“…UAAP have properties that are of interest in catalysis: (i) the presence of a large number of surface coordinatively unsaturated sites, (ii) the lack of crystal defects, and (iii) the isotropic, single phase nature of the materials. Examples of UAAP include M-B (M = Fe, Co or Ni) [46][47][48][49][50][51][52][53], Ni-P [54][55][56][57][58][59], Co-P [60], Fe-P-B (M = Cr, Co or Ni) [61,62], Ni-P-B [61,[63][64][65], Fe-Co-B [66], Fe-Ni-B [66,67], Ni-Co-B [68] as well as ultrafine crystalline particles of Co, Co 2 B or Co(BO 2 ) 2 , and Fe, Fe 2 B, Mg, Al, Ni, Pd [69], and Cu.…”