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. 2018 Aug 24;6:358. doi: 10.3389/fchem.2018.00358

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Copyright © 2018 Chumillas, Maestro, Feliu and Climent.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Behavior of CueO on Au(111) (A,B,D) and Au(111) modified with 4-ATP (C,E) in an O₂ solution at different pHs values between 3 and 10. (A–C) Collect data for the ORR current density against the overpotential of the O₂ reduction. Scan rate: 20 mVs⁻¹. (D,E) show the pH dependence of the $E_{T 1 -}^{°}$ CueO on Au(111) (D) and Au(111) modified with 4-ATP (E). Black solid squares: Experimental values for the $E_{T 1 \approx}^{°}$ $E_{onset}^{°}$ . Red line: linear fit to the experimental data.