Cu-electrodeposited gold electrode for the sensitive electrokinetic investigations of nitrate reduction and detection of the nitrate ion in acidic medium
Abrar Yasir Abir, Sarir Uddin, Mahmudul Hasan, Md. Abdul Aziz, Syed Shaheen Shah, Jahir Ahmed, Mohammad A. Hasnat
Abstract
The electro-catalytic reduction of nitrate ion in acidic media was observed at the Cu-electrodeposited Au surface. The voltammetric analysis represented that the Cu/Au electrode has an enhanced catalytic activity towards nitrate reduction in acidic medium through by eight electrons transfer process. Ammonia (NH3) was produced from the reduction of nitrate (NO3–) which followed a concerted reaction pathway as the value of transfer coefficient was 0.45 at Cu/Au electrode in the acidic medium. The value of standard rate constant and open circuit potential was evaluated as 2.48 × 10−4 cms−1 and 0.10 V respectively. This Cu/Au electrode displayed a good sensitivity (5.9378 μAµM−1cm−2) and lower detection limit (LOD: 0.52 µM) towards the reduction of nitrate ion and exhibited excellent performance in real sample analysis.