Showing papers by "Nathan S. Lewis published in 1981"

Electrochemical reduction of horse heart ferricytochrome c at chemically derivatized electrodes

Abstract: Platinum or gold electrodes derivatized with an N,N'-dialkyl-4,4'-bipyridinium reagent can be used to reduce horse heart ferricytochrome c, whereas reduction doses does not occur at the "naked" electrodes. From 3 to 17.7 millimoles per liter, the reduction of ferricytochrome c is mass transport-limited at electrode potentials more negative than about -0.6 volt against a saturated calomel reference electrode. Data for the photoreduction of ferricytochrome c at derivatized p-type silicon photocathodes show directly that the rate of reduction is mass transport-limited. Use of derivatized electrodes may allow convenient manipulation and analysis of biological molecules that do not ordinarily respond at conventional electrodes.

Fermi level pinning of p-type semiconducting indium phosphide contacting liquid electrolyte solutions: rationale for efficient photoelectrochemical energy conversion

Abstract: Data are reported that show that p-type InP gives a photovoltage E/sub V/, of approx. 0.8 V with respect to solution redox couples where the formal potential of the redox couple, E/sup 0/, can vary over a potential range that significantly exceeds the magnitude of the band gap, E/sub g/, of InP.

Redox mediation and hydrogen-generation with bipyridinium reagents

Abstract: A variety of redox mediating agents employing bipyridinium reagents and such reagents in conjunction with dispersed noble metals, such as platinium, are disclosed as coatings for substrates and electrodes. The agents may be charged by an applied voltage or by photoelectric effects or may be equilibrated with hydrogen. The agents are useful in reducing biological materials and electrolytic hydrogen production.