Weifeng Chen, Jialu Shen, Yingping Huang
Apr 28, 2020
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Influential Citations
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Journal
ACS Sustainable Chemistry & Engineering
Abstract
The search of new H₂ evolution systems avoiding fossil sources and their mechanisms is a priority in the 21st century society. Hydrolysis of tetrahydroxydiboron (TDB), a current borylation source in the literature, is used here for H₂ evolution for the first time. It is catalyzed by graphene quantum dot-stabilized nanoparticles (NPs). With RhNP- or PtNP-catalyzed reactions, D₂ formation from D₂O confirms that water is the only hydrogen source. Kinetic isotopic effects yield kH/kD = 5.91 and 4.18, strongly suggesting double water O–H bond cleavage on the NP surface in the rate-limiting step. The most efficient catalysts are the RhNP and PtNP (total turnover frequencies: 3658 and 4603 molH₂·molcₐₜ–¹·min–¹, respectively). The order of catalytic activity is as follows: PtNP > RhNP > AuNP > PdNP > IrNP > RuNP, and a catalytic mechanism of TDB hydrolysis is proposed.