Surface Modification of Pt(100) for Electrocatalytic Nitrate Reduction to Dinitrogen in Alkaline Solution

Abstract

Nitrate reduction on a Pt(100) electrode modified by Cu (Cu/Pt(100)) and Rh (Rh/Pt(100)) adatoms have been studied in alkaline media by means of cyclic voltammetry and in situ online electrochemical mass spectrometry (OLEMS). According to the cyclic voltammograms, nitrate reduction is catalyzed by both Cu/Pt(100) and Rh/Pt(100). Ammonia is the main product on the Rh/Pt(100) electrode in alkaline media. On Cu/Pt(100), the selective conversion from NO3(-) to N2 may be achieved. The Cu sites catalyze the reduction of NO3(-) to NO2(-), and the Pt(100) sites catalyze the reduction of NO2(-) to N2, though in different potential windows.

Cu Modified Pt Nanoflowers with Preferential (100) Surfaces for Selective Electroreduction of Nitrate

“…Remarkably, three features could indicate the presence of wellordered (100) facets in Pt NFs, which are the large reduction peaks corresponding to the nitrite conversion to ammonia at 0.2-0.5 V (R1), the broad peak for the ammonia oxidation to N2 at 0.55-0.8 V (O1), and the small reduction peak at ca. 0.56 V (R2) ascribed to the N2 evolution [8,18]. The presence of N2 evolution peak is strong evidence of the existence of broad (100) terraces in Pt NFs [21].…”

“…In alkaline media, Pd/Pt(100) [17] electrode showed higher electrocatalytic activity for nitrate reduction, but leading no N 2 as the product. In addition, compared with the Cu/Pt(100) and Rh/Pt(100) electrodes [18], the process of selectively reducing nitrate to N 2 was proved effective by decorating a fractional Cu monolayer on Pt(100) signal crystal electrode. Indeed, Cu and Rh were identified as the most active catalysts under alkaline media [19,20], which act as "promoters" for conversion nitrate to nitrite.…”

Restoring the Nitrogen Cycle by Electrochemical Reduction of Nitrate: Progress and Prospects

“…Cu adatoms can be deposited onto the substrate through direct electrodepositions. [105][106][107][108] Chen et al modified Pt (100) with Cu adatoms, with the selective conversion from NO 3 − to N 2 achieved on Cu/Pt(100). [107] This selective conversion is realized in different potential windows.…”

“…Chen et al modified Pt(100) with Rh adatoms and found that in an alkaline medium, ammonia is the main product on the Rh/Pt(100). [107] The authors claimed that intermediates were reduced on the surface of Rh rather than on Pt(100), which is due to the strong adsorption of nitrate on the Rh surface. Duca et al also confirmed this by investigating the performance of Rh-modified Pt(100) electrodes in acid medium.…”

Electrochemical method to remove nitrate in high-salt water

“…一步还原, 从而实现了在碱性溶液中将硝酸盐还原为 氮气 [54] . PtSn双金属电极对氮气也具有一定的选择性, 在PtSn电极上, 主要的气体产物是N 2 O, 它可以在Pt位 点上进一步还原为N 2 [29] .…”