On the nature of the hydroxyl radicals produced at boron-doped diamond and Ebonex® anodes

Role of sp3/sp2 ratio on the electrocatalytic properties of boron-doped diamond electrodes: A mini review

“…These electrogenerated species are primordially physisorbed on the anode surface (non-active anode surface interacts so weakly with • OH), playing an important role in the electrochemical conversion/combustion of organic pollutants [4][5][6][7][8][9][10][11][12][13][14]. However, the non-active character of BDD electrode has been questioned by some authors [15,16] due to the different results (partial oxidation or complete mineralization) obtained during electrochemical oxidation (EO) of organic pollutants.…”

Mechanistic studies on boron-doped diamond: Oxidation of small organic molecules

“…The formation of hydroxyl radicals on BDD electrodes was confirmed by spintrapping experiments [8], coumarin oxidation [9], and a Tafel-slope of 120 mV/dec in the potential region above 2.4 V for the oxygen evolution reaction (OER) in perchloric acid [10] and for the oxidation of methanol and formic acid [11]. The oxidation of H 2 O 2 as well as carbon monoxide and small aliphatic organic molecules such as MeOH, EtOH, formic and acetic acid, was studied in order to clarify the oxidation processes on BDD electrodes in aqueous oxidation of water and primary, secondary, and tertiary alcohols in HFiP as a solvent, which on oxidation does not form OH radicals.…”

Development of a Three-Dimensional Structured Carbon Fiber Felt/β-PbO2 Electrode and Its Application in Chemical Oxygen Demand Determination

“…Several kinds of electrochemical sensors for the determination of COD, such as AgO/CuO [15], PbO 2 [13,16], Rh 2 O 3 /Ti [17], Cu/CuO [18] and boron-doped diamond (BDD) [3] electrodes, have been developed in recent years. However, the sensitivity and the linearity range for electrochemical COD determination are associated with the generation rate of the ·OH radicals and the total amount of active sites on anode, and are also affected by the substrate, the electrochemical active materials and the specific area of the electrodes [19][20][21][22].…”