Fig. 2: Estimation of the QFL of holes on a Nb:TiO2 photoanode. | Nature Communications

Fig. 2: Estimation of the QFL of holes on a Nb:TiO2 photoanode.

From: Estimating the quasi-Fermi level of holes at the surface of semiconductor photoanodes using outer-sphere redox couples

Fig. 2

a I–t curves of chronopotentiometry (CP) for the Pt plate electrode at 1.0 mA to oxidize TEMPOL (black line) and the subsequent CA for the Ni wire electrode at −0.35 V vs. Fc+/Fc (green line). b I–t curves of CA for the Nb:TiO2 photoanode at −0.08 V vs. Fc+/Fc to oxidize TEMPOL (red line) and the subsequent CA for the Ni wire electrode at −0.35 V vs. Fc+/Fc (green line). CE: Pt wire; RE: Ag/Ag+ reference electrode; Electrolyte: ACN containing 20 mM TEMPOL and 100 mM TBAPF6; stirring rate: 700 rpm; light source: 370 nm LED light (68 mW cm–2). c Comparison of the results of the Pt plate electrode and the Nb:TiO2 photoanode. d FEs for the oxidation of the redox species on the Nb:TiO2 photoanode. e Estimation of the QFL of holes on the Nb:TiO2 photoanode during the redox couple oxidation. Source data are provided as a Source Data file.

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