Iced photochemical reduction to synthesize atomically dispersed metals by suppressing nanocrystal growth

Hehe Wei, Kai Huang, Da Wang, Ruoyu Zhang, Binghui Ge (), Jingyuan Ma, Bo Wen, Shuai Zhang, Qunyang Li, Ming Lei, Cheng Zhang, Joshua Irawan, Li-Min Liu () and Hui Wu ()
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Hehe Wei: Tsinghua University
Kai Huang: Tsinghua University
Da Wang: Beijing Computational Science Research Center
Ruoyu Zhang: Tsinghua University
Binghui Ge: Institute of Physics, Chinese Academy of Sciences
Jingyuan Ma: Shanghai Institute of Applied Physics, Chinese Academy of Sciences
Bo Wen: Beijing Computational Science Research Center
Shuai Zhang: State Key Laboratory of Tribology, Tsinghua University
Qunyang Li: State Key Laboratory of Tribology, Tsinghua University
Ming Lei: Beijing University of Posts and Telecommunications
Cheng Zhang: Shanghai Institute of Technology
Joshua Irawan: University of New South Wales
Li-Min Liu: Beijing Computational Science Research Center
Hui Wu: Tsinghua University

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: Abstract Photochemical solution-phase reactions have been widely applied for the syntheses of nanocrystals. In particular, tuning of the nucleation and growth of solids has been a major area of focus. Here we demonstrate a facile approach to generate atomically dispersed platinum via photochemical reduction of frozen chloroplatinic acid solution using ultraviolet light. Using this iced-photochemical reduction, the aggregation of atoms is prevented, and single atoms are successfully stabilized. The platinum atoms are deposited on various substrates, including mesoporous carbon, graphene, carbon nanotubes, titanium dioxide nanoparticles, and zinc oxide nanowires. The atomically dispersed platinum on mesoporous carbon exhibits efficient catalytic activity for the electrochemical hydrogen evolution reaction, with an overpotential of only 65 mV at a current density of 100 mA cm−2 and long-time durability (>10 h), superior to state-of-the-art platinum/carbon. This iced-photochemical reduction may be extended to other single atoms, for example gold and silver, as demonstrated in this study.

Date: 2017
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DOI: 10.1038/s41467-017-01521-4

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