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Efficient “Click”‐Dendrimer‐Supported Synergistic Bimetallic Nanocatalysis for Hydrogen Evolution by Sodium Borohydride Hydrolysis
Author(s) -
Kang Naixin,
Djeda Rodrigue,
Wang Qi,
Fu Fangyu,
Ruiz Jaime,
Pozzo JeanLuc,
Astruc Didier
Publication year - 2019
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201900246
Subject(s) - bimetallic strip , catalysis , sodium borohydride , chemistry , dendrimer , hydrolysis , borohydride , transition metal , click chemistry , inorganic chemistry , synergistic catalysis , combinatorial chemistry , organic chemistry
Hydrogen is efficiently generated upon “click” dendrimer‐supported catalysis of NaBH 4 hydrolysis by a series mono‐ and bimetallic nanoparticles (NPs) of the late transition metals. Among the monometallic NPs, PtNPs show the best performances, Co being the best first‐raw transition metal. A remarkable synergy between Pt and Co in Pt/CoNP@dendrimer is also disclosed, compared with various other bimetallic NP catalysts, achieving a TOF of 303 mol H2 ⋅ mol catal. −1 ⋅ min −1 when the ratio of Pt to Co is 1 : 1. In the presence of NaOH, the catalytic activity is boosted for all monometallic NPs except PtNPs, but NaOH exerted a negative influence on the bimetallic NP catalysts. The kinetic studies with the catalyst Pt 1 Co 1 NP@dendrimer involve in particular a primary kinetic isotope effect k D / k H =3.41 obtained for the hydrolysis reaction with D 2 O, suggesting that O−H bond cleavage of water is involved in the rate‐determining step, and an overall reaction mechanism is proposed.