Hydrolysis of NH3BH3 and NaBH4 by graphene quantum dots-transition metal nanoparticles for highly effective hydrogen evolution.

Recently, effective hydrogen (H 2) evolution upon hydrolysis of different hydrogen storage materials has received much attention. Herein, graphene quantum dots-transition metal nanoparticles (GQDs-TMNPs), with high dispersibility and activity, have been successfully applied in the hydrolysis of both NH 3 BH 3 (AB) and NaBH 4 for the first time. GQDs-RhNPs, GQDs-RuNPs, and GQDs-PtNPs are very effective in the hydrolysis of AB and the turnover frequencies (TOFs) can achieve to as high as 656, 384, and 281 mol H2 ·mol cat −1 min−1, respectively. Moreover, the synergistic effect between GQDs and TMNPs is explored, and the mechanisms of catalytic hydrolysis of AB and NaBH 4 by GQDs-TMNPs are proposed. This work not only paves the way for the development of GQDs-TMNPs nanocatalysts for the different hydrogen storage materials, but also further advances the understanding of the synergistic effects between GQDs and TMNPs. Image 1 • GQDs-TMNPs have been firstly applied in the hydrolysis of both AB and NaBH 4. • RhNPs, PtNPs and RuNPs are very efficient for H 2 evolution upon hydrolysis of AB and NaBH 4. • GQDs-TMNPs have been successfully recycled 5 times without significant decrease. [ABSTRACT FROM AUTHOR]