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Novel Nanoporous Binary AuRu Electrocatalysts for Glucose Oxidation
Author(s) -
Yi Qingfeng,
Yu Wenqiang,
Niu Fengjuan
Publication year - 2010
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200900404
Subject(s) - chronoamperometry , catalysis , cyclic voltammetry , nanoporous , electrochemistry , inorganic chemistry , ruthenium , redox , materials science , chemistry , chemical engineering , nanotechnology , electrode , organic chemistry , engineering
In this work, we study the fabrication, structural characterization, and electrochemical activity of titanium‐supported binary AuRu catalysts for glucose oxidation. The catalysts including Au 99 Ru 1 , Au 95 Ru 5 , Au 93 Ru 7 and Au 88 Ru 12 were prepared by a hydrothermal method using formaldehyde as a reduction agent. The morphologies of the prepared AuRu catalyst structures are characterized by porous dendritic particles with roughened surfaces with nano‐sized flakes. Electrochemical catalytic activity of the binary AuRu catalysts towards glucose oxidation in alkaline solutions was investigated using cyclic voltammetry and chronoamperometry. All binary AuRu catalysts facilitate glucose oxidation at the lower potentials and deliver higher anodic oxidation currents compared to pure Au catalyst. Among them, the binary Au 95 Ru 5 catalyst presents the most negative onset potential of −0.872 V (vs. Ag/AgCl, 3 M KCl) for glucose oxidation in 0.1 M NaOH solution. For the Au 95 Ru 5 catalyst, chronoamperometric data at the potential step of −0.65 V (vs. Ag/AgCl,3 M KCl) exhibit a well linear dependence of the anodic oxidation current density on glucose concentration in the range of 0 to 15 mM glucose.