟<br />
⎠<br />
⎞<br />
⎜<br />
⎜<br />
⎝<br />
⎛<br />
α<br />
η<br />
=<br />
O<br />
O<br />
FC<br />
sat<br />
O<br />
O<br />
O<br />
O<br />
E<br />
sat<br />
O<br />
O<br />
O<br />
O<br />
O<br />
O<br />
O<br />
O<br />
O<br />
cell<br />
j<br />
j<br />
RT<br />
)2F<br />
(1<br />
exp<br />
j<br />
j<br />
RT<br />
2F<br />
exp<br />
1<br />
RT<br />
)2F<br />
(1<br />
exp<br />
RT<br />
2F<br />
exp<br />
j<br />
j<br />
⎪<br />
⎪<br />
⎭<br />
⎪<br />
⎪<br />
⎬<br />
⎫<br />
⎪<br />
⎪<br />
⎩<br />
⎪<br />
⎪<br />
⎨<br />
⎧<br />
⎟<br />
⎟<br />
⎠<br />
⎞<br />
⎜<br />
⎜<br />
⎝<br />
⎛<br />
⎟<br />
⎟<br />
⎠<br />
⎞<br />
⎜<br />
⎜<br />
⎝<br />
⎛<br />
α<br />
−<br />
η<br />
+<br />
⎟<br />
⎟<br />
⎠<br />
⎞<br />
⎜<br />
⎜<br />
⎝<br />
⎛<br />
⎟<br />
⎟<br />
⎠<br />
⎞<br />
⎜<br />
⎜<br />
⎝<br />
⎛<br />
α<br />
− η<br />
+<br />
⎪⎭<br />
⎪<br />
⎬<br />
⎫<br />
⎪⎩<br />
⎪<br />
⎨<br />
⎧<br />
⎟<br />
⎟<br />
⎠<br />
⎞<br />
⎜<br />
⎜<br />
⎝<br />
⎛<br />
α<br />
−<br />
η<br />
+<br />
⎟<br />
⎟<br />
⎠<br />
⎞<br />
⎜<br />
⎜<br />
⎝<br />
⎛<br />
α<br />
− η<br />
−<br />
=<br />
H<br />
O<br />
FC<br />
sat<br />
H<br />
H<br />
H<br />
O<br />
E<br />
sat<br />
H<br />
H<br />
H<br />
H<br />
H<br />
H<br />
H<br />
O<br />
H<br />
cell<br />
j<br />
j<br />
RT<br />
)2F<br />
(1<br />
exp<br />
j<br />
j<br />
RT<br />
2F<br />
exp<br />
1<br />
RT<br />
)2F<br />
(1<br />
exp<br />
RT<br />
2F<br />
exp<br />
j<br />
j<br />
Oxygen electrode<br />
Hydrogen electrode<br />
Use same<br />
equations for both<br />
modes by<br />
changing signs of<br />
overpotentials (η O<br />
and η H ) and hence<br />
current densities<br />
between modes
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