Γ-Alumina Supported Copper Oxide Nanostructures Promoted with Ruthenium Oxide (RuO2-CuO/Al2O3) and Palladium Oxide (PdO-CuO/Al2O3): Efficient Electrodes for Heterogeneous Catalysis of Ammonia Electrooxidation. Issue 7 (1st July 2022)

• Record Type: Journal Article
• Authors: Khan, Safia; Shah, Syed Sakhawat; Ahmad, Awais; Bayrakçeken Yurtcan, Ayse; Katubi, Khadijah Mohammedsaleh; Janjua, Naveed Kausar
• Is Part Of: Journal of the Electrochemical Society. Volume 169:Issue 7(2022)
• Publication Date: 2022-07-01
• Subjects: Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/1945-7111/ac81fb
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : RuO2 and PdO promoted CuO/Al2 O3 mixed metal oxide nanostructures synthesized via co-impregnation technique demonstrated a robust electrocatalytic activity towards ammonia electro-oxidation (AEO). Physio-chemically characterized RuO2 -CuO/Al2 O3 and PdO-CuO/Al2 O3 catalyst powders exhibited high electrochemical active surface area (ECSA), highest being shown by 1% RuO2 -CuO/Al2 O3 . All fabricated electrodes displayed pleasing electroactive response towards AEO but ternary metal oxides showed superior and promoted catalytic output owing to their larger ECSA, higher current densities ( j ), larger diffusion coefficients (D°), greater apparent rate constants (kapp ), and lower charge transfer resistance (Rct ) values. Lower values of Rct obtained from EIS indicated the facilitation of electro-oxidation process over modified electrodes. The finest catalysis performance is expressed by 1% RuO2 -CuO/Al2 O3 producing the maximum oxidation current. All the promoted CuO/Al2 O3 mixed metal oxide exhibited excellent stability and reproducibility in analyte solution. Consequently, γ -Al2 O3 supported metal oxide electrocatalysts can be of great socio-economic significance by enhancing the energy production kinetics thereby achieving a higher energy output.