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In a flow battery the energy is stored in

  • A.a pressurised gas above the electrolyte
  • B.electrolyte held in external tanks
  • C.the electrode plates within the stack
  • D.a separator membrane between the half cells

Answer: B

Correct answer: electrolyte held in external tanks

In a flow battery the active species are dissolved in liquid electrolytes stored in separate tanks and pumped through a stack where the reactions occur. The consequence is that energy and power are decoupled: the tanks determine how much is stored, the stack how fast it can be delivered, and each can be sized independently. That is the flow battery’s distinctive advantage over a conventional cell, where the same electrodes do both jobs.

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