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Self‐Assembling PDDA on Graphene to Surfactant‐Free Synthesize Uniform and Ultra‐Small Pd Nanocrystals by Direct CO Reduction for Efficient Catalyst Toward Formic Acid Oxidation
Author(s) -
Liu Ze,
Zhang Lian Ying,
Wang Yi,
Zhao Zhiliang,
Li Chang Ming
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201700599
Subject(s) - catalysis , nanocrystal , graphene , materials science , chemical engineering , formic acid , pulmonary surfactant , nanotechnology , electron transfer , electrocatalyst , electrochemistry , chemistry , electrode , photochemistry , organic chemistry , engineering
Herein a facile strategy to self‐assemble PDDA on graphene for surfactant‐free synthesizing uniform and ultra‐small Pd nanocrystals (Pd@PDDA−G, average size of 3.4 nm) by direct CO reduction has been accomplished. The as‐prepared Pd@PDDA−G catalyst exhibits much more negative half‐wave potential than the commercial Pd/C and Pd@G without using PDDA by 40 mV and 15 mV as well as much higher peak current density than latters by 2.5 and 2 times, respectively toward formic acid oxidation, demonstrating superior electrocatalytic activity. In addition, the catalyst presents better stability than both Pd@G and commercial Pd/C. The electrocatalytic enhancement mechanism could be attributed to produced uniformly ultra‐small and clean Pd nanocrystals on porous graphene for high reaction surface area and fast interfacial electron transfer process. This work also offers a universal route to prepare other high performance catalysts for broad applications in energy systems and sensing devices.