Boosting the electrocatalytic ammonia oxidation reaction through dual-interface effects

Abstract

Interface engineering of metal oxide/alloy/carbon composites could enhance NH₃ dehydrogenation while weakening *N binding on Pt. In this work, we synthesized PtCoO_x/C catalysts via a facile method, leveraging the synergistic effects of dual-interfaces – specifically, the “metal oxide-alloy” (PtCo–CoO_x) and “alloy-carbon” (PtCo–C) interfaces. Both PtCo–CoO_x and PtCo–C could synergistically modulate Pt's electronic structure, promoting the ammonia oxidation reaction (AOR). The electrochemical results reveal that PtCoO_x/C achieves a remarkable current density of 18.4 mA cm⁻² and exhibits superior stability compared to both PtCo/C and PtCo SS/C. The results highlight the critical role of dual-interface effects in enhancing the AOR.