講演情報
[14p-P07-39]Electrochemical Nitrate Reduction to Ammonia Using Homogeneous Multielement Alloy Catalyst
〇(M2)YuanChun Ye1, Jenn Fang Su1,2 (1.Department of Chemical and Materials Engineering, Chang Gung Univ., 2.Center for Sustainability and Energy Technologies, Chang Gung Univ.)
キーワード：
multielement alloy catalyst、electrocatalysis、nitrate reduction
Ammonia serves as a vital feedstock for the production of nitrogen-based fertilizers, chemicals, pharmaceuticals, and polymers. Additionally, it holds potential as a hydrogen carrier, capable of being decomposed to provide hydrogen on demand. In recent years, significant efforts have been made to explore innovative alternatives to the energy- and resource-intensive Haber-Bosch process. Among these, electrochemical nitrate reduction reactions (NO3RR) have garnered attention for their dual benefits of effectively removing nitrates and generating ammonia under ambient conditions. In this study, we present a multielement alloy catalyst featuring dispersed copper (Cu) alongside synergistic components such as nickel (Ni), platinum (Pt), and ruthenium (Ru). The catalyst is synthesized using a high-temperature rapid annealing process designed to address the thermodynamic immiscibility between these metals. The successful preparation of homogeneous catalysts was confirmed by a series of characterization techniques, including scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD). The electrochemical analysis demonstrated that the Cu-Ni-Pt-Ru catalyst exhibited superior nitrate reduction activity among other synthesized samples. Under a reduction potential of -0.85 V, the Cu-Ni-Pt-Ru catalyst achieved a highest ammonium yield of 51.41%, outperforming Cu-Ni (46.69%), Cu-Ni-Pt (36.91%), and Cu-Ni-Ru (15.69%) catalysts. This study highlights the synergistic interactions among multiple metals, resulting in enhanced catalytic performance.