The necessity for alternative energy solutions is motivated from increasing fuel prices, stringent emission regulations, and depleting fuel resources.  The most attractive option is H₂, as it has high-energy efficiency and H₂O is the only byproduct of its combustion.   Ammonia has emerged as an attractive source for H₂ because of its high hydrogen storage capacity (17.7 %), energy density (3000 Wh/kg), and the catalytic decomposition of NH₃ is free of CO_x emissions.  Ru catalysts have been successful for this reaction and we have chosen to examine this system further.  Using incipient wetness impregnation, we have investigated the effect of several promoters (K, Cs, Ba, Na, Rb, Li, Sr) and solvents (H₂O, DMSO, ACN, THF, MEK, 2-propanol) on the low-temperature ammonia decomposition over Ru catalysts supported on Al₂O₃. Using the high-throughput screening, we have determined that K promotion provides dramatic enhancement (up to 30%) in the conversion of NH₃ at a reduced temperature of 350°C (Figure 1).  Using TEM and SEM, it was discovered that the addition of K to Ru induces the formation of potassium ruthenium oxide “nanowhiskers” as opposed to Ru agglomerates (Figure 1) that appear to be responsible for the enhanced performance.  Furthermore, it was discovered that changing the preparation solvent from H₂O to an alcohol for an identical Ru/K ratio provides an additional boost in the NH₃ conversion (up to 30%) at even lower temperatures (T=300°C).