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Grow Bimetallic Platinum‐Iridium Alloy on Reduced Graphene Oxide to Construct Hetero‐Atomic Bridge Catalysis toward Efficient Electrooxidation of Methanol
Author(s) -
Zhou Ling,
Zhao Zhi Liang,
Zhang Lian Ying,
An Hong Ming,
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.201701379
Subject(s) - bimetallic strip , catalysis , materials science , methanol , graphene , platinum , oxide , iridium , alloy , inorganic chemistry , chemical engineering , nanotechnology , chemistry , composite material , metallurgy , organic chemistry , engineering
Abstract Bimetallic platinum‐iridium (PtIr) alloy on carbon has been reported to reduce Pt loading toward electrooxidation of ammonia. Herein ultra‐small bimetallic platinum‐iridium (PtIr) alloy nanocrystals are directly and uniformly grown on reduced graphene oxide (rGO) by a one‐pot solvothermal approach, and further used as a catalyst toward electrooxidation of methanol for the first time. The optimal Pt in PtIr/rGO can be as low as 80% while delivering extraordinarily higher catalytic current density than Pt/rGO and commercial Pt/C catalysts by 1.5 times and 2.6 times, respectively, and much better durability. Differently from the ammonia oxidation on PtIr/C, the remarkable improved electrocatalytic performance of Pt 4 Ir 1 /rGO with a much lower loading of Pt is mainly attributed to heteroatomically bridged catalysis of the Ir−Pt alloy, in which ‐OH easily forms on Ir surface via the atomic bridge to oxidize CO absorbed on Pt surface for greatly boosting the catalytic performance of methanol oxidation. The highly conductive graphene support also has positive impact on the excellent catalytic performance. This work provides a facile approach to fabricate low‐loaded Pt but highly active anode catalyst for direct methanol fuel cells, and the hetero‐atomic bridged catalytic process in an electrode kinetics may make a universal significance.