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The electrochemically active surface area ( ECSA )can be calculated from the charge involved in the hydrogen adsorption/desorption processes using Equation 1

ECSA = Q/0.21mCcm−2¡ÁPdm

where Q (mC) and Pd m are the charge for hydrogen adsorption/desorption and the loading of Pd on electrode respectively, while 0.21 mC cm − 2 is the electrical charge associated with monolayer adsorption of hydrogen on Pd.

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