Electrochemistry and photoelectrochemistry of pillared-clay-modified electrodes

Journal Article · Wed Apr 18 04:00:00 EDT 1990 · Inorganic Chemistry; (USA)

DOI:https://doi.org/10.1021/ic00333a018· OSTI ID:6729866

Rong, Daiting; Kim, Yeong Il; Mallouk, T E ^[1]

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1. Univ. of Texas, Austin (USA)

Clay-modified electrodes (CME) were made by binding Al{sub 13}O{sub 4}(OH){sub 28}{sup 3+}-pillared montmorillonite to SnO{sub 2} and Pt surfaces via a thin (2-4 monolayer thick) coating of polymerized silane. The polymer provides a binding site for multiply charged anions such as Fe(CN){sub 6}{sup 4{minus}} and Mo(CN){sub 8}{sup 4{minus}}, while the clay external surface strongly binds large cations such as Os(bpy){sub 3}{sup 2+} and Ru(bpy){sub 3}{sup 2+}. Charge-trapping behavior, which is a consequence of spatial ordering of the electroactive anions and cations, is observed in cyclic voltammetry of the CME in aqueous KH{sub 2}PO{sub 4} solution. With Ru(bpy){sub 3}{sup 2+} exchanged onto the clay surface, photocathodic currents are generated with a quantum efficiency (per photon absorbed) of ca. 1%. This photocurrent is attributed to electron donor quenching of the Ru(bpy){sub 3}{sup 2+} excited state by Fe(CN){sub 6}{sup 4{minus}} or Mo(CN){sub 8}{sup 4{minus}}. 22 refs., 6 figs.

• DOE Contract Number: FG05-87ER13789
• OSTI ID: 6729866
• Journal Information: Inorganic Chemistry; (USA), Journal Name: Inorganic Chemistry; (USA) Vol. 29:8; ISSN 0020-1669; ISSN INOCA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400* -- Electrochemistry
400500 -- Photochemistry
AZINES
BIPYRIDINES
CHEMISTRY
CLAYS
COMPLEXES
CURRENTS
DATA
ELECTRIC CURRENTS
ELECTROCHEMISTRY
ELECTRODES
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
INFORMATION
IRON COMPOUNDS
MOLYBDENUM COMPOUNDS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OSMIUM COMPLEXES
PHOTOCHEMISTRY
PHOTOCURRENTS
PYRIDINES
REFRACTORY METAL COMPOUNDS
RUTHENIUM COMPLEXES
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENT COMPOUNDS