Copper‐Catalyzed Electrosynthesis of Nitrite and Nitrate from Ammonia: Tuning the Selectivity via an Interplay Between Homogeneous and Heterogeneous Catalysis. Issue 21 (29th September 2021)

• Record Type: Journal Article
• Authors: Johnston, Sam; Kemp, Liam; Turay, Bila; Simonov, Alexandr N.; Suryanto, Bryan H. R.; MacFarlane, Douglas R.
• Is Part Of: ChemSusChem. Volume 14:Issue 21(2021)
• Page Start: 4793
• Page End: 4801
• Publication Date: 2021-09-29
• Subjects: ammonia -- electrocatalysis -- electrooxidation -- kinetics -- mechanism; Green chemistry -- Periodicals; Sustainable engineering -- Periodicals; Chemistry -- Periodicals; Chemical engineering -- Periodicals; 660
• DOI: 10.1002/cssc.202101557
• Languages: English
• ISSNs: 1864-5631

Abstract

Abstract: Electrocatalytic oxidation of ammonia is an appealing, low‐temperature process for the sustainable production of nitrites and nitrates that avoids the formation of pernicious N2 O and can be fully powered by renewable electricity. Currently, however, the number of known efficient catalysts for such a reaction is limited. The present work demonstrates that copper‐based electrodes exhibit high electrocatalytic activity and selectivity for the NH3 oxidation to NO2 − and NO3 − in alkaline solutions. Systematic investigation of the effects of pH and potential on the kinetics of the reaction using voltammetric analysis andin situ Raman spectroscopy suggest that ammonia electrooxidation on copper occurrs via two primary catalytic mechanisms. In the first pathway, NH3 is converted to NO2 − via a homogeneous electrocatalytic process mediated by redox transformations of aqueous [Cu(OH)4 ] −/2− species, which dissolve from the electrode. The second pathway is the heterogeneous catalytic oxidation of NH3 on the electrode surface favoring the formation of NO3 − . By virtue of its nature, the homogeneous‐mediated pathway enables higher selectivity and was less affected by electrode poisoning with the strongly adsorbed "N" intermediates that have plagued the electrocatalytic ammonia oxidation field. Thus, the selectivity of the Cu‐catalyzed NH3 oxidation towards either nitrite or nitrate can be achieved through balancing the kinetics of the two mechanisms by adjusting the pH of the electrolyte medium and potential. Abstract : Switch it up : Electrooxidation of ammonia can become a sustainable technology for the synthesis of nitrates but requires efficient, stable, and selective catalysts. The present work shows that copper can act as such catalyst and explores the underlying electrocatalytic mechanisms, the interplay of which defines the selectivity towards either nitrite or nitrate. By adjusting the reaction conditions, the reaction pathway can be switched towards the desired product.