Mesoporous Carbon Nitride Supported Pd and Pd-Ni Nanoparticles as Highly Efficient Catalyst for Catalytic Hydrolysis of NH3BH3

Graphical Dispersed Nanoparticles : Highly dispersed PdNi nanoparticles (NPs) have been successfully immobilized on mesoporous carbon nitride (MCN) through a facile co-reduction approach, which shows excellent catalytic performance for hydrogen release from an ammonia borane (AB) aqueous solution at room temperature. Highly dispersed Pd and PdNi nanoparticles (NPs) have been successfully immobilized on mesoporous carbon nitride (MCN) through a facile co-reduction approach. The resulting Pd/MCN catalyst shows excellent catalytic performance for hydrogen release from an ammonia borane (AB) aqueous solution with a turnover frequency (TOF) value of 125 mol H 2 mol metal −1 min −1 at room temperature, which is among the highest values for monometallic Pd-based catalysts reported to date. The catalytic performance of the Pd NPs can be further enhanced by alloying with Ni or Co atoms. Among all the synthesized Pd x Ni 100− x /MCN nanocomposites (NCs) with different Ni/Pd ratios, the Pd 74 Ni 26 /MCN catalyst exhibits the best catalytic performance with a TOF of 246.8 mol H 2 mol metal −1 min −1 . The high activity of Pd/MCN and Pd 74 Ni 26 /MCN are largely dependent on the features of the ultrafine metallic NPs immobilized by MCN, the interfacial interaction between the MCN matrix and metallic NPs, and the accessible open porous structure for mass transfer.