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A novel co-reactant-free electrogenerated chemiluminescence (ECL) system is developed where Ru(bpy) 3  2+ emission is obtained on boron-doped diamond (BDD) electrodes. The method exploits the unique ability of BDD to operate at very high oxidation potential in aqueous solutions and to promote the conversion of inert SO 4  2- into the reactive co-reactant S 2 O 8  2- . This novel procedure is rather straightforward, not requiring any particular electrode geometry, and since the co-reactant is only generated in situ, the interference with biological samples is minimized. The underlying mechanism is similar to that of the Ru(bpy) 3  2+ /S 2 O 8  2- system; however, the intensity of the emitted signal increases linearly with [SO 4  2- ] up to ∼0.6 M, with possible implications for analytical uses of the proposed procedure.

journal of the american chemical society

Co-reactant-on-Demand ECL: Electrogenerated Chemiluminescence by the in Situ Production of S2O82– at Boron-Doped Diamond Electrodes