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

Abstract

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 H2 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 PdxNi100−x/MCN nanocomposites (NCs) with different Ni/Pd ratios, the Pd74Ni26/MCN catalyst exhibits the best catalytic performance with a TOF of 246.8 mol H2 mol metal−1 min−1. The high activity of Pd/MCN and Pd74Ni26/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.

Hollow Nickel–Cobalt Layered Double Hydroxide Supported Palladium Catalysts with Superior Hydrogen Evolution Activity for Hydrolysis of Ammonia Borane

“…Moreover, on the basis of the amounts of Pd atoms, as determined by ICP‐OES, the TOF of Pd/α‐LDH was found to be 49.5 min −1 , which is considerably better than the TOF of Pd/β‐LDH (28.1 min −1 ). Table compares the activities of 0.0025 mol g −1 Pd/α‐LDH and Pd/β‐LDH with those of various related Pd catalysts documented in the literature . Among all these Pd catalysts, we conclude the Pd/α‐LDH presented in this study is a state‐of‐art Pd catalyst for the hydrolysis of AB.…”

Electrons and Hydroxyl Radicals Synergistically Boost the Catalytic Hydrogen Evolution from Ammonia Borane over Single Nickel Phosphides under Visible Light Irradiation

“…[8][9][10][11][12][13][14][15][16][17][18] However, their activities still remain low compared with the noble metal catalysts. [19][20][21][22][23][24][25][26][27] Thus, it is highly desirable to explore new catalytic systems using low-cost and efficient catalysts for hydrogen evolution.…”

Carbon nitride supported Ni0.5Co0.5O nanoparticles with strong interfacial interaction to enhance the hydrolysis of ammonia borane

“…19 Currently, carbon nitride (C 3 N 4 ) is widely studied as an excellent supporting material for various energy related applications. [23][24][25] Carbon nitride was also used to support NPs for the hydrolysis of AB. [25][26][27][28] For example, Au-Co NPs on carbon nitride were reported to remarkably enhance the catalytic hydrolysis of AB with a favorable Motty-Schottky effect at the metal-semiconductor interface.…”