Combinatorial Electrochemistry: A Highly Parallel, Optical Screening Method for Discovery of Better Electrocatalysts
- 12 June 1998
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 280 (5370), 1735-1737
- https://doi.org/10.1126/science.280.5370.1735
Abstract
Combinatorial screening of electrochemical catalysts by current-voltage methods can be unwieldy for large sample sizes. By converting the ions generated in an electrochemical half-cell reaction to a fluorescence signal, the most active compositions in a large electrode array have been identified. A fluorescent acid-base indicator was used to image high concentrations of hydrogen ions, which were generated in the electrooxidation of methanol. A 645-member electrode array containing five elements (platinum, ruthenium, osmium, iridium, and rhodium), 80 binary, 280 ternary, and 280 quaternary combinations was screened to identify the most active regions of phase space. Subsequent “zoom” screens pinpointed several very active compositions, some in ternary and quaternary regions that were bounded by rather inactive binaries. The best catalyst, platinum(44)/ruthenium(41)/osmium(10)/iridium(5) (numbers in parentheses are atomic percent), was significantly more active than platinum(50)/ruthenium(50) in a direct methanol fuel cell operating at 60°C, even though the latter catalyst had about twice the surface area of the former.This publication has 24 references indexed in Scilit:
- A Rare-Earth Phosphor Containing One-Dimensional Chains Identified Through Combinatorial MethodsScience, 1998
- Generating Sensor Diversity through Combinatorial Polymer SynthesisAnalytical Chemistry, 1997
- Methanol Oxidation on Single‐Phase Pt‐Ru‐Os Ternary AlloysJournal of the Electrochemical Society, 1997
- High-density oligonucleotide arraysBiosensors and Bioelectronics, 1996
- Ellipsometry and dems study of the electrooxidation of methanol at Pt and Ru- and Sn- promoted PtElectrochimica Acta, 1995
- A Transition State Analog Inhibitor Combinatorial LibraryJournal of the American Chemical Society, 1995
- Sequence-Selective Binding of Peptides in Water by a Synthetic Receptor MoleculeJournal of the American Chemical Society, 1995
- Aerial Oxidation of Some 2-Pyridyl Ketone Hydrazones Catalyzed by Cu2+. Physical Properties of Reaction Products.CHEMICAL & PHARMACEUTICAL BULLETIN, 1993
- A new type of synthetic peptide library for identifying ligand-binding activityNature, 1991
- The ?multiple-sample concept? in materials research: Synthesis, compositional analysis and testing of entire multicomponent systemsJournal of Materials Science, 1970