Appl. surf. sci. Appl. surf. sci. Robust Ru single-atom alloy catalysts coupled with adjacent Fe-site for highly stable ammonia synthesis under mild conditions Singh Swati Komarala Eswaravara Prasadarao Kim Seok-Jin Yavuz Cafer T. Maghrabi Louai Mahdi Singh Nirpendra Harfouche Messaoud Sebastian Victor Universidad de Zaragoza Malina Ondrej Bakandritsos Aristides Anjum Dalaver Hussain AlHammadi Ali Abdulkareem Polychronopoulou Kyriaki 2024 research-article