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the turnover frequency (TOF) was calculated according to equation: TOF = j*A/(4*F*m), where j is the current density  obtained at overpotential of 400mV in A cm-2
, A is the surface area of the electrode,  F is the Faraday efficiency (96,485 Cmol-1) and m is the number of moles of the Ni2+ deposited onto the electrodes.

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