Combinatorial electrochemistry: A highly parallel, optical screening method for discovery of better electrocatalysts

Science

Volumn 280, Issue 5370, 1998, Pages 1735-1737

  Reddington, Erik ^a   Sapienza, Anthony ^a   Gurau, Bogdan ^b   Viswanathan, Rameshkrishnan ^b   Sarangapani, S ^c   Smotkin, Eugene S ^b   Mallouk, Thomas E ^a  

^a PENNSYLVANIA STATE UNIVERSITY   (United States)

^b Illinois Institute of Technology   (United States)

^c ICET Inc   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ELECTROCHEMICAL ELECTRODES; ELECTROCHEMISTRY; HYDROGEN; IONS; METHANOL; OXIDATION;

COMBINATORIAL ELECTROCHEMISTRY; CURRENT VOLTAGE METHODS; ELECTROOXIDATION; OPTICAL SCREENING METHOD;

CATALYSTS;

CARBON; IRIDIUM; METAL; METHANOL; OSMIUM; PLATINUM; PROTON; RHODIUM; RUTHENIUM;

ARTICLE; CATALYST; ELECTROCHEMISTRY; OXIDATION; PRIORITY JOURNAL; SCREENING;

EID: 0032510984     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.280.5370.1735     Document Type: Article

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29. 4).
30. 4. The carbon substrate has a small resistance (1 to 3 ohms), which translates to a negligible potential drop at the screening currents used (about 1 mA). Bulk samples of catalysts were prepared by dissolving the appropriate metal salts in water to attain an overall concentration of 2 mM. The pH was adjusted to 9, and a 10-fold excess of 5 weight % sodium borohydride was added at one drop per minute. The black precipitate was washed 10 times with water and dried at 110°C. Fuel cell membrane-electrode assemblies were constructed from Nation 117 by preparing a suspension of the catalyst in 15 weight % soluble Nafion and painting the material onto a decal as described in detail in (22).
31. We thank A. Czarnik, D. L. Feldheim, R. Wodd, X.-D. Xiang, and P. G. Schultz for helpful discussions; Todd LaFrenz for performing BET measurements; and the Office of Naval Research (LBL Molecular Design Institute), the Defense Advanced Research Projects Agency, and the Army Research Office for financial support.