Analysis probes charge transfer in porous battery electrodes for the first time
The electrochemical reactions inside the porous electrodes of batteries and fuel cells have been described by theorists, but never measured directly. Now, a team at MIT has figured out a way to measure the fundamental charge transfer rate—finding some significant surprises.
The study found that the Butler-Volmer (BV) equation, usually used to describe reaction rates in electrodes, is inaccurate, especially at higher voltage levels. Instead, a different approach, called Marcus-Hush-Chidsey charge-transfer theory, provides more realistic results—revealing that the limiting step of these reactions is not what had been thought.
Read more at: http://phys.org/news/2014-04-analysis-probes-porous-battery-electrodes.html#jCp
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