On the adsorption and reduction of NO3− ions at Au and Pt electrodes studied by in situ FTIR spectroscopy

Electrochemical reduction of nitrate on Pt(S)[n(1 1 1) × (1 1 1)] electrodes in perchloric acid solution

“…This adsorbate leads to a potential-dependent infrared absorption band from 1540 cm −1 to 1580 cm −1 by in situ FTIR spectroscopy and was identified as adsorbed NO [22]. The bulk product of nitrate reduction on polycrystalline Pt electrodes at E < 0.2 V (RHE) was concluded to be NH 4 + by in situ IR spectroscopy [19], where volatile products have not been observed with DEMS for nitrate concentrations lower than 0.5 M [20,23].…”

“…0.4 V (RHE) on polycrystalline platinum electrodes [8,9,[20][21][22][23][24], concomitant with hydrogen adsorption on the surface. It is well-documented that a decrease in the extent of nitrate reduction appears in the potential region just positive to the beginning of hydrogen evolution.…”

“…Recently, the electrochemical reduction of nitrate has gained renewed interest in view of its relevance not only to the production of some valuable compounds, such as nitrous oxide for medical applications, hydroxylamine for the manufacture of caprolactam, and ammonia for fertilizers [10] but also to the removal of nitrate contamination in groundwater [10,11] and radio-active waste from nuclear industry [10,[12][13][14]. The reduction process has been studied on pure metal [1][2][3][4][5][6][7][8][9][12][13][14][15][16][17][18][19][20][21][22][23][24], alloy [19,25,26], and adatom-modified electrodes [27][28][29][30][31][32][33][34][35], involving mostly polycrystalline and platinized platinum electrodes in acidic solutions [1][2][3][4][5]…”

Electrocatalytic activity of copper alloys for $$\hbox{NO}_{3}^{-}$$ reduction in a weakly alkaline solution Part 1: Copper–zinc

“…Many papers dealing with the electrochemical reduction of NO À 3 have been published, the majority dealing with single metal electrodes [7][8][9][10]. Recently, binary metal electrodes in the form of alloys [11,12], codeposited films [13] or electrodes with foreign adatoms on their surface [14][15][16][17][18][19][20][21] have been studied.…”

The influence of nitrate concentration and acidity on the electrocatalytic reduction of nitrate on platinum

“…Among the different ways to reduce nitrate [1], a large number of papers [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] has been devoted to the electrocatalytic reduction on platinum in acidic solution.…”