Herein, the utilization of poly(N-vinyl-2-pyrrolidone)-protected ruthenium-rhodium nanoparticles (3.4 +/- 1.4 nm) as highly efficient catalysts in the hydrolysis of ammonia borane for hydrogen generation is reported. They are prepared by co-reduction of ruthenium and rhodium metal ions in ethanol/water mixture by an alcohol reduction method and characterized by transmission electron microscopy-energy dispersive X-ray spectroscopy, ultraviolet-visible spectroscopy, and X-ray photoelectron spectroscopy. They are durable and highly efficient catalysts for hydrogen generation from the hydrolysis of ammonia borane even at very low concentrations and temperature, providing average turnover frequency of 386 mol H-2 (mol cat)(-1) min(-1) and maximum hydrogen generation rate of 10,680 L H-2 min(-1) (mol cat)(-1). Poly(N-vinyl-2-pyrrolidone)-protected ruthenium-rhodium nanoparticles also provide activation energy of 47.4 +/- 2.1 kJ/mol for the hydrolysis of ammonia borane. (C) 2015 Elsevier B.V. All rights reserved.