fig5

Figure 5. Asymmetric catalytic electrode pairs for the concerted H₂O₂ production: (A) Comparison of in-situ Raman spectra recorded at a roughened Pt electrode in 2 M K₂C¹⁶O₃-H₂¹⁶O and 2 M K₂C¹⁶O₃-H₂¹⁸O electrolyte; (B) Main reaction pathway for two-electron water oxidation to H₂O₂ in a high-concentration K₂CO₃ solution; (C) LSV plots for Pt electrode in 2 M K₂CO₃ electrolyte (pH = 12.1 ± 0.2). Inset is the corresponding FE of H₂O₂; (D) Schematic design of the flow cell coupling 2e^- WOR and 2e^- ORR for H₂O₂ production; (E) Cell voltage and H₂O₂ FE in the flow cell at a constant cell current of 150 mA; (A-E) are adapted with permission from^[119]. Copyright © 2024 Springer Nature; (F) XRD pattern of the CuWO₄/Sn catalyst; (G) HRTEM image of CuWO₄/Sn. (H) Selected area electron diffraction of CuWO₄/Sn; (I) FE of H₂O₂ for CC/CuWO₄/Sn and FTO/CuWO₄/Sn and H₂O₂ generation rate of CC/CuWO₄/Sn; (J) FE_cell of H₂O₂ generated from the cathode and anode operated at different current densities; (K) Structures of OH* absorbed on Sn-doped CuWO₄ with Sn inside (upper) and on the surface (lower); (F-K) are adapted with permission from^[120]. Copyright © 2022 American Chemical Society.