Register to reply

Determining efficiency of fuel cells

by boddhisattva
Tags: cells, determining, efficiency, fuel
Share this thread:
Dec19-12, 04:28 PM
P: 7

I need to compare solid working with
\frac{1}{2}O_{2}+H_{2}O+2e^{-} \rightarrow 2OH^{-}


[itex]H_{2}+2OH^{-} \rightarrow 2H_{2}O+2e^{-}[/itex]

and liquid fuel cells working with

H_{2}\rightarrow 2H^{+}+2e^{-}
\frac{1}{2}O_{2}+2H^{+}+2e^{-} \rightarrow H_{2}O

My idea was to compare the required electrical energy (which I know by [itex] dt U I [/itex] and the chemical energy given by [itex] Q \cdot n_{H_{2}O}=Q\cdot n_{H_{2}O}=Q\cdot\nu_{gas}\cdot n_{O_{2}}=Q\cdot\nu_{O_{2}}\cdot\frac{PV_{O_{2}}}{n_{O_{2}}RT}

where [itex] \nu _{O_{2}} [itex] is a coefficient that is equal to 1/2 in the case of solid fluel cells. My question is simple: what is [itex] \nu _{O_{2}} [itex] equal to in the case of liquid cell since there is a double equation and that we don't know which portion of OH^{-} of the reductive equation is used in the oxydative equation.

Any help would be helpful, thanks
Phys.Org News Partner Chemistry news on
Chinese scientists use laser-induced breakdown spectroscopy to identify toxic cooking 'gutter oil'
New insights into 'switchable water' have implications for water purification and desalination
A glucose meter of a different color provides continuous monitoring

Register to reply

Related Discussions
Is the Carnot efficiency valid for fuel cells? Classical Physics 2
Determining Fuel Efficiency Classical Physics 5
Fuel cells Chemistry 4
Determining the Efficiency of a Fuel Introductory Physics Homework 3
Fuel cells General Engineering 14